تعريف

خطر الإصابة بأمراض القلب والأوعية الدموية على مدى عشر سنوات هو احتمال محسوب - يُعبَّر عنه كنسبة مئوية - لتعرض الفرد لحدث قلبي وعائي رئيسي مثل النوبة القلبية أو السكتة الدماغية خلال العقد القادم، ويتم تقديره باستخدام معادلات معتمدة تأخذ في الاعتبار العمر، والجنس، وضغط الدم، والكوليسترول، وحالة مرض السكري، والتدخين؛ وتحتفظ الإرشادات الحالية بالنظر في استخدام الأسبرين للوقاية الأولية للبالغين…

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هذا الرقم هو الحد الفاصل الأساسي الذي يستخدمه الأطباء لتحديد ما إذا كانت فوائد الأسبرين ترجح على الأرجح مخاطر النزيف لدى شخص لم يسبق له الإصابة بأمراض القلب.

تعريف

إنزيم 11β-HSD1 هو إنزيم يتم التعبير عنه في الأنسجة الدهنية، يقوم بتحويل الكورتيزون غير النشط إلى كورتيزول نشط محلياً، مما يؤدي إلى تضخيم إشارات الجلوكوكورتيكويد داخل مستودعات الدهون؛ إن تعبيره النسبي الأعلى في الدهون الحشوية مقارنة بالدهون تحت الجلد قد يخلق بيئة على مستوى الأنسجة تعزز تخزين الدهون والخلل الاستقلابي الذي يشبه متلازمة كوشينغ الخفيفة.

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يربط هذا الإنزيم بين الإجهاد المزمن وتراكم الدهون الحشوية على المستوى الجزيئي، بشكل مستقل عن إجمالي الكورتيزول في مجرى الدم.

تعريف

مخطط كهربية القلب القياسي الذي يسجل النشاط الكهربي للقلب في وقت واحد من اثني عشر موضعاً للأقطاب الكهربائية توضع على الأطراف والصدر؛ وعند إجرائه أثناء التمرين الأقصى، يمكن أن يكشف عن تغيرات نقص التروية — مثل انخفاض قطعة ST — التي تكون غير مرئية أثناء الراحة.

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فهم سبب قدرة تخطيط القلب في الراحة على تفويت الانسدادات الكبيرة يوضح سبب أهمية اختبار الجهد بأقصى جهد للرياضيين.

تعريف

الشكل الأقوى والأكثر نشاطاً بيولوجياً للإستروجين، والذي تنتجه في الغالب بصيلات المبيض خلال سنوات الإنجاب؛ وهو يعمل على مستقبلات الإستروجين في جميع أنحاء الدماغ والجسم لتنظيم استقلاب الجلوكوز، والوظيفة المشبكية، والمزاج، والتبرعم الوعائي، وينخفض بشكل حاد خلال مرحلة الانتقال إلى سن اليأس.

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إن فهم الإستروجين المحدد المعني يساعد في تفسير سبب تأثير انقطاع الطمث بشكل عميق على الدماغ والقلب، وسبب عدم إمكانية تبديل تركيزات العلاج الهرموني ببعضها البعض.

تعريف

إرشاد رئيسي للممارسة السريرية في الولايات المتحدة لإدارة الكوليسترول في الدم والذي دمج حساب نقاط الكالسيوم التاجي (CAC) كمساعد لاتخاذ القرار؛ وهو يوصي بأن يُؤجّل علاج الستاتين لدى الأفراد عديمي الأعراض ذوي الخطر المتوسط الذين لديهم نقاط كالسيوم تاجي تساوي صفراً، ما لم يكن مرض السكري، أو التدخين النشط، أو التاريخ العائلي القوي للإصابة المبكرة بأمراض القلب والأوعية الدموية موجوداً.

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هذا الإرشادات هي المرجع الأساسي لممارسة السريرية المتمثلة في استخدام درجة تستاج الشريان التاجي الصفرية لتأخير أو تجنب وصف الستاتين.

تعريف

إرشادات ممارسة سريرية مشتركة من الكلية الأمريكية لأرض الأمراض القلبية وتجمع القلب الأمريكي تغطي استراتيجيات الوقاية من أول حدث قلبي وعائي، بما في ذلك التوصيات حول الاستخدام المناسب والقيود الخاصة بحاسبات المخاطر القياسية وأدوات التصوير في الوقاية الأولية.

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تُشكّل هذه الإرشادات ما يُنصح الأطباء بالقيام به — وما لا يُنصحون به — في الفحوصات القلبية الروتينية، ولهذا السبب فإن فهم نطاقها يساعد المرضى على طرح أسئلة أفضل حول ما إذا كان التقييم الإضافي مبرراً.

تعريف

إرشادات جمعية أطباء القلب الأوروبية لأمراض القلب الرياضية لعام 2020 هي وثيقة قائمة على الأدلة الصادرة عن جمعية أطباء القلب الأوروبية، والتي تقدم توصيات بشأن الفحص القلب والأوعية الدموية، وتقسيم المخاطر، وقرارات العودة إلى ممارسة الرياضة للرياضيين التنافسيين والترفيهيين، بما في ذلك الرياضيون المخضرمون الذين يعانون من اشتباه أو تأكيد الإصابة بأمراض القلب.

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يُححدد المعيار السريري الحالي لكيفية تقييم الأطباء للرياضيين الأكبر سناً الذين قد يخفون أمراض القلب والأوعية الدموية وراء لياقتهم البدنية العالية.

تعريف

معايير المعهد الوطني للشيخوخة وجمعية مرض الزهايمر المحدثة لعام 2024 هي إرشادات تشخيصية صادرة عن المعهد الوطني للشيخوخة وجمعية مرض الزهايمر، والتي تعرّف مرض الزهايمر بيولوجياً من خلال وجود المؤشرات الحيوية الأساسية للأميلويد والتاو، بشكل مستقل عن الأعراض السريرية.

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يتفاعل المقال بشكل صريح مع هذه المعايير للقول بأن تحديد مرض الزهايمر من خلال بصمة المؤشرات الحيوية اللاحقة يتوافق مع كون أمراض الأوعية الدموية سبباً سابقاً لتلك البصمة.

تعريف

الهيدروكسي كوليسترول-24 هو أكسيكوليسترول يُنتج في الدماغ عن طريق التحويل الأنزيمي للكوليسترول، مما يمكنه من عبور حاجز الدم في الدماغ والتخلص منه في مجرى الدم - وهو مسار الخروج الأساسي لكوليسترول الدماغ.

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وهو الناتج الثانوي القابض للقياس لعملية استقلاب الكولسترول في الدماغ ومؤشر حيوي محتمل لعملية استقلاب الكولسترول في الجهاز العصبي المركزي.

تعريف

الشكل النشط بيولوجياً للفولات الذي يتدفق في الدم ويعمل كمستقبل لمجموعة الميثيل في عملية إعادة ميثيل الهوموسيستين ليتحول إلى ميثيونين؛ وهو الشكل الذي يستخدمه إنزيم ميثيونين سينثاس ويباع في المكملات الغذائية تحت اسم 'إل-ميثيل فولات'.'

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فهم أن هذا هو الشكل النشط للفولات يساعد في تفسير سبب وجوب تحويل حمض الفوليك القياسي بواسطة الجسم قبل أن يتمكن من خفض الهوموسيستين.

تعريف

نظام تصوير مقطعي محوسب متطور يتميز بكاشف عريض بدرجة كافية (160 مم) لالتقاط القلب بأكمله في دورة واحدة ونبضة قلب واحدة، مما يلغي عيوب دمج الصور التي تنشأ مع الكواشف الأضيق ويمكن من خفض جرعات الإشعاع إلى أقل من ميلي سيفرت واحد.

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تجادل المقالة بأن هذه التقنية تجعل تتبع اللويحات على المدى الطويل أكثر أماناً وأكثر عملية، مما يدعم دورها المحتمل في أمراض القلب الوقائية الروتينية.

تعريف

تتشير استجابة مستقبلات بيتا الأدرينالية إلى حساسية القلب للتحفيز بواسطة الأدرينالين وهرمونات التوتر ذات الصلة عبر مستقبلات بيتا الأدرينالية؛ ويؤدي التقدم في السن إلى تقليل هذه الحساسية، مما يحد من سرعة وقوة استجابة القلب أثناء ذروة التمرين حتى لدى الأفراد المدربين جيداً.

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إن انخفاض حساسية مستقبلات بيتا هو أحد الأسباب التي تجعل الحد الأقصى لمعدل ضربات القلب ينخفض مع التقدم في العمر بغض النظر عن مستوى اللياقة البدنية، مما يضع سقفاً بيولوجياً على الأداء الرياضي.

تعريف

الجسم الكيتوني الأساسي المنتج أثناء استقلاب الدهون؛ ويُستخدم تركيزه في الدم كعلامة حيوية رئيسية للحالة الكيتونية، سواء كانت ناجمة عن الصيام، أو اتباع نظام غذائي منخفض جداً في الكربوهيدرات، أو تناول مكملات الكيتون الخارجية.

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فهم (بيتا-هيدروكسي بروتيرات) يوضح المعنى الكيميائي الحقيقي لـ 'وجود الجسم في الحالة الكيتونية'، وهو أمر ضروري لتقييم الادعاءات الصحية المتعلقة بالنظام الكيتوني.

تعريف

غاما-بوتيروبيتين (γBB) هو وسيط استقلابي رئيسي يتشكل في الأمعاء القريبة عندما تبدأ البكتيريا في معالجة L-كارنيтин الغذائي؛ ويتراكم بمعدل أعلى بنحو 1,000 مرة من تكوين TMA المباشر، ويعمل بمثابة خزان يحافظ على إنتاج TMA و TMAO لفترة طويلة بعد هضم وجبة تحتوي على اللحوم.

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يُفسر مخزون غاما-بي بي بي سبب عدم قدرة تغيير غذائي واحد على خفض مستويات ثلاثي ميثيل أمين-إن-أكسيد (TMAO) لديك بسرعة، فالأمعاء تمتلك مخزوناً كبيراً تعتمد عليه.

تعريف

بروتين ABCA1 هو بروتين ضخ الكوليسترول خارج الخلايا وتسليمه إلى جسيمات البروتين الدهني عالي الكثافة (HDL) في رحلة العودة إلى الكبد.

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إنها الخطوة الأولى في عملية النقل العكسي للكوليسترول. الأشخاص الذين لديهم نسختان معطلتان يصابون بمرض تانجر، مع عدم وجود تقريباً أي بروتين دهني مرتفع الكثافة (HDL) على الإطلاق - وهي تجربة طبيعية لما يفعله HDL بالفعل.

تعريف

بروتينات غشائية في خلايا الرغوية البلعمية تصدر الكوليسترول داخل الخلية إلى مستقبلات خارج الخلايا مثل بروتين الصميم الشحمي أ-1 والبروتين الدهني عالي الكثافة؛ ويعد تنشيطها أثناء خفض الدهون خطوة رئيسية في انحسار اللويحات، مما يسمح للخلايا المحملة بالدهون بالتخلص من عبء الكوليسترول لديها.

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إنها 'مخارج' جزيئية تسمح بإزالة الكوليسترول المحبوس داخل خلايا جدار الشريان، وفهمها يوضح كيف تعمل العلاجات الخفضة للدهون على المستوى الخلوي.

تعريف

تمدد الأوعية الدموية الأبهرية البطنية هو توسع في الشهر الأبهر (الوريد الأبهر) في البطن ناجم بشكل أساسي عن الالتهاب المزمن، والعبء تصلب الشرايين، وسلسلة حالّة للبروتين غير مضبوطة تقوم فيها بروتينات مصفوفة الميتالوبروتينيز بتدمير هيكل الإيلاستين والكولاجين في جدار الوعاء.

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يتشارك تمدد الأوعية الدموية الأبهرية البطنية (AAA) في السبب الجذري مع مرض الشريان التاجي والمحيطي، مما يجعله خطراً صاقاً لأي شخص يدير بالفعل عوامل الخطر القلبية الوعائية.

تعريف

مرض Abetalipoproteinemia هو اضطراب وراثي صبغي جسدي متنحي نادر ناجم عن طفرات تفقد الوظيفة في جين MTTP، وهو مطلوب لتجميع وإفراز البروتينات الدهنية التي تحتوي على ApoB؛ الأفراد المصابون لديهم غياب شبه تام لجزيئات ApoB الدائرية، مع إجمالي الكوليسترول الذي يكون عادةً أقل من 30 ملغ / ديسيلتر وLDL-C الذي غالباً ما يكون غير قابل للاكتشاف. على الرغم من المضاعفات الخطيرة غير القلبية (سوء امتصاص الدهون…

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إنه أقرب دليل في العالم الحقيقي على أنه بدون الجسيمات التي تحتوي على الأبوبروتين بي (ApoB)، فإن تصلب الشرايين لا يحدث أساساً.

تعريف

الخطر المطلق هو الاحتمال الحقيقي لحدوث أمر ما لك، مُعبَّراً عنه كنسبة مئوية. إذا كان خطر إصابتك بنوبة قلبية في السنوات العشر القادمة يبلغ 12 بالمئة، فهذا يعني أن حوالي 12 شخصاً من كل 100 شخص مثلك سيصابون بها.

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هذا يختلف عن الخطر النسبي، الذي يقارن بين مجموعتين فقط. الدواء الذي يقلل الخطر بنسبة 25 بالمائة يبدو هائلاً، ولكن إذا كان خطر البداية ضئيلاً، تكون الفائدة في الواقع ضئيلة أيضاً. اسأل دائماً عن الرقم المطلق.

تعريف

معادلات الكورت المُجمّعة الصادرة عن الكلية الأمريكية لأرض الأمراض القلبية وجمعية القلب الأمريكية (ACC/AHA) هي مجموعة من حاسبات المخاطر القلبية الوعائية التي طورها بشكل مشترك كل من الكلية الأمريكية لأرض الأمراض القلبية وجمعية القلب الأمريكية، والتي تم تقديمها في عام 2013، والتي تقرّر تقدير خطر الإصابة بحدث قلبي وعائي تصلبي عصيدي أول خلال عشر سنوات باستخدام العمر، والجنس، والعرق، ومستوى الكوليسترول، ضغط الدم، والسكري، وحالة التدخين.

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إنها حاسبات المخاطر الأكثر استخداماً على نطاق واسع في الولايات المتحدة وغالباً ما تحدد من يُعرض عليه علاج الستاتين - وفهم قيودها يفسر سبب الحاجة أحياناً إلى اختبارات إضافية.

تعريف

أظهرت تجربة عشوائية واسعة النطاق لدواء إيفاسيترابيب، والتي أدت إلى رفع الكوليسترول المرتبط بالبروتينات الدهنية عالية الكثافة (HDL) بشكل كبير وخفض الكوليسترول المرتبط بالبروتينات الدهنية منخفضة الكثافة (LDL)، عجزها عن الحد من النتائج القلبية الوعائية لدى المرضى المعرضين لمخاطر عالية، مما يدعم بشكل أكبر الرأي القائل بأن كوليسترول البروتين الدهني عالي الكثافة (HDL-C) هو مجرد مؤشر وليس عاملاً وقائياً مسبباً.

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يعزز سبب عدم اعتبار تأثير زيت الكوبرا (أو زيت جوز الهند) المرفع للكوليسترول النافع فائدة قلبية وعائية ذات معنى.

تعريف

كانت دراسة ACCORD تجربة واسعة النطاق لاختبار ما إذا كان خفض نسبة السكر في الدم بشكل عدواني للغاية لدى المصابين بداء السكري من النوع الثاني من شأنه أن يمنع النوبات القلبية.

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لم يحدث ذلك، وكانت حالات الوفاة أكثر في مجموعة العلاج المكثف. وكان الدرس المستفاد هو أن خفض الرقم لا يعني بالضرورة مساعدة المريض - وهو موضوع يتكرر طوال علم أمراض القلب.

تعريف

مثبط الإنزيم المحول للأنجيوتنسين (ACE) هو فئة من الأدوية التي تخفض ضغط الدم وتقلل من عبء عمل القلب عن طريق حظر (منع) الإنزيم الذي يضييق الأوعية الدموية. أصبحت مثبطات الإنزيم المحول للأنجيوتنسين جزءاً من الرعاية القياسية بعد الإصابة بالنوبة القلبية وهي من بين العلاجات التي يذكر المقال أنها وصلت بعد أن بدأ الانخفاض الأولي في معدل وفيات الشريان التاجي بالفعل.

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توضح مثبطات الإنزيم المحول للأنجيوتنسين كيف يمكن للأدوية الفعالة تحسين البقاء على قيد الحياة ومنع تكرار المرض حتى بعد الإصابة بنوبة قلبية، مما يمثل مرحلة 'التعزيز الدوائي' للتراجع.

تعريف

الحُقّ: التجويف الشكلي الكؤوسي في الحوض الذي يستقر فيه رأس عظم الفخذ، محققاً مفصل الورك؛ وإنَّ كسر الحُقّ يُعطّل هذا المفصل ويمكن أن يحدَّ بشدة من القدرة على تحمل الوزن وظيفة الطرف السفلي أثناء التعافي.

لماذا يُعد ذلك مهمًا

تحمل كسور الورك وإصابات الحوض دلالات كبيرة لإعادة التأهيل القلب الوعائي، لا سيما لدى الرياضيين الأكبر سنًا الذين يحاولون الحفاظ على لياقتهم البدنية.

تعريف

مروسط شديد التفاعل وساُم ينتج عندما يقوم إنزيم "ألكهول ديهايدروجينيز" بتكسير الكحول في الكبد؛ فالأسيتالديهيد يعزز الإجهاد التأكسدي، ويدمر الوصلات الخلوية، وله تأثيرات سامة مباشرة على القلب، لا سيما لدى الأفراد الذين يعانون من ضعف في نشاط إنزيم "ألدهيد ديهايدروجينيز".

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إنه الجاني السام الرئيسي المسؤول عن الضرر المباشر الذي يلحقه الكحول بخلايا عضلة القلب.

تعريف

متلازمة الشريان التاجي الحادة (ACS) هي مصطلح شامل لأي انخفاض مفاجئ في تدفق الدم إلى القلب - بدءاً من الذنب الصدري غير المستقر وصولاً إلى النوبة القلبية الكاملة - والذي ينجم عن تمزق أو تآكل مفاجئ في اللويحة.

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يعتمد التشخيص الدقيق على اختبارات الدم وتخطيط القلب (الكهربائي)، لكن الحدث الأساسي هو نفسه: صفيحة دهنية كانت مستقرة بهدوء في جدار الشريان تنفتح وتتمزق. ولهذا السبب فإن ألم الصدر الجديد أو المتفاقم يحتاج إلى تقييم في نفس اليوم، وليس إلى نهج الانتظار والمراقبة.

تعريف

إنزيم معدني بروتيني يقطع النطاق الخارجي للمستقبلات المرتبطة بالغشاء، محولاً إياها إلى أشكال جارية قابلة للذوبان؛ وفي سياق إشارات الإنترلوكين-6 (IL-6)، يقوم ADAM17 بقطع مستقبل الإنترلوكين-6 المرتبط بالغشاء (mIL-6R) لتوليد الشكل القابل للذوبان (sIL-6R) الذي يتيح إشارات عبورية أوسع نطاقاً مساعدة على الالتهاب في جميع أنحاء الجسم.

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يحدد نشاط بروتين ADAM17 مقدار إشارات الإنترلوكين-6 (IL-6) التي تصل إلى جدار الأوعية الدموية، وهي خطوة رئيسية في تحديد ما إذا كانت ترسبات الدهون تتطور إلى لويحات خطيرة.

تعريف

كانت دراسة ADAPTABLE تجربة عشوائية عملية شملت 15,076 مريضاً مصاباً بمرض القلب والأوعية الدموية تصلب الشرايين المؤكد، وقارنت بين جرعة 81 ملغ مقابل 325 ملغ من الأسبرين يومياً؛ ولم تجد فرقاً كبيراً في النتائج القلبية الوعائية أو النزيف الرئيسي بين الجرعتين، مما يدعم 81 ملغ جرعة الصيانة المفضلة.

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إنه أكبر مقارنة مباشرة وجهاً لوجه بين أكثر جرعتين شيوعاً من الأسبرين، مما يحدد بشكل مباشر الجرعة التي يجب أن يختارها المرضى والأطباء.

تعريف

التخانة البطانية التكيفية هي زيادة بؤرية طبيعية وغير مرضيّة في الطبقة الشريانية الداخلية الأكثر عمقاً، وتحدث عند الانحناءات ونقاط التفرع استجابة لاضطراب تدفق الدم؛ وتتميز بوجود خلايا عضلية ملساء في مصفوفة من البروتيوغليكان والكولاجين، وعلى عكس الآفات تصلب الشرايين، فإنها لا تتضمن تراكم الدهون أو ارتشاح الخلايا الرغوية الالتهابية.

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فهم هذا التمييز يساعد في توضيح سبب عدم كون كل ثخانة في جدار الشريان مرضاً؛ فقد أدى تصنيفها بشكل خاطئ على أنها تصلب شرايين تاريخياً إلى تضخيم تقديرات انتشار المرض.

تعريف

السكريات المضافة هي السكريات التي توضع في الطعام أثناء تصنيع أو طهي الطعام، وليست السكريات الموجودة بشكل طبيعي في الفاكهة أو الحليب.

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الإفراط في السكر المضاف يمكن أن يرفع الثلاثي الغليسريد، ويزيد من دهون الجسم حول منطقة الوسط، ويدفع الجسم نحو مقاومة الإنسولين. وكل هذه العوامل الثلاثة تجعل الإصابة بأمراض القلب أكثر ترجيحاً.

تعريف

الجين الترميزي لكحول ديهايدروجينيز 1B، وهو الإنزيم المسؤول عن الخطوة الأولى في استقلاب الإيثانول؛ المتغيرات الجينية في ADH1B (لا سيما rs1229984) تؤثر على سرعة تفكك الكحول وتُستخدم بشكل شائع كمتغيرات أداة في دراسات الترافق المندلي للكحول والخطر القلب الوعائي.

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يُتيح استخدامه في التوزيع العشوائي Менدلي (أو المندلي) للباحثين دراسة تأثيرات الكحول دون متغيرات نمط الحياة المُربِكة التي ابتليت بها الدراسات الرصدية.

تعريف

الالتزام يعني في الواقع تناول دواتك بالطريقة التي وصف بها، يوماً بعد يوم.

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هذا أمر يoهم أكثر مما يدرك معظم الناس. تعمل أدوية الكوليسترول عن طريق خفض عدد الجسيمات لديك على مدار سنوات عديدة. تفويت الجرعات لا يقلل الفائدة قليلاً فحسب، بل يمكن أن يمحو معظمها، لأن الحماية تأتي من التعرض الإجمالي بمرور الوقت.

تعريف

Adipokines هي جزيئات نشطة بيولوجياً - بما في ذلك اللبتين، والأديبونكتين، وعامل نخر الورم ألفا (TNF-α)، والإنترلوكين-6 (IL-6) - تفرزها خلايا الدهون وتعمل كهرمونات أو بروتينات إشارية لتنظيم الأيض، وحساسية الأنسولين، والالتهاب، وتوازن الطاقة في جميع أنحاء الجسم.

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تساعد معرفة أن الأنسجة الدهنية تتواصل كيميائياً مع الأعضاء الأخرى في تفسير كيف يمكن للدهون الحشوية الزائدة أن تحفز أمراضاً جهازية بعيداً عن البطن.

تعريف

أديبونيكتين هو مركب أديبوكين يعزز حساسية الأنسولين ويحفز أكسدة الأحماض الدهنية عبر تنشيط إنزيم AMPK؛ وتنخفض مستوياته في الدورة الدموية مع تراكم الدهون الحشوية، مما يجعل انخفاضه مؤشراً مبكراً للخطر القلبية الوعائية والاستقلابية.

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توفّر مستويات الأديبونيكدين نافذةً على الصحة الأيضية تغفلها قياسات وزن الجسم تماماً.

تعريف

التحكيم هو العملية التي تقوم فيها لجنة مستقلة بمراجعة كل حدث تم الإبلاغ عنه في التجربة وتحديد ما حدث بالفعل، دون معرفة العلاج الذي تلقاه المريض.

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إنه يمنع الحماس من التأثير على النتائج. يجب ألا تعتمد ما إذا كانت زيارة المستشفيات تُحتسب كأزمة قلبيّة على الذراع التي كان فيها المريض ضمن التجربة.

تعريف

المواد السكرية المتقدمة (AGEs) هي مركبات تتكون عندما تتعرض البروتينات أو الدهون للسكريات أو لدرجات حرارة الطهي العالية؛ وفي اللحوم المطبوخة على حرارة عالية، ترتبط بمستقبل يُسمى RAGE على خلايا الأوعية الدموية، مما يؤدي إلى تحفيز سلسلة من الالتهابات. تُدرجها المقالة كواحدة من عدة مكونات في اللحوم الحمراء - إلى جانب الدهون المشبعة والحديد الهيمي - التي قد تضر بصحة القلب والأوعية الدموية بشكل مستقل عن مركب TMAO.

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They illustrate why isolating TMAO as 'the' harmful ingredient in red meat oversimplifies a complex dietary picture.

تعريف

A series of long-running prospective cohort studies examining health outcomes in Seventh-day Adventists, a population with high rates of vegetarianism; findings include a 62% lower risk of type 2 diabetes in vegans compared to non-vegetarians, independent of body weight.

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These studies provide some of the strongest epidemiological evidence linking plant-based diets to reduced chronic disease risk.

تعريف

A large prospective cohort study of approximately 96,000 Seventh-day Adventists in North America, valued in nutritional epidemiology because low rates of smoking and alcohol use in this population reduce major behavioral confounders, allowing cleaner assessment of dietary patterns on mortality and disease outcomes.

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Much of the evidence cited for vegetarian longevity benefits comes directly from this cohort, so knowing what it is helps you judge the quality of those claims.

تعريف

The adventitia is the tough outermost layer of an artery, made largely of connective tissue, nerves, and the small vessels that feed the wall.

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It was long treated as packaging. It is now understood to take an active part in inflammation and in how an artery reshapes itself as plaque grows.

تعريف

An exercise effort sustained entirely through oxidative metabolism, relying on a continuous supply of oxygen to produce ATP; the cycling hour record is classified this way because any significant shift to anaerobic pathways rapidly depletes energy reserves and impairs performance.

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Aerobic capacity is a core measure of cardiovascular health and a predictor of long-term heart disease outcomes.

تعريف

التمرين الهوائي هو نشاط منتظم يجعل تنفسك أسرع لفترة من الوقت، مثل المشي السريع، أو ركوب الدراجات، أو السباحة، أو الجري الخفيف.

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It improves fitness, blood pressure, blood sugar, and how well your blood vessels work. It is one of the best things you can do for your health. But it does not lower your ApoB particle count very much, which is why very fit people can still have plaque.

تعريف

The metabolic process by which cells, including neurons, break down glucose in the presence of oxygen to generate ATP energy; estrogen promotes this efficient pathway in the brain, and its decline during menopause can force the brain toward less efficient fuel sources.

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This is the specific energy mechanism the brain loses when estrogen drops, making it central to understanding menopausal brain fog.

تعريف

A structured exercise method alternating short bouts of high-intensity effort with active recovery periods — for example, four minutes at near-maximal exertion followed by three minutes easy — shown in clinical studies to reduce AF burden and improve VO₂ max more effectively than continuous steady-state training.

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AIT is the exercise prescription of choice for treated AF patients because it maintains fitness while avoiding the chronic volume strain that drives further atrial scarring.

تعريف

The resistive force exerted by air on a moving object; at altitude, lower air density reduces aerodynamic drag, which is why velodrome records are frequently set at high-elevation tracks despite the reduced oxygen availability.

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It explains the strategic choice of Aguascalientes for the attempt—less drag means higher speeds for the same power output.

تعريف

A specialist who analyzes and optimizes the drag profile of an athlete and their equipment—including body position, helmet, skinsuit, and wheels—to minimize air resistance and maximize speed at a given power output.

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In a one-hour time trial, aerodynamic drag is often the single largest determinant of distance covered, making this role central to record attempts.

تعريف

A measure of how much of the time a person is in atrial fibrillation, expressed as a percentage or total duration over a monitoring period; catheter ablation aims to reduce AF burden even when it does not eliminate AF entirely.

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Helps readers understand that ablation success is often partial rather than absolute.

تعريف

The return of atrial fibrillation after a period of successful rhythm control, whether achieved by ablation or medication; in endurance athletes, recurrence rates after a single ablation are approximately 40%, and persistent atrial enlargement and fibrosis are the main predictors.

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Recurrence risk is the central clinical question the article addresses for athletes considering ablation.

تعريف

نقاط أغاتستون هي المعادلة المحددة المستخدمة لتحويل التصوير المقطعي المحوسب للكالسيوم إلى رقم واحد، حيث يتم ترجيح كل ترسب للكالسيوم حسب كثافته وحجمه.

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When someone says "my calcium score is 150," this is the scale they mean. Because it weights density, two people with similar amounts of calcium can score differently.

تعريف

Agatston units are the standardized scoring units used to quantify coronary artery calcium on a CT scan, calculated from the density and area of calcified lesions; a score of zero indicates no detectable calcified plaque, while scores of 300 or above — found exclusively in the athlete group in the UK Masters study — reflect heavy calcification.

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They are the universal currency for reporting calcium scan results, so understanding the scale helps you interpret what your own score means.

تعريف

Age-adjusted mortality is a death rate that has been statistically corrected so that differences in the age structure of populations — or of the same population over time — do not distort comparisons. It answers the question: would the death rate have changed if the age mix had stayed constant?

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Because heart-attack deaths are far more common in older people, comparing raw death counts across decades is misleading without this adjustment — it is the basis for the article's claim of an 81% decline.

تعريف

A standardized supplement produced by prolonged cold aging of raw garlic, which concentrates water-soluble organosulfur compounds; randomized CT imaging trials have shown it can reduce low-attenuation (soft, rupture-prone) coronary plaque in patients with metabolic syndrome.

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AGE currently has stronger direct plaque-imaging evidence in humans than nattokinase, making it a useful comparison point for anyone evaluating supplement options.

تعريف

In the context of atherosclerosis, aggregation refers to the clumping together of ApoB-containing lipoprotein particles after they have been retained by proteoglycans in the artery wall, a step that triggers macrophage engulfment and foam-cell formation.

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Understanding aggregation shifts the explanation of plaque-building from simple 'oxidised fat' to a more evidence-supported retention-and-clumping mechanism.

تعريف

AI-QCT is an advanced coronary CT analysis technique that uses artificial intelligence to quantify and characterize plaque components—including non-calcified and low-attenuation plaques—beyond what a standard CAC score can detect.

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It explains the 'super-scan' technology that can find dangerous soft plaque even when a CAC score reads zero.

تعريف

A randomized trial that added extended-release niacin to intensive statin therapy in patients with established cardiovascular disease; despite raising HDL-C, niacin provided no reduction in cardiovascular events, contributing to evidence that HDL-C elevation is not causally cardioprotective.

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Another piece of evidence that coconut oil's HDL-raising property should not be interpreted as heart protection.

تعريف

Air density is the mass of air per unit volume; at high altitude or elevated temperature, air is less dense, which reduces the aerodynamic drag a cyclist must overcome and allows a higher speed for the same power output.

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Lower aerodynamic drag at altitude is one reason high-altitude velodromes are favoured for record attempts, illustrating how environmental physics interact with cardiovascular output.

تعريف

الكحول هو المكون الموجود في الجبيرة والنبيذ والمشروبات الروحية الذي يجعلها مسكرة.

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For years people were told a daily glass of wine was good for the heart. Newer and better studies have taken that idea apart. The people who drank lightly were healthier for other reasons. Alcohol raises blood pressure and triglycerides, and there is no amount that doctors recommend for heart protection.

تعريف

اعتلال عضلة القلب الكحولي هو شكل من أشكال اعتلال عضلة القلب المتوسع الناجم عن تعاطي الكحول المزمن بكثافة - والذي يُعرّف عادةً بحوالي 80 جراماً من الإيثانول يومياً لمدة خمس سنوات على الأقل - حيث تؤدي سمية الإيثانول المستمرة إلى إضعاف عضلة القلب وتضخمها؛ وعلى عكس العديد من أسباب قصور القلب، غالباً ما يكون اعتلال عضلة القلب الكحولي قابلاً للانعكاس بدرجة كبيرة مع الامتناع المستمر عن الكحول.

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Its reversibility upon stopping alcohol offers a rare example of meaningful heart-function recovery through lifestyle change alone.

تعريف

الجين الذي يرمز لألدهيد ديهيدروجيناز 2، والذي يحول الأسيتالديهيد -وهو نيتابوليت سام للإيثانول- إلى خلات غير ضارة؛ الأفراد الذين يحملون البديل ALDH2*2، الشائع بين شعوب شرق آسيا، لديهم نشاط إنزيمي ضعيف، مما يؤدي إلى تراكم الأسيتالديهيد، ومتلازمة الاحمرار، وزيادة خطر سمية القلب عند الشرب.

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This variant illustrates how genetics shapes individual vulnerability to alcohol-related heart harm.

تعريف

أليροكوماب، الذي يُباع تحت اسم برالونت، هو جسم مضاد حقني يمنع PCSK9، ويُعطى كل أسبوعين إلى أربعة أسابيع.

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It lowers LDL and ApoB by roughly half on top of a statin, and reduced repeat events in patients recovering from a heart attack.

تعريف

Activin receptor-like kinase 1 is an endothelial receptor implicated, alongside SR-B1, in the receptor-mediated transcytosis of apoB-containing lipoprotein particles across the endothelial barrier into the arterial intima, a concentration-dependent process that represents an early step in atherogenesis.

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It identifies a specific biological gateway through which circulating particles enter the artery wall, reinforcing why particle concentration over time matters.

تعريف

معدل الوفيات الإجمالي يعني الموت بسبب أي سبب كان، وليس فقط أمراض القلب - وهي النتيجة الأوسع نطاقاً والأصعب في التلاعب بها والتي يمكن لأي دراسة قياسها.

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Some treatments improve a narrow cardiovascular number while doing nothing for, or even worsening, your overall odds of dying from anything else. A trial that moves all-cause mortality carries more weight than one that only reports a cardiovascular-specific endpoint.

تعريف

Alpha-linolenic acid (ALA, 18:3n-3) is a plant-derived omega-3 polyunsaturated fatty acid found notably in canola oil and flaxseed; it is chemically distinct from the omega-6 linoleic acid that dominates most other seed oils, which is why canola oil is not considered interchangeable with high-linoleic oils.

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Grouping canola with other seed oils without acknowledging its omega-3 content distorts the nutritional comparison.

تعريف

A prescribing strategy in which a statin is taken every other day rather than daily, used clinically to reduce muscle symptoms in intolerant patients while preserving a meaningful portion of LDL-lowering effect, particularly with longer-half-life statins.

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A practical flexibility option athletes can discuss with their clinician when daily statin use causes symptoms.

تعريف

A sealed sleeping enclosure that simulates the reduced oxygen levels found at high altitude by lowering the partial pressure of oxygen inside; athletes use it to stimulate red blood cell production and improve oxygen-carrying capacity without relocating permanently to altitude.

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Improved oxygen delivery directly affects cardiovascular efficiency and endurance performance, making altitude simulation a practical training tool for heart-healthy athletes.

تعريف

A performance strategy in which endurance athletes train at elevation — in this case the Bicentenario Velodrome in Aguascalientes, Mexico, at roughly 1,800 m above sea level — to stimulate adaptations such as increased red blood cell production that enhance oxygen delivery.

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Altitude physiology is relevant to understanding how even elite, highly trained athletes can harbor undetected coronary artery disease.

تعريف

Competing or training at elevation—such as the Bicentenario Velodrome in Aguascalientes at roughly 6,000 feet—where thinner air reduces aerodynamic drag, allowing cyclists to travel farther in an hour than at sea level, but also causing faster fatigue due to lower oxygen availability.

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Megdal chose a high-altitude venue specifically to exploit reduced air resistance, while managing the physiological cost of racing at elevation.

تعريف

An Alu element is a type of short, repetitive 'jumping gene' abundant in primate genomes that can insert itself into new genomic locations; the insertion of an Alu element into the CMAH locus caused the 92-base-pair deletion that permanently inactivated Neu5Gc synthesis in ancestral humans.

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A single random genomic event caused by this mobile DNA sequence is proposed to be the root cause of human-specific susceptibility to red-meat-associated heart disease.

تعريف

Alzheimer's disease is a brain illness that slowly destroys memory and thinking.

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It used to be treated as completely separate from heart disease. Newer research suggests the two share more than we thought, including the same cholesterol-carrying particles and damage to the tiny blood vessels that feed the brain.

تعريف

The AMORIS (Apolipoprotein MOrtality RISk) study was a large Swedish prospective cohort that measured ApoB and other lipid fractions and demonstrated that ApoB was a stronger predictor of cardiovascular events than LDL-C, particularly in cases of discordance between the two measures.

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AMORIS is one of the foundational studies demonstrating that counting atherogenic particles matters more than measuring cholesterol mass alone.

تعريف

AMP-activated protein kinase is a cellular energy sensor that, when activated, suppresses cholesterol and fatty acid synthesis and exerts anti-inflammatory effects; bempedoic acid has been proposed to activate this pathway as part of its mechanism beyond simple LDL lowering.

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It is cited as a potential explanation for bempedoic acid's hsCRP-lowering effect, which is distinct from statins' mechanism.

تعريف

The gene encoding salivary amylase, the enzyme that begins starch digestion in the mouth; humans carry multiple copies of this gene, and a 2024 study in Science found that its duplication dates back nearly 800,000 years, suggesting starch digestion was a core human metabolic strategy long before agriculture.

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Understanding our evolutionary capacity to process carbohydrates helps explain why blanket low-carb or meat-only dietary prescriptions may not align with human biology.

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The amyloid hypothesis is the long-dominant theory of Alzheimer's disease holding that abnormal accumulation of amyloid-beta protein plaques in the brain is the primary initiating cause of neurodegeneration and cognitive decline.

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Understanding this hypothesis is essential context for evaluating whether vascular disease — not amyloid — may be the earlier, upstream driver of Alzheimer's.

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مقاومة البناء العضلي هي الحالة التي تتوقف فيها عضلات كبار السن عن الاستجابة بشكل جيد للبروتين. الشخص الأصغر سناً يمكنه تناول كمية معتدلة من البروتين وبناء العضلات، بينما الشخص الأكبر سناً الذي يتناول نفس الكمية قد لا يبني أي عضلات تقريباً.

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This is why protein needs go up with age rather than down, especially for older athletes trying to hold onto muscle.

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Angina is chest discomfort that happens when the heart muscle isn't getting enough oxygen. People describe it as pressure, tightness, squeezing, or burning, and it can spread to the arm, neck, or jaw.

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Not everyone gets classic chest pain. Some people just feel short of breath, unusually tired, or sick to their stomach. Very fit people sometimes feel almost nothing at all, which is exactly what makes their disease dangerous.

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Angiogenesis is the sprouting of new capillaries from existing microvessels, driven primarily by tissue hypoxia through HIF-1α–mediated transcription of vascular endothelial growth factor (VEGF). Because capillaries lack a muscular wall, they improve local oxygen diffusion but cannot compensate for a significant obstruction in a large coronary artery.

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Understanding the difference between angiogenesis and arteriogenesis clarifies why growing new tiny vessels is not enough to protect the heart during intense exercise.

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تصوير الأوعية الدموية هو اختبار يقوم فيه الأطباء بإدخال أنبوب رفيع في الشرايين وحقن صبغة لكي تظهر تفاصيل داخل الشرايين على صور الأشعة السينية.

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It shows the open channel that blood flows through. Its big weakness is that it does not show the artery wall — and plaque grows in the wall. An artery can look almost normal on an angiogram while carrying a lot of disease.

تعريف

يشير التراجع التصويري بالأشعة إلى انخفاض قابل للقياس في حجم انسداد الشريان التاجي كما يظهر في التصوير بالأشعة السينية للشرايين التاجية؛ وتستشهد المقالة بتجربة "لايف ستايل هارت" (Lifestyle Heart Trial) لإثبات أن اتباع نظام غذائي مكثف يعتمد على النباتات وتغييرات نمط الحياة يمكن أن ينتج هذا التأثير.

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It is the scientific term for what the article describes as 'shrinking blockages,' giving readers a precise label for this clinically important phenomenon.

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Angioplasty is a procedure where a small balloon is inflated inside a narrowed artery to push the blockage open. A stent is usually left behind to hold it open.

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It is very good at relieving symptoms and saving lives during a heart attack. What it does not do is fix the disease itself, which is spread throughout all your arteries, not just the one spot that got fixed.

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ANGPTL3 is a protein that slows the breakdown of triglyceride-rich particles in the blood.

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People born with a broken copy have low triglycerides, low LDL, and less heart disease — which made it an obvious drug target. Evinacumab blocks it and is used in the most severe inherited cholesterol disorders.

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An anomalous coronary artery is a congenital malformation in which a coronary artery originates from the wrong location or follows an abnormal path; during intense exertion the vessel can be compressed, reducing blood flow to the heart muscle and triggering ischemia or fatal arrhythmia.

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It is a leading structural cause of exertional sudden death in young athletes and is poorly detected by electrocardiography, requiring imaging for diagnosis.

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Antagonistic pleiotropy is an evolutionary hypothesis in which a gene or biological trait confers a survival or reproductive advantage early in life while becoming harmful later; applied to cardiovascular disease, it suggests that lipid-transport systems that may have offered benefits in ancestral environments become disadvantageous across long modern lifespans of caloric abundance.

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It offers one explanation for why humans are biologically susceptible to atherosclerosis despite its ultimately lethal consequences.

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Anti-HMGCR immune-mediated necrotizing myopathy is a rare autoimmune muscle disease, affecting roughly 2 per 100,000 statin users per year, in which the body generates antibodies against HMG-CoA reductase; unlike ordinary statin myalgia, it persists and worsens after the drug is stopped and requires immunosuppressive treatment.

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This condition is often mistaken for ordinary statin muscle pain, but stopping the statin alone will not resolve it — recognizing it early can prevent severe permanent muscle damage.

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The ability of moderate alcohol consumption to reduce clot formation through mechanisms including decreased fibrinogen levels and reduced platelet reactivity; while this may slightly lower ischemic stroke risk, the same blood-thinning effect raises the risk of hemorrhagic stroke, illustrating alcohol's double-edged cardiovascular profile.

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Understanding this trade-off helps explain why any apparent benefit for one type of stroke comes at the cost of increased risk for another.

تعريف

An anticoagulant reduces the blood's ability to clot by interfering with clotting proteins. Warfarin and apixaban are examples.

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It is a different tool from aspirin, which acts on platelets instead. Anticoagulants are used for atrial fibrillation and clots in veins; using one where the other is needed leaves a person poorly protected.

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مُخفّض ضغط الدم هو أي دواء يُستخدم لخفض ارتفاع ضغط الدم. تُميّز المقالة بين خافضات ضغط الدم — التي أصبح استخدامها شائعاً اعتباراً من سبعينيات القرن العشرين فصاعداً — وبين أدوية الستاتين، مشيرةً إلى أن أدوية ضغط الدم أسهمت في انخفاض الوفيات الناجمة عن أمراض الشريان التاجي قبل فترة طويلة من توفر علاج الستاتين.

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Blood-pressure control through antihypertensives is one of the most evidence-backed ways to prevent heart attacks and strokes, making deterioration in population blood-pressure control a key reason the recent stall in progress is worrying.

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مضاد الأكسدة هو مادة تمتص الجزيئات الضارة في الجسم. فيتامين إي وبيتا كاروتين هما مثالان.

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The theory sounded great, and antioxidant pills were popular for years. But when researchers actually tested them in large trials, they did not prevent heart attacks, and a few appeared to cause harm. It is a good reminder that a sensible-sounding idea still has to be tested.

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Antiplatelet therapy uses drugs that make platelets less likely to clump — aspirin, clopidogrel, ticagrelor.

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It is the mainstay after a stent or a heart attack, where a clot forming on a damaged or instrumented surface is the immediate danger. The benefit is always weighed against bleeding.

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The Antithrombotic Trialists' Collaboration is a landmark individual-participant meta-analysis that pooled data from major aspirin trials; it found that aspirin's proportional reduction in vascular events is similar in primary and secondary prevention, but the absolute benefit in primary prevention is far smaller—roughly 0.06% per year—because baseline event rates are much lower.

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This analysis is the statistical foundation for why aspirin recommendations differ so sharply between people with and without established heart disease.

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A prescription oral antiviral drug combining nirmatrelvir and ritonavir that inhibits SARS-CoV-2 replication; it is typically prescribed early in infection to reduce the severity and duration of COVID-19, including in individuals with underlying conditions such as cardiovascular disease.

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Cardiovascular disease patients are at elevated risk from COVID-19, making antiviral treatment options particularly relevant.

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The aorta is the biggest artery in your body. It carries blood out of the heart and down through the chest and belly, sending branches everywhere.

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Because it handles so much pressure, it can stretch, stiffen with age, or develop a bulge. In athletes, the aorta is often slightly larger than average, which raises questions about what counts as normal.

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An aortic aneurysm is a bulge in the wall of the aorta, like a weak spot on a garden hose.

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Small ones often cause no trouble and are simply watched over time. Larger ones can tear or burst, which is a life-threatening emergency. Size and how fast it is growing are what doctors watch most closely.

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The capacity of the aorta to expand during systole and recoil during diastole, acting as a pressure buffer that smooths pulsatile blood flow; compliance decreases as collagen cross-linking and fibrosis stiffen the arterial wall with inactivity or aging.

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Loss of aortic compliance is the root mechanical cause of the cardiovascular aging discussed throughout this article and can be partially restored by committed exercise.

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Aortic dissection is a life-threatening emergency in which a tear in the aortic intima allows blood to split through the medial layer, creating a false lumen; it presents as sudden, severe tearing or ripping chest or back pain that is at its worst from the very first second, and may cause unequal pulses between arms.

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Recognizing the difference between dissection pain and ordinary exertional soreness can be the difference between life and death for an athlete with undiagnosed aortic disease.

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The section of the aorta immediately above the heart where it exits the left ventricle; it is a common site for early atherosclerotic plaque formation and is routinely measured in mouse models of heart disease to quantify plaque burden.

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Plaque measured at the aortic root is a standard benchmark for judging how severely atherosclerosis has progressed.

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Aortic stenosis is a narrowing or hardening of the aortic valve — the heart's primary outflow valve — that obstructs blood flow from the left ventricle to the aorta; elevated Lp(a) is recognised as the second leading cause of calcific aortic stenosis.

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It shows that Lp(a) harms the heart beyond arteries alone, making Lp(a) testing relevant even for people focused on valve health.

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The aortic valve is the one-way gate between the heart's main pumping chamber and the aorta.

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It can narrow with age as calcium builds up on it, or leak. Elevated Lp(a) is one of the few known risk factors for the narrowing, connecting valve disease to the same particle biology as plaque.

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Aortic wall stress is the mechanical tension per unit area acting on the aortic wall, calculated from transmural pressure, vessel radius, and wall thickness; cardiac MRI studies in patients with thoracic aortic disease have measured peak AWS of 257–323 kPa during moderate aerobic exercise, well below the 850–1,200 kPa rupture threshold.

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AWS is the key measurable variable that determines how close an aneurysmal aorta is to mechanical failure during any given level of physical exertion.

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Aortopathy is a broad clinical term encompassing any disease process that compromises the structural integrity or function of the aortic wall, including both inflammatory-atherosclerotic conditions such as AAA and heritable structural disorders such as Marfan syndrome.

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Athletes with undiagnosed aortopathy face unique risks during intense exertion that would not apply to a healthy individual with a similarly enlarged aorta.

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A large glycoprotein chain attached to the LDL core of a lipoprotein(a) particle whose structure closely resembles plasminogen, thereby inhibiting the body's natural clot-dissolving system and contributing to thrombotic risk on top of Lp(a)'s atherogenic and pro-inflammatory effects.

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It explains the third prong of Lp(a)'s 'triple threat'—beyond carrying cholesterol and oxidized phospholipids, it actively interferes with clot breakdown.

تعريف

الـ ApoB هو بروتين يوجَد على السطح الخارجي لكل جزيء كوليسترول يمكن أن يلتصق بجدار الشريان ويسبب اللويحات. ويحمل كل جزيء من هذه الجزيئات بروتين ApoB واحداً بالضبط.

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That one-to-one rule is what makes it so useful. Measuring ApoB counts the particles. A standard cholesterol test measures the cargo inside the particles instead, which can be misleading if your particles are unusually empty or full.

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Discordance is when your ApoB and your LDL cholesterol tell two different stories. Your LDL looks fine, but your particle count is high — or the reverse.

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It happens when your particles are carrying less cholesterol than usual, so it takes more of them to add up to the same number on the lab report. It is especially common in people with insulin resistance or diabetes. When the two disagree, ApoB is the one that tracks your actual risk.

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The APOB R3500Q (p.Arg3527Gln) founder variant is a mutation in the APOB gene found in roughly 12% of Pennsylvania Old Order Amish — far above its 0.1–0.4% prevalence in white European populations — that causes familial defective ApoB-100 and persistently elevated LDL-C from birth.

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This variant serves as a natural experiment showing that lifelong LDL elevation leads to a dramatically higher burden of coronary calcification even in a population with a healthy lifestyle and favorable genetic background.

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أبوبروتين بي-100 هو الشكل الكامل لأبوبروتين بي الموجود على البروتينات الدهنية منخفضة الكثافة، ومنخفضة الكثافة جداً، ومنخفضة الكثافة المتوسطة، والبروتينات الدهنية المتبقية؛ حيث ترتبط مجالاته الأحماض الأمينية مشحونة إيجابياً بشكل أيوني بالسلاسل الجانبية للبروتيوغليكان مشحونة سلباً في جدار الشريان، مما يؤدي إلى حبس الجسيم جسدياً في الغلالة الداخلية وبدء تكوين اللويحات.

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It is the molecular 'hook' that locks harmful particles inside artery walls—understanding it explains why particle count matters more than cholesterol weight alone.

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أبو ب-48 هو شكل إسوي مقطوع من بروتين شحمي قُطاعي ب يُنتج في الأمعاء ويوجد حصراً على الكيلومكرونات وبقاياها؛ وعلى عكس أبو ب-100، لا يتم قياسه بواسطة تحاليل أبو ب السريرية القياسية في حالة الصيام، مما يعني أن اختبارات أبو ب الروتينية تعكس عبء الجسيمات العصيدة من البروتينات الدهنية المشتقة من الكبد بدلاً من امتصاص الدهون الغذائية.

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Knowing this isoform exists clarifies what a standard ApoB blood test does and does not count, so you can interpret your results accurately.

تعريف

البروتينات الدهنية - بما في ذلك البروتينات الدهنية منخفضة الكثافة، ومنخفضة الكثافة المتوسطة، ومنخفضة الكثافة جداً، وبقاياها - والتي يحمل كل منها جزيئاً واحداً من أبوليبوبروتين بي على سطحها؛ يُعد عدد الجزيئات (وليس كتلة الكوليسترول وحدها) محركاً رئيسياً لتصلب الشرايين نظراً لإمكانية احتجاز كل جزيء داخل جدار الشريان.

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The article repeatedly explains that metabolic 'wins' on keto do not offset a rise in apoB/LDL, making this concept central to the keto-vs-WFPB comparison.

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مؤشر سنوات-أبوB هو مقياس بحثي مقترح يمثل التعرض التراكمي لبروتين الشحم العصوي ب بمرور الوقت، معبراً عنه بمساحة تحت منحنى أبوB مقابل العمر بوحدة مغم/ديسيلتر·سنة؛ وهو مصمم لالتقاط عبء الجسيمات العصيدية المدمجة بشكل مباشر أكثر من أي قياس منفرد، ولكنه لم يُعتمد بعد كأداة سريرية أو عتبة للعلاج.

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Understanding that lifetime particle exposure — not just today's number — drives plaque build-up reframes why early prevention matters.

تعريف

A lipid risk metric comparing the concentration of ApoB (reflecting all atherogenic particles) to ApoA1 (reflecting HDL, the primary reverse-cholesterol-transport particle); used in INTERHEART as a proxy for dyslipidemia, it had an odds ratio of 3.43 for myocardial infarction and the highest population attributable risk of any single risk factor studied.

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It captures both the 'bad' particle burden and the 'good' particle capacity in a single number, offering a more complete picture of lipid-related risk than LDL-C alone.

تعريف

APOC3 is the gene for a protein that blocks the clearance of triglyceride-rich particles from your blood.

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Less of it means faster clearance. People carrying a naturally broken copy have lower triglycerides and fewer heart attacks, which is strong evidence that these particles are causing harm rather than just tagging along.

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APOE is a gene that comes in three common versions, labeled E2, E3, and E4. It controls how efficiently your liver clears leftover fat particles.

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The E4 version raises both cholesterol and Alzheimer's risk, which is one of the threads connecting heart disease and brain disease. Knowing your type does not change treatment much, but it can explain an otherwise puzzling lipid pattern.

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The APOE ε4 allele is a common variant of the apolipoprotein E gene and the largest known common genetic risk factor for late-onset Alzheimer's disease; it promotes cerebrovascular damage and blood-brain barrier breakdown independently of its effects on amyloid and tau.

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The article argues APOE ε4 acts substantially through vascular pathways, bridging systemic lipoprotein biology and brain disease and supporting the broader vascular hypothesis.

تعريف

An apolipoprotein is a protein attached to a fat-carrying particle in your blood. Fat and water don't mix, so these proteins act like a wrapper that lets fat travel safely through the bloodstream.

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Different wrappers mark different kinds of particles. ApoB marks the harmful ones. ApoA-I marks HDL. Knowing which wrapper you are measuring tells you which particles you are counting.

تعريف

أبوبروتينات الدهنية أ-١ هي البروتين الهيكلي الرئيسي لجسيمات البروتين الدهني عالي الكثافة (HDL)، وهي تقريظاً ما يعادل البروتين الدهني (أبو بي) بالنسبة للجسيمات الضارة.

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It carries out the actual work of collecting cholesterol from cells. Measuring it gives a slightly better picture of HDL function than the cholesterol number alone, though neither has proven useful as a treatment target.

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Apolipoprotein E is a protein that serves as the primary cholesterol carrier within the brain, shuttling cholesterol from cholesterol-synthesizing astrocytes to neurons via a brain-specific lipoprotein system entirely separate from plasma lipoproteins.

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Its brain-specific role in cholesterol transport is distinct from its well-known role in plasma lipid metabolism and Alzheimer's disease risk.

تعريف

Arachidonic acid is a long-chain omega-6 fatty acid produced in the body from linoleic acid; it serves as a precursor to both pro-inflammatory and anti-inflammatory signaling molecules called eicosanoids, meaning its role in inflammation is more complex than the simple 'seed oils cause inflammation' narrative suggests.

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It is the key intermediate in the proposed inflammatory pathway linking seed oils to heart disease, so knowing what it actually does clarifies why that theory is incomplete.

تعريف

In cardiovascular lipidology, area under the curve refers to the cumulative, time-integrated exposure to atherogenic lipoproteins over a lifetime; it captures the idea that decades of moderately elevated LDL-C or ApoB deliver far more total arterial damage than a brief period of very high levels.

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This concept explains why starting lipid-lowering therapy at 30 rather than 50 can fundamentally change long-term heart-disease risk.

تعريف

الأرجينين هو حمض أميني موجود في الأطعمة الكاملة مثل الجوز، ويعمل بمثابة السلائف البيوكيميائية التي يستخدمها الجسم لتخليق أكسيد النيتريك، مما يدعم بالتالي استرخاء بطانة الأوعية الدموية وتوسعها بشكل صحي.

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Its presence in whole-food sources—but not in refined oils—helps explain why whole walnuts preserve vascular function while extracted oils impair it.

تعريف

ARIC, the Atherosclerosis Risk in Communities study, has followed thousands of American adults since the late 1980s.

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Decades of follow-up let researchers watch risk factors measured in middle age play out into actual events much later. It is one of the studies behind the idea that exposure over time, not a single reading, is what counts.

تعريف

Arrhythmogenic cardiomyopathy is an inherited disease, often caused by variants in desmosomal proteins such as plakophilin-2, in which heart muscle is progressively replaced by fatty or fibrous tissue, creating an electrical substrate for life-threatening ventricular arrhythmias; endurance exercise volume is associated with earlier and more severe disease expression.

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It is one of the leading causes of exercise-related sudden death in young people, and exercise itself can accelerate the underlying disease process.

تعريف

Structural or electrical changes in heart tissue — such as enlarged atria and patchy fibrosis — that make the heart susceptible to sustaining an abnormal rhythm; in athletes, years of high-volume training can create such a substrate even in the absence of symptoms.

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Explains why AF tends to recur in athletes even after successful ablation.

تعريف

ARRIVE was a randomized placebo-controlled trial of 100 mg aspirin daily in roughly 12,500 moderate-cardiovascular-risk adults without diabetes; it found no significant reduction in the primary cardiovascular composite endpoint and more gastrointestinal bleeding, partly because actual event rates were far lower than anticipated due to widespread statin and antihypertensive use.

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ARRIVE illustrates how improvements in other preventive treatments have reduced the baseline risk that made aspirin useful, changing the benefit–risk equation.

تعريف

The deposition of calcium crystals within the arterial wall, which stiffens the vessel and in coronary arteries is used as a marker of atherosclerotic burden; some evidence suggests vitamin K2 may help inhibit its progression.

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Understanding calcification helps explain why vitamin K2 is studied as a cardiovascular supplement and why a high calcium score signals elevated risk.

تعريف

الإزالة الجسدية للكوليسترول والدهون الأخرى من داخل جدار الشريان، والتي لوحظت نسيجياً في نماذج الرئيسيات غير البشرية بعد تقييد الدهون الغذائية؛ وتمثل الخطوة الأبكر والأكثر أساسية في التراجع الهيكلي للويحات.

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It confirms that the regression seen in imaging trials reflects a real biological change in artery composition, not just a measurement artifact.

تعريف

A deposit within the artery wall made up of lipids, immune cells, cellular debris, and fibrous tissue that accumulates over time and can narrow or block blood flow; also called an atherosclerotic lesion or atheroma.

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Plaque formation is the central process linking microplastic exposure to heart attack and stroke risk in this study.

تعريف

Remodeling is the way an artery changes shape as plaque builds up. Often the artery bulges outward to make room, keeping the opening in the middle wide enough for blood to pass.

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This is why heart disease can hide for decades. The artery is quietly filling with plaque, but because it expanded outward, tests that only look at the opening say everything is fine.

تعريف

Arterial stiffness is a measure of how much an artery's wall resists expansion with each pulse of blood; it increases with age as elastin is lost and collagen accumulates, and manifests clinically as a rising systolic blood pressure alongside a falling or stable diastolic blood pressure after about age 60.

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Arterial stiffness is a direct, measurable consequence of vascular aging that contributes independently to cardiovascular risk.

تعريف

Arteriogenesis is the structural remodeling of pre-existing small arterio-arteriolar anastomoses into mature, muscular conducting arteries, driven primarily by increased fluid shear stress rather than tissue hypoxia. Unlike angiogenesis, which produces only tiny capillaries, arteriogenic vessels can handle meaningful bulk arterial flow.

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It is the mechanism behind the heart's 'backup pipes' and explains both why fit athletes tolerate coronary blockages silently and why that protection has a hard ceiling.

تعريف

الشريان هو وعاء دموي يحمل الدم بعيداً عن القلب إلى باقي الجسم.

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Artery walls have layers. Plaque does not build up inside the open channel like gunk in a pipe — it builds up inside the wall itself. That difference explains a lot about why heart disease is so easy to miss.

تعريف

A finding on a cardiac test that mimics a sign of disease but is actually caused by technical interference, movement, or normal variation rather than a true abnormality; physicians must distinguish artifacts from genuine pathological signals to avoid misdiagnosis.

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Dr. Megdal's doctor initially dismissed his ST depression as an artifact—a decision that delayed diagnosis and illustrates a key challenge in interpreting exercise EKGs in athletes.

تعريف

ASCVD is the clinical shorthand for disease caused by plaque buildup in the arteries — it covers coronary artery disease, most strokes, and peripheral artery disease under one label.

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It's the term driving guideline recommendations and risk calculators, because it groups the different places plaque can cause trouble into the single risk that lifestyle and medication decisions are actually aimed at reducing.

تعريف

Aspirin makes blood platelets less sticky, so clots are less likely to form.

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If you have already had a heart attack or stroke, daily aspirin usually helps. If you have not, the picture changed: newer studies found the bleeding risk roughly cancels out the benefit for most healthy adults. This is one of the clearest examples of medical advice reversing based on better evidence.

تعريف

ASPREE was a large randomized trial testing daily low-dose aspirin versus placebo in adults aged 70 and older (65 and older for U.S. minorities) who were free of cardiovascular disease; it found no significant reduction in cardiovascular events and a higher rate of major bleeding and all-cause mortality in the aspirin group, forming a key basis for recommending against aspirin initiation in older…

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ASPREE is one of the three pivotal modern trials that shifted guidelines away from routine aspirin use in healthy older people.

تعريف

كانت دراسة ASTEROID تجربة أعطت المرضى أعلى جرعة من أتورفاستاتين (أو روزوڤاستاتين) وصورت لويحات الشريان التاجي لديهم باستخدام الموجات فوق الصوتية داخل الأوعية قبل التجربة وبعدها.

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It showed measurable plaque shrinkage — one of the first clear demonstrations that very low LDL can reverse disease, not merely halt it.

تعريف

دراسة رئيسية باستخدام التصوير بالموجات فوق الصوتية داخل الشرايين أجريت عام 2006، والتي أدى فيها استخدام روزوفاستاتين بجرعة 40 ملغ يومياً لمدة 24 شهراً إلى انخفاضات ذات دلالة إحصائية في كل من نسبة حجم العصيدة وإجمالي حجم العصيدة، مما يوفر أول دليل واسع النطاق على أن العلاج المكثف بالستاتين يمكن أن يتراجع عن اللويحات التاجية.

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ASTEROID established aggressive LDL lowering as a proven strategy for shrinking plaques and set the benchmark for subsequent regression trials.

تعريف

Astrocytes are a type of support cell (glia) in the brain that act as the primary cholesterol-manufacturing cells of the central nervous system, supplying cholesterol to neurons for membrane maintenance and myelin support. Because lipoproteins in the blood cannot cross the blood–brain barrier, the brain depends almost entirely on astrocyte-derived cholesterol synthesis.

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Disruption of astrocyte cholesterol production is implicated in neurodegenerative conditions, and understanding this isolated synthesis helps explain why systemic LDL levels do not directly reflect brain cholesterol status.

تعريف

تكون العصيد الشرياني هو العملية تدريجية لتشكل اللويحة.

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It starts when an ApoB particle slips into the artery wall and gets trapped. The body treats it as an invader and sends in immune cells. Those cells eat the trapped cholesterol, get stuck themselves, and die there. Repeat this for twenty years and you have a plaque.

تعريف

Atherogenic dyslipidemia is a lipid pattern characterized by elevated triglycerides, low HDL cholesterol, and an increased proportion of small, dense LDL particles; it is commonly seen with insulin resistance, visceral obesity, and sedentary behavior, and is associated with accelerated atherosclerosis.

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Standard cholesterol tests can miss this pattern, making it an important concept for understanding hidden cardiovascular risk.

تعريف

A logarithmically derived ratio of triglycerides to HDL cholesterol used as a marker of atherogenic lipoprotein particle size and cardiovascular risk; the article notes that an elevated AIP correlates with coronary calcium burden and major adverse cardiovascular events independent of traditional risk factors.

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AIP offers an additional layer of risk information beyond the CAC score itself, particularly for patients with borderline results.

تعريف

The atherogenic lipoprotein hypothesis is the scientific proposition that apolipoprotein B-containing lipoproteins are the primary causal drivers of atherosclerotic cardiovascular disease, meaning the number of these particles circulating in the blood directly determines the rate of plaque formation in arterial walls.

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Understanding this hypothesis explains why researchers have shifted focus from total cholesterol to particle counts as the key measure of heart disease risk.

تعريف

الجسيمات المسببة لتصلب الشرايين هي البروتينات الدهنية التي تحتوي على الأبوبروتين ب (ApoB)—بما في ذلك البروتينات الدهنية منخفضة الكثافة، ومنخفضة الكثافة المتوسطة، ومنخفضة الكثافة جداً، والبروتين الدهني (أ)—والتي يمكنها دخول جدار الشريان والاحتفاظ به لبدء نمو اللويحات الحصينية والحفاظ عليه؛ وتستخدم المقالة هذا المصطلح لوصف ما يجب خفضه بشكل كبير ومستدام لتحقيق تراجع اللويحات.

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The article's main practical message is to lower these particles, so readers need a precise understanding of what the term covers beyond just 'LDL'.

تعريف

إجمالي عدد جزيئات البروتينات الدهنية المحتوية على الأبوبروتين بي (ApoB) الدائرة في مجرى الدم - بما في ذلك البروتينات الدهنية منخفضة الكثافة (LDL)، وبقايا البروتينات الدهنية منخفضة الكثافة جداً (VLDL)، والبروتين الدهني (أ) [Lp(a)] - بصرف النظر عن كتلة الكوليسترول التي تحملها؛ ويرى إجماع جمعية تصلب الشرايين الأوروبية أن عدد الجزيئات، الذي يتم قياسه بأفضل شكل عبر قياس الأبوبروتين بي (ApoB)، هو مؤشر أكثر دقة لخطر الإصابة بتصلب الشرايين مقارنة بتركيز الكوليسترول المرتبط بالبروتينات الدهنية منخفضة الكثافة (LDL-C) وحده.

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Shifting focus from cholesterol mass to particle number is the central scientific reframing of the article, explaining why ApoB measurement is replacing traditional LDL-C testing.

تعريف

عصيدة الشرايين هي مصطلح آخر للترسبات الدهنية داخل جدار الشريان - وهي في الأساس مرادف للبلاك، وتُستخدم بشكل أكثر شيوعاً في الكتابات البحثية.

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The root gives us "atherosclerosis." It comes from a Greek word for gruel, describing what the soft core of a plaque actually looks like.

تعريف

تصلب الشرايين هو المرض الكامن وراء معظم النوبات القلبية والعديد من السكتات الدماغية. عالقة جزيئات الكوليسترول في جدار الشريان، فيرسل الجسم خلايا مناعية للتنظيف، وعلى مدى سنوات تتصلب هذه الفوضى لتتحول إلى لويحات.

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The key thing to understand is that it starts young — often in the teens and twenties — and grows silently for decades before anyone notices. By the time it causes a symptom, it has usually been building for most of your life.

تعريف

A condition in which plaques composed of lipids, inflammatory cells, and fibrous tissue build up within the walls of the coronary arteries, narrowing them and reducing blood flow to the heart; it is the leading cause of heart attacks worldwide.

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Megdal's diagnosis and self-reported reversal of this condition is the medical backdrop that makes his athletic achievements particularly striking.

تعريف

The measurable reduction in the size or lipid content of coronary artery plaques, documented by angiography or imaging; it requires a sustained biochemical environment of low circulating LDL and low inflammatory signaling so that cholesterol efflux from the arterial wall exceeds influx.

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It is the central clinical goal of the dietary protocols discussed in the article—moving beyond slowing disease to actually reversing it.

تعريف

The athlete calcification paradox is the well-documented finding that lifelong endurance athletes accumulate more coronary artery calcium and total plaque than sedentary people of similar age, yet have substantially lower cardiovascular mortality — meaning more 'rust' does not translate into greater death risk in this population.

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It is the central finding that forces doctors and athletes to rethink what a high calcium score actually means in a person who exercises intensely.

تعريف

The athlete paradox is the observation that some lifelong endurance athletes have higher coronary artery calcium scores and greater total plaque burden than less active peers, despite otherwise favorable cardiovascular risk profiles, suggesting that extreme chronic exercise may independently promote arterial calcification.

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It challenges the simple assumption that more exercise always means lower heart disease risk.

تعريف

Athlete's heart describes the normal changes that happen to a heart trained hard for years. The walls thicken a bit, the chambers get bigger, and the resting pulse drops.

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These changes are healthy adaptations, not disease. The complication is that they can look similar to real heart problems on a test, so they need to be read by someone who understands athletes.

تعريف

أتورفاستاتين، الذي يُباع تحت اسم ليبيتور، هو أحد أقوى نوعين من ستاتين ومن أكثر الأدوية وصفاً في العالم.

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At high dose it typically lowers LDL by around half. It is inexpensive, generic, and backed by more outcome evidence than almost any other drug in medicine.

تعريف

ATP-citrate lyase is an enzyme that acts two steps upstream of HMG-CoA reductase in the mevalonate pathway, cleaving citrate to supply the raw material for cholesterol synthesis; bempedoic acid inhibits this enzyme to reduce hepatic cholesterol production.

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Because ACLY is the target of bempedoic acid, understanding it explains how this newer drug lowers LDL by a mechanism distinct from statins.

تعريف

رجفان أذيني، والذي غالباً ما يُختصر بـ AFib، هو نبض قلب سريع وغير নিয়মিত يبدأ في حجرتي القلب العلويتين.

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Because those chambers quiver instead of squeezing properly, blood can pool and form a clot, which may travel to the brain and cause a stroke. Interestingly, endurance athletes get AFib more often than couch potatoes — one of the few ways heavy exercise raises a risk instead of lowering it.

تعريف

Microscopic scarring of atrial muscle tissue, often resulting from chronic mechanical stretch or inflammation; fibrosis disrupts normal electrical conduction and is a well-established predictor of AF recurrence after ablation.

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Fibrosis is one of the main reasons why ablation is less durable in long-term endurance athletes.

تعريف

The brief interval after each electrical activation during which atrial muscle cells cannot respond to a new stimulus; when this period is shortened — as occurs during sympathetic surges or with vagal tone — the atria become more vulnerable to rapid, disorganized firing and AF onset.

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A shorter refractory period is one of the key electrical mechanisms linking intense exercise to AF in trained athletes.

تعريف

Structural and electrical changes in the atria — including enlargement, wall thickening, fibrosis, and altered ion-channel expression — that develop in response to chronic pressure or volume overload; in endurance athletes, sustained high cardiac output drives this process and increases AF susceptibility.

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Atrial remodeling is the underlying mechanism linking years of hard endurance training to elevated AF risk.

تعريف

A form of atrial flutter whose reentrant circuit does not follow the classic right-atrial pathway but instead arises from fibrotic or scarred tissue elsewhere in the atria; in athletes post-ablation, it often signals disease progression beyond the originally isolated pulmonary vein triggers.

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Its emergence after ablation is a warning sign that the underlying arrhythmogenic substrate is advancing, not resolved.

تعريف

A statistical measure of a diagnostic test's ability to discriminate between patients who will and will not experience an event, ranging from 0.5 (no better than chance) to 1.0 (perfect discrimination); in the CONFIRM2 registry, AI-QCT raised the AUC for predicting major cardiac events from 0.62 to 0.75.

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The AUC figure is how the article quantifies the improvement in predictive accuracy that AI-QCT provides over standard testing.

تعريف

Disorders in which the immune system mistakenly attacks the body's own tissues; Cordain argues that grains—which are evolutionarily recent foods—are associated with certain autoimmune conditions, citing gluten-related and lectin-related mechanisms as possible triggers.

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This claim is a key reason the Paleo framework discourages grains and is worth understanding when evaluating grain-free diets.

تعريف

An automated external defibrillator, or AED, is a portable device that can shock a stopped heart back into rhythm. It talks you through what to do, and it will not deliver a shock unless one is needed.

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When someone collapses from cardiac arrest, survival drops with every passing minute. A bystander with an AED nearby saves far more lives than waiting for an ambulance.

تعريف

Autophagy is a cellular housekeeping process by which cells break down and recycle damaged proteins and organelles; in arterial macrophages, it helps clear lipid debris and prevents the accumulation of plaque. The article's 2024 Nature Metabolism finding suggests that high single-meal protein doses may suppress autophagy in these immune cells, potentially worsening atherosclerosis in animal model…

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Autophagy in artery-wall immune cells is the proposed mechanism linking large protein meals to cardiovascular risk, making it central to the article's '25-gram paradox.'

تعريف

Autopsy-negative sudden unexplained death is a classification applied when a complete post-mortem examination, including cardiac-specific pathological review, identifies no structural cause for a fatal cardiac event; it represents the single largest adjudicated category in contemporary NCAA athlete SCD data at approximately 20% of cases.

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Knowing that one in five young cardiac deaths leaves no structural trace explains why screening strategies focused solely on anatomy cannot prevent all events.

تعريف

الأكسدة الذاتية هي تفاعل تلقائي بين الدهون والأكسجين الجوي، يبدأ وينتشر دون الحاجة إلى مصدر اشتعال خارجي؛ وتزداد سرعة هذا التفاعل مع زيادة عدد الروابط المزدوجة في الحمض الدهني، مما يجعل زيوت البذور عالية التعدد غير المشبعة أكثر عرضة للتزنخ أثناء التخزين أو التسخين المتكرر مقارنة بالدهون المشبعة أو أحادية غير المشبعة.

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It is the chemical basis for advice to store oils in cool, dark conditions and avoid reusing frying oil.

تعريف

The mean internal diameter measured across an entire standardized arterial segment between reference markers, as opposed to the single narrowest point; the Megdal study uses ALD change across red tick–marked segments to document diffuse, wall-wide regression in the LAD and Circumflex rather than improvement at one focal spot only.

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ALD reveals whether the whole artery is healthier, not just whether one isolated hot-spot improved.

تعريف

A catheter-based procedure in which a small balloon is inflated inside a narrowed coronary artery to compress the plaque and widen the vessel; widely used before stents were developed but limited by a high rate of the artery re-narrowing (restenosis) after the procedure.

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Balloon angioplasty was the predecessor to stenting and understanding its limitations explains why stents became the dominant approach.

تعريف

تُعد «دراسة بالتيمور الطولية للشيخوخة» دراسة أتباعية مستقبلية طويلة الأمد، تتابع حالة رجال أصحاء على مدى عقود، وقد وثقت أن مستوى هرمون التستوستيرون الكلي ينخفض بمعدل يتراوح بين 1 و2% تقريبًا في السنة بعد العقد الثالث من العمر، في حين ينخفض مستوى التستوستيرون الحر والمتاح بيولوجيًا بمعدل أسرع يبلغ حوالي 2–3% في السنة، مع ارتفاع مستوى بروتين SHBG في الوقت نفسه.

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It provides foundational data on how male hormone levels change with age, supporting the clinical importance of measuring bioavailable rather than total testosterone.

تعريف

An uncoated metal mesh tube implanted inside a coronary artery to hold it open; unlike drug-eluting stents, it carries no medication and has a higher tendency to become re-blocked by overgrowth of arterial tissue (neointimal hyperplasia).

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Understanding the difference between stent types helps patients ask informed questions about which device is being recommended and why.

تعريف

The Bassler hypothesis was a 1970s claim by physician Thomas Bassler that completing a standard marathon conferred near-absolute protection against fatal coronary atherosclerosis; autopsy studies in the late 1970s and 1980s documenting coronary artery disease in runners who died during training quickly disproved it.

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Understanding this discredited idea explains why doctors once assumed fit athletes were immune to heart disease — and why its collapse reshaped how we screen athletes today.

تعريف

A protein that supports the survival, growth, and plasticity of neurons; estradiol promotes BDNF-associated signaling pathways, and its decline during menopause may reduce synaptic maintenance and contribute to memory complaints.

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BDNF is a key molecular bridge between estrogen loss and cognitive changes, making it relevant to understanding menopausal brain health.

تعريف

Belly fat that sits deep in the abdomen, wrapped around the organs, is called visceral fat. It is different from the softer fat you can pinch under the skin.

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Visceral fat is active. It sends out chemical signals that raise blood sugar, blood pressure, and triglycerides. This is why waist size can predict heart trouble better than weight on the scale.

تعريف

حمض البيمبيدويك هو حبوب خفض الكوليسترول التي تعمل في الكبد، في نقطة تسبق تماماً النقطة التي تعمل فيها الستاتينات.

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Its main advantage is that it stays out of muscle tissue, so it rarely causes the muscle aches some people get from statins. That makes it a useful option for people who truly cannot tolerate a statin.

تعريف

Benefit–risk balance refers to the quantitative comparison of the absolute reduction in harmful events a treatment prevents against the absolute increase in harmful events it causes; for aspirin, this balance is highly favorable in secondary prevention (where event rates are high) but close to neutral or unfavorable in primary prevention (where event rates are low).

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This concept is the central framework of the entire aspirin debate—the same drug can be lifesaving for one person and harmful for another depending on their underlying risk.

تعريف

A beta blocker is a medicine that slows the heart and makes it beat less forcefully, which lowers blood pressure and reduces how much oxygen the heart needs.

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Common examples include metoprolol and carvedilol. They are widely used after heart attacks and in heart failure, where a calmer, slower heart is easier on damaged muscle.

تعريف

Impaired capacity of the insulin-secreting beta cells of the pancreatic islets to produce sufficient insulin in response to rising blood glucose; in type 2 diabetes, prolonged metabolic stress can cause irreversible beta-cell loss that limits the degree of disease reversal possible.

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The article uses beta-cell dysfunction as a parallel to myocardial scarring to illustrate the broader principle that suppressing a disease process does not always undo the organ damage it has already caused.

تعريف

An alternative homocysteine remethylation route, operating mainly in the liver and kidney, that uses betaine rather than 5-methyltetrahydrofolate as the methyl donor; it supplements but does not replace the folate-dependent pathway.

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It explains why homocysteine lowering with B vitamins is sometimes incomplete and why organ-specific factors like liver and kidney health affect the response.

تعريف

Enlargement of both the left and right atria, a structural change driven in endurance athletes by years of high cardiac output and sustained volume loading; it creates a stretched, electrically unstable tissue environment that predisposes to atrial fibrillation.

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Understanding why the atria enlarge helps explain why reducing training volume — not just treating symptoms — is essential for long-term rhythm control.

تعريف

An indoor cycling track located in Aguascalientes, Mexico, at approximately 1,887 meters above sea level, known for its steeply banked turns and high-altitude conditions that favour aerodynamic speed for record attempts.

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The venue's altitude and banking angle are central to understanding the conditions—and trade-offs—under which Megdal set his world hour record.

تعريف

A bicuspid aortic valve has two flaps instead of the usual three. It is present from birth in roughly one person in a hundred.

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It is the most common heart abnormality people are born with. It tends to narrow earlier in life and often comes with a wider aorta, so both need periodic monitoring.

تعريف

Biglycan is a small leucine-rich proteoglycan present in the arterial subendothelial matrix that, along with versican and decorin, binds apoB-containing lipoprotein particles through ionic interactions, contributing to their retention in the intima as an initiating step in atherosclerosis.

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Understanding the specific molecules that trap particles helps explain why reducing particle number is more important than cholesterol content per particle.

تعريف

Bile acids are made by your liver from cholesterol and released into the gut to help digest fat.

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This is the body's main route for disposing of cholesterol. Soluble fiber works by binding bile acids so they leave the body instead of being reabsorbed, forcing the liver to pull more cholesterol from the blood.

تعريف

A next-generation coronary scaffold made from materials that are gradually broken down and absorbed by the body over time, leaving no permanent metallic structure inside the artery.

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Because no metal remains, bioabsorbable stents avoid the lifelong risk of in-stent thrombosis associated with permanent metal devices.

تعريف

التستوستيرون الحيوي المتاح هو مجموع الجزئين الحر (غير المرتبط) والمرتبط باللبومين من التستوستيرون الدائر في الدم - وهو الجزء القابل للوصول فعلياً إلى الأنسجة - على عكس الجزء المرتبط بـ SHBG، والذي يكون غير نشط بيولوجياً في الظروف العادية.

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This is the clinically meaningful number that predicts symptoms; total testosterone alone can be misleading.

تعريف

A popular term for self-experimentation with diet, supplements, technology, or lifestyle practices aimed at optimizing physical performance, health, or longevity; it lacks a standardized scientific definition and often promotes unvalidated interventions.

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Knowing the term helps readers critically evaluate trendy health claims that may outpace the supporting evidence.

تعريف

A medication derived from living cells or biological sources rather than chemical synthesis; unlike small-molecule drugs such as statins, biologics are typically large proteins administered by injection and are designed to target specific molecules in the body.

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Understanding that Repatha is a biologic helps explain why it works through a completely different mechanism than statins and has a distinct side-effect profile.

تعريف

The tendency of established structural damage—such as calcified plaques or myocardial scar tissue—to persist even after the active disease process driving that damage has been halted, because the biochemical and cellular remodeling involved is largely irreversible.

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This concept explains why early intervention produces better outcomes than late intervention, a recurring theme in the article's discussion of plaque types and heart-attack scarring.

تعريف

فترة الكمون البيولوجي في تصلب الشرايين هي الفاصل الزمني بين بدء تلف الشرايين الناتج عن الجسيمات المحتوية على بروتين "أبو بي" (ApoB) والنقطة التي تنمو عندها الآفة بشكل يتيح للتصوير السريري اكتشافها؛ وتؤكد دراسات تشريح جثث الجنود الشباب و"دراسة بوغالوسا للقلب" أن المرض المجهري شائع الحدوث قبل فترة طويلة من إيجابية أي فحص تصويري.

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Latency explains why a clean heart scan in a young person with very high cholesterol can be misleading rather than reassuring.

تعريف

المؤشر الحيوي هو شيء قابل للقياس في الجسم يخبرك عن الصحة أو المرض - مثل قيمة مخبرية، أو نتيجة مسح، أو قراءة ضغط الدم.

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The catch is that changing a biomarker does not automatically mean you have changed your fate. A number can improve while the underlying disease keeps going. Good biomarkers are ones that have been proven to track real outcomes.

تعريف

ذرة كربون محاطة من كلا الجانبين بروابط مزدوجة كربون-كربون في سلسلة حمض دهني؛ وهذا التكوين معرض بشكل خاص لهجوم الجذور الحرة، وهو السبب الهيكلي الذي يجعل الدهون المتعددة غير المشبعة تتأكسد أسرع من الدهون المشبعة أو الدهون الأحادية غير المشبعة.

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This is the precise chemical feature that makes seed oils less stable at high heat, grounding the cooking-stability advice in molecular reality.

تعريف

The Bloch pathway is one of two main routes by which lanosterol is converted to cholesterol, proceeding through the intermediate desmosterol before a final reduction by the enzyme DHCR24. It predominates in the testes, adrenal glands, and developing neurons, where the desmosterol intermediate itself serves a biological function.

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Defects in specific enzymes of this pathway cause inherited sterol disorders that can present with cardiovascular and neurological complications.

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A blood clot is a clump of blood cells and protein that forms to stop bleeding.

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Clots are lifesaving when you cut yourself. They are dangerous when they form inside an artery. Most heart attacks happen when a plaque cracks open and a clot forms on top of it, suddenly shutting off blood flow.

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ضغط الدم هو قوة دفع الدم ضد جدران الشرايين. ويُكتب على شكل رقمين، مثل 120/80. الرقم العلوي هو الضغط عندما ينقبض قلبك، والفل السفلي هو عندما يسترخي.

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High blood pressure damages artery walls over time and makes it easier for cholesterol particles to get in. It usually causes no symptoms at all, which is why it gets missed for years.

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سكر الدم، أو الجلوكوز، هو الوقود الذي تعمل به خلاياك. يعمل جسمك بجهد للحفاظ عليه ضمن نطاق ضيق.

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When it stays high for years, it damages blood vessels throughout the body — including the ones feeding your heart, kidneys, eyes, and nerves. High blood sugar often shows up alongside high triglycerides and a high particle count.

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The total circulating volume of blood in the body; endurance training expands plasma volume and red cell mass, increasing oxygen delivery to muscles and contributing to higher VO₂max in trained athletes.

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Expanded blood volume is one of the key physiological adaptations distinguishing elite masters athletes from sedentary age-matched individuals.

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The blood–brain barrier is a highly selective cellular interface lining the brain's blood vessels that blocks lipoprotein particles from entering the central nervous system, meaning the brain must synthesize all of its own cholesterol locally.

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Understanding this barrier explains why lipid-lowering drugs do not deplete brain cholesterol, addressing a common concern about statin safety and cognitive effects.

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A CT imaging phenomenon in which dense calcified deposits appear larger than they truly are due to signal spillover, creating a bright 'halo' that can obscure adjacent non-calcified plaque or distort lumen assessment.

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This artifact is a key reason standard CAC scans can underestimate the full extent of coronary disease lurking beside calcified spots.

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خمس مناطق جغرافية — أوكيناوا، وسردينيا، ولوما ليندا، ونيكويا، وإيكاريا — حددها الباحث دان بويتنر، حيث يعيش سكانها لفترة أطول بكثير من المتوسط العالمي؛ وتتميز وجباتهم الغذائية بأنها نباتية بشكل ثابت بنسبة تتراوح بين 90 و95%، وتركز على البقوليات والحبوب الكاملة والدرنات.

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Blue Zone populations offer real-world, long-term evidence of which dietary patterns are associated with exceptional longevity.

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مؤشر كتلة الجسم، أو BMI، هو رقم يتم حسابه من طولك ووزنك، ويستخدم كقياس تقريبي لحجم الجسم.

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It is convenient but crude. It cannot tell muscle from fat, and it says nothing about where your fat is stored. A muscular athlete can land in the overweight range while being perfectly healthy, and a thin person can carry dangerous visceral fat.

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بحث بوجالوسا للقلب شرايين الأطفال والشباب الذين توفوا في حوادث في بلدة في لويزيانا.

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The findings were startling: fatty streaks and early plaque in teenagers, and more of it in those with higher cholesterol and blood pressure. It is direct evidence that heart disease begins decades before anyone feels anything.

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تمدد الشريان العضدي بوساطة التدفق (FMD) هو اختبار بالموجات فوق الصوتية غير جراحي يقيس مقدار اتساع الشريان العضدي في الجزء العلوي من الذراع استجابةً لزيادة تدفق الدم، مما يعكس وظيفة بطانة الأوعية الدموية التي تعتمد على أكسيد النيتريك؛ وهو مؤشر بديل يرتبط بالخطر القلب والأوعية الدموية في الدراسات القائمة على الملاحظة ولكنه ليس بحد ذاته نقطة نهاية سريرية مثل النوبة القلبية أو السكتة الدماغية.

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Many dietary fat studies use FMD as an outcome, so knowing its limitations helps readers weigh those results appropriately.

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A major artery branching from the aortic arch that supplies blood to the head, neck, and right arm; in mouse atherosclerosis studies it is a key site for plaque measurement because it develops lesions rapidly and reproducibly.

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The 624% plaque increase reported at this artery is the study's most striking finding, so knowing what it is matters.

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The Bradford Hill criteria are a set of nine principles—including strength of association, consistency, biological plausibility, and dose-response—used to evaluate whether an observed statistical association between an exposure and a disease is likely to be causal.

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They are the standard framework scientists use to judge whether LDL truly causes heart disease rather than just correlating with it.

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A small group of riders who accelerate away from the main field (peloton) during a race, hoping to hold their lead to the finish line.

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The tactical decision to chase the breakaway drove the high-intensity cardiovascular effort that is the athletic centrepiece of the article.

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A randomized controlled trial (Wright et al., 2017) testing a whole food plant-based diet in a community setting for obesity, ischemic heart disease, or diabetes; the WFPB group achieved greater weight loss at six and twelve months than any other trial that did not mandate calorie restriction or exercise.

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It is one of the few RCTs directly comparing plant-based eating to usual care for weight loss without confounding calorie counting.

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The foundational molecular mechanism described by Nobel laureates Michael Brown and Joseph Goldstein, showing that liver cells regulate their own cholesterol uptake through surface receptors that bind and clear LDL from the bloodstream; this discovery explained familial hypercholesterolemia and became the biological rationale for statins, PCSK9 inhibitors, and all subsequent LDL-lowering therapie…

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Every cholesterol-lowering drug discussed in the article ultimately works by exploiting or augmenting this pathway, making it the conceptual bedrock of modern lipid medicine.

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A short-chain fatty acid produced when gut bacteria ferment dietary fiber; it strengthens the intestinal barrier, reducing the leakage of bacterial toxins (such as LPS) into the bloodstream that would otherwise drive systemic inflammation.

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It connects diet and gut health directly to cardiovascular inflammation, showing that what you eat shapes your inflammatory risk.

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A randomized controlled trial of 506 participants that tested high-dose B vitamins (5 mg folic acid, 0.4 mg B-12, 50 mg B-6) versus placebo for approximately three years, with carotid intima-media thickness progression as the primary endpoint; the main result was negative.

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It is the largest imaging trial directly testing whether B vitamins slow arterial plaque progression in people with mildly elevated homocysteine.

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تأخذ جراحة المجازفة وعاءً دمويًا سليمًا من مكان آخر في جسمك وتستخدمه لتوجيه الدم حول شريان تاجي مسدود بشدة.

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Like a stent, it restores blood flow to muscle that was starving. Also like a stent, it treats one location. The disease process continues in the rest of your arteries unless the underlying causes are addressed.

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بروتين سي التفاعلي، أو اختصاراً CRP، هو مادة يصنعها الكبد عندما يوجد التهاب في مكان ما في جسمك. تُستخدم نسخة حساسة من الاختبار، وهي (hs-CRP)، لتقدير خطر الإصابة بأمراض القلب.

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A high result means inflammation, but not where it is coming from — a cold, arthritis, or gum disease will raise it too. It adds information but does not replace measuring your particle count.

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A measure of a predictive model's ability to correctly rank individuals by risk, equivalent to the Area Under the ROC Curve (AUC); it ranges from 0.5 (no better than chance) to 1.0 (perfect discrimination), with values above 0.80 generally considered clinically useful.

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It allows direct comparison of how well traditional risk scores versus AI imaging actually identify who will have a heart attack.

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The least functionally impaired category in UCI paracycling, reserved for athletes with a limb deficiency, leg-length discrepancy, or impaired muscle power or range of movement that is mild enough to allow racing on a standard bicycle.

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Classification determines who an athlete competes against and which records apply, making it essential context for evaluating Megdal's performances.

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CAD-RADS (نظام تقارير وإبلاغ مرض الشريان التاجي) هو مقياس تصنيف قياسي يُستخدم للإبلاغ عن نتائج تصوير الأوعية المقطعي المحوسب للشريان التاجي، ويراوح من 0 (لا توجد لويحات أو تضيق) إلى 5 (شريان واحد على الأقل مسدود تماماً)؛ وحصل المريض المؤشر على درجة CAD-RADS 0، مما يعكس عدم وجود لويحات يمكن اكتشافها فوق عتبة التصوير.

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Knowing what CAD-RADS 0 means—and what it cannot rule out—is essential to interpreting the 'perfect' scan result discussed throughout the article.

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Calcific aortic valve stenosis is a condition in which calcium deposits progressively stiffen and narrow the aortic valve, ultimately obstructing blood flow from the heart; Lp(a)-borne oxidized phospholipids are a principal driver of the underlying valvular inflammation and calcification.

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It explains why some people with seemingly controlled cholesterol still develop severe heart valve disease requiring surgery.

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التكلس هو ترسب الكالسيوم في اللويحة، مما يجعل جزءاً منها صلباً وعظمياً.

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It sounds bad, and a high total amount does signal a lot of disease. But the hardening itself is partly the body's repair job — a hard, stable plaque is less likely to crack open than a soft, greasy one. This is why statins and heavy exercise can both make plaque look more calcified while making it safer.

تعريف

اللويحة المتكلسة هي الجزء الصلب الممتلئ بالكالسيوم من اللويحة. وتظهر بشكل ساطع في التصوير المقطعي المحوسب، وهو ما يقيسه فحص الكالسيوم.

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Athletes often have more calcified plaque than non-athletes, but it tends to be the dense, stable kind. The amount and the type both matter, not just the total number.

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A CT imaging artifact in which a dense calcified deposit spreads or 'blooms' beyond its true boundaries due to detector limitations, obscuring adjacent soft tissue and making it impossible to assess non-calcified plaque sitting next to the calcium.

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The article cites calcium blooming as a key reason conventional CT missed dangerous soft plaque, and explains how photon-counting CT solves it.

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درجة الكالسيوم (درجة كالسيوم الشريان التاجي) هي رقم مشتق من التصوير المحوري المحوسب يحدد الكمية الإجمالية للبلاك المتكلس في الشرايين التاجية؛ تشير النتيجة القاتمة (صفر) إلى عدم وجود بلاك متكلس يمكن اكتشافه، بينما تعكس الدرجات الأعلى عبئاً أكبر من البلاك وارتفاعاً في مخاطر الإصابة بأمراض القلب والأوعية الدموية.

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It is the most direct, widely available way to see whether plaque has actually formed in your arteries, going beyond what cholesterol tests can reveal.

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A sustained reduction in calorie intake without malnutrition that consistently downregulates growth signaling, enhances autophagy, and extends lifespan in a wide range of organisms; it is considered one of the most reproducible pro-longevity interventions in experimental biology.

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Caloric restriction is the benchmark intervention against which most dietary longevity strategies are compared, and it underpins advice about avoiding chronic overeating earlier in life.

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كاناكينوماب هو جسم مضاد وحيد النسيلة يستهدف إنترلوكين-1 بيتا (IL-1β)، وهو بروتين إشارة التهابي رئيسي؛ وكان هو الدواء الفعال في تجربة CANTOS، حيث قلل من الأحداث القلبية الوعائية دون التأثير على كوليسترول البروتين الدهني منخفض الكثافة (LDL).

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Its cardiovascular benefit without any cholesterol lowering was landmark evidence that inflammation is a therapeutic target in heart disease in its own right.

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كانت دراسة CANTOS (دراسة نتائج الكاناكينوماب المضادة للالتهاب والتخثر) تجربة عشوائية واسعة النطاق اختبرت عقار الكاناكينوماب، وهو دواء يثبط الإشارة الالتهابية IL-1β، مقارنةً بدواء وهمي؛ وبالجرعة المحددة مسبقًا البالغة 150 ملغ، قلل هذا الدواء من الأحداث القلبية الوعائية الكبرى بنسبة تقارب 15% دون خفض مستوى الكوليسترول الضار (LDL)، مما يوفر دليلاً مباشرًا على أن الالتهاب يؤدي إلى النوبات القلبية عبر مسار مستقل…

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It proved that targeting inflammation alone — separate from cholesterol — can reduce heart attacks, a finding that reshaped how scientists think about what drives plaque rupture.

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The CANTOS (Canakinumab Anti-inflammatory Thrombosis Outcomes Study) trial was a landmark randomized controlled trial that tested whether canakinumab, an IL-1β inhibitor, could reduce cardiovascular events in high-risk patients with elevated hs-CRP after myocardial infarction; its positive results provided the first direct clinical evidence that inflammation is a causal, therapeutically modifiabl…

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CANTOS changed how cardiologists think about residual risk by showing inflammation is not just a bystander—it is a treatable target.

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Capillary density refers to the number of tiny blood vessels per unit of muscle tissue; regular endurance exercise increases capillary density, improving oxygen and nutrient delivery to working muscles, an adaptation that drugs cannot produce.

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Higher capillary density is part of the structural fitness that keeps muscles and organs well-supplied as we age.

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انخفاض كثافة الشعيرات الدموية هو الفقد المرتبط بالعمر لكثافة الشعيرات الدموية داخل العضلات الهيكلية، مما يزيد المسافة التي يجب أن يقطعها الأكسجين من الدم إلى ألياف العضلات ويقلل من كفاءة استخلاص الأكسجين أثناء التمرين.

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It is one of the peripheral mechanisms that erodes aerobic capacity in older athletes even when the heart itself is well-preserved.

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An 8-carbon saturated fatty acid found in small amounts in coconut oil (~7–9%) and concentrated in purified MCT oils; it is rapidly absorbed, transported directly via the portal vein, and oxidized in the liver, accounting for most of the thermogenic and ketogenic effects attributed to MCT preparations in research studies.

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Most metabolism studies praising MCTs used oils rich in C8:0—not coconut oil—making this distinction crucial for evaluating coconut oil's weight-loss claims.

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الكربوهيدرات هي السكريات والنشويات الموجودة في الطعام — الخبز، والأرز، والمكرونة، والفواكه، والبطاطس، والحلويات.

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Quality matters more than quantity for most people. Whole grains, beans, and vegetables behave very differently in the body than white flour and sugar, even though they are all technically carbohydrates.

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A concentrated, rapidly absorbed source of simple carbohydrates in a semi-liquid form, consumed immediately before or during endurance exercise to maintain blood glucose and delay glycogen depletion.

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Fueling strategy before a maximal aerobic effort is a practical cardiovascular nutrition topic relevant to heart patients who exercise.

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A carbohydrate-restricted diet is a dietary pattern that substantially limits carbohydrate intake—ranging from strict ketogenic diets to broader low-carb approaches—and is the dietary context in which the Lean Mass Hyper-Responder phenotype and associated LDL elevations are most commonly observed.

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Knowing this term helps readers understand why the LDL debate has intensified alongside the popularity of keto eating.

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CARDIA has followed young adults from their twenties into later life, tracking fitness, cholesterol, blood pressure, and what eventually happened to them.

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Because it started so early, it captured the years when plaque is silently forming. It supplies much of the evidence that risk factors in your twenties shape your arteries in your fifties.

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Cardiac arrest is when the heart suddenly stops pumping and the person collapses, stops breathing normally, and loses consciousness within seconds.

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It is not the same as a heart attack. A heart attack is a plumbing problem — blocked blood flow. Cardiac arrest is an electrical problem — the heart's rhythm falls apart. A heart attack can trigger one, but so can other things. Without CPR and a defibrillator, survival drops fast.

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Cardiac catheterization is a procedure where a thin tube is threaded through a blood vessel, usually from the wrist or groin, up into the heart's arteries.

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Doctors use it to see blockages, measure pressures, and often to place a stent in the same session. It is how many people first learn how much disease they actually have.

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الأداث القلبية ذات الدلالة السريرية - بما في ذلك احتشاء عضلة القلب، والذبحة الصدرية غير المستقرة، والوفاة القلبية - والتي تُستخدم كنقاط نهاية نتائج في التجارب القلبية الوعائية.

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Trials are ultimately judged on whether they reduce cardiac events, not just on changes in imaging or blood tests.

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A condition in which blood flow to the heart muscle is insufficient to meet its oxygen demand, typically caused by narrowed coronary arteries; it can produce chest pain (angina), reduced exercise capacity, or, if severe, a heart attack.

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Ischemia is the underlying mechanism linking blocked arteries to the symptoms and performance losses described throughout the article.

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تقنية تصوير بالرنين المغناطيسي للقلب متخصصة يمكنها توصيف موقع ونمط ومدى إصابة عضلة القلب، مما يساعد في التمييز بين الاحتشاء الإيسشيمي (الإقفاري) والالحالات غير الإيسشيمية مثل التهاب عضلة القلب أو متلازمة تاكوتسوبو.

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CMR is essential in MINOCA workup because it reveals where and how the heart muscle was injured, guiding the search for an underlying mechanism.

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Cardiac MRI uses magnetic fields rather than X-rays to image the heart in fine detail, with no radiation.

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It is the best test for scarring in the heart muscle, which makes it valuable for distinguishing an athlete's healthy enlarged heart from genuine disease.

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A medically supervised program of exercise, education, and lifestyle modification prescribed after a cardiac event such as a heart attack, designed to improve cardiovascular function and reduce the risk of future events.

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The article presents cardiac rehab as the clearest real-world hint that improving VO₂ max can causally lower mortality.

تعريف

اعتلال عضلة القلب هو مرض يصيب عضلة القلب نفسها، وليس الشرايين المغذية لها.

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The muscle may thicken, stretch, or stiffen. Several forms are inherited, and they are among the leading causes of sudden death in young athletes — a different problem entirely from plaque.

تعريف

The measurable restoration of heart and lung function following disease or injury, assessed through indices such as ejection fraction, VO2 max, and resting heart rate; it forms the physiological basis for structured cardiac rehabilitation programs.

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Quantifying cardiopulmonary recovery allows clinicians and patients to track whether lifestyle and exercise interventions are producing real biological benefit.

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اللياقة القلبية التنفسية هي مدى كفاءة عمل قلبك ورئتيك وعضلاتك معاً لاستخدام الأكسجين أثناء التمرين الشاق. وغالباً ما تُقاس بمعدل استهلاك الأكسجين الأقصى (VO2 max).

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It is one of the strongest predictors of how long you will live — stronger than most lab values. But being extremely fit does not make you immune to plaque, which is a hard lesson many endurance athletes have learned.

تعريف

أمراض القلب والأوعية الدموية هي مصطلح شامل للمشكلات المتعلقة بالقلب والأوعية الدموية، بما في ذلك النوبات القلبية، والسكتات الدماغية، وانسداد شرايين الساق.

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It is the leading cause of death worldwide. Most of it traces back to the same underlying process: plaque slowly building in artery walls over decades.

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A cardiovascular outcomes trial is a large, long-term randomized controlled trial specifically designed to measure whether a drug reduces major cardiovascular events such as heart attack, stroke, or cardiovascular death, rather than only improving a lab value or surrogate marker; regulators began requiring them for diabetes drugs after 2008.

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CVOTs are why we know these medicines actually prevent heart attacks, not just lower blood sugar — a distinction critical for evaluating their real-world benefit.

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Carnitine is a nutrient found mostly in red meat. Your body also makes some on its own.

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It matters here because gut bacteria can convert carnitine into a compound called TMAO, which has been linked to heart disease. How strong that link really is remains debated.

تعريف

The carotid arteries run up either side of your neck and supply blood to your brain.

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They are easy to scan with ultrasound, so researchers often use them to study plaque without needing to look at the heart directly. Plaque in a carotid artery can break loose and cause a stroke.

تعريف

سُمك الطبقة الوسطى والباثنة للشريان السباتي هو قياس بالموجات فوق الصوتية للسمك المشترك للطبقتين الداخليتين لجدار الشريان السباتي في الرقبة؛ ويشير المعدل الأسرع للتثخن إلى تسارع تصلب الشرايين، ويُستخدم كعلامة بديلة للخطر القلب الوعائي في تجارب مثل إيليت.

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It is a key surrogate endpoint used to test whether hormone therapy slows arterial aging without needing to wait for heart attacks to occur.

تعريف

The rate at which the combined thickness of the innermost two layers of the carotid artery wall increases over time, measured by ultrasound and used as a surrogate imaging marker of atherosclerosis progression or regression in clinical trials.

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Many homocysteine studies used this measure instead of counting heart attacks, making it essential for interpreting whether B vitamins actually slow plaque development.

تعريف

The CASCADE FH Registry is a United States-based patient registry that prospectively collects clinical, genetic, and treatment data from individuals with familial hypercholesterolemia; in HoFH research it has provided key evidence comparing outcomes between patients diagnosed and treated in childhood versus adulthood.

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Registry data from CASCADE FH quantified the survival benefit of early diagnosis and treatment, directly shaping current pediatric screening recommendations.

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A case-control study starts with people who already have a disease, finds similar people who do not, and looks backward for differences.

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It is efficient for rare conditions. Its weakness is that it relies on recall and records from the past, and people who are ill tend to remember their history differently.

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A case-crossover study compares a person's exposure in the short period just before an acute event — such as a heart attack — with their exposure during earlier 'control' periods in their own life, making each person their own control. The article uses case-crossover data to report that the odds of myocardial infarction roughly double in the hour after acute anger.

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This design is why the 'anger triggers heart attacks' finding is more credible than it might first appear — but it measures acute triggers, not long-term risk.

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The dominant protein in cow's milk, accounting for roughly 80% of its total protein content; rodent studies have shown that casein can promote tumour growth at high intake levels and suppress it at lower levels, findings that have been influential but also contested when extrapolated to other animal proteins.

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Understanding casein's specific effects helps evaluate whether cancer-risk claims about animal protein apply broadly or only to dairy-derived protein.

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Catecholaminergic polymorphic ventricular tachycardia is an inherited channelopathy in which abnormal calcium handling in heart muscle cells causes life-threatening ventricular arrhythmias triggered specifically by the catecholamine surge of exercise or emotional stress, with a structurally normal heart at autopsy.

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CPVT illustrates how exercise can be directly arrhythmogenic through biochemical rather than mechanical mechanisms, and it is easily missed by standard structural screening.

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A USA Cycling licence category indicating an intermediate-level amateur road racer, below Category 1–2 elite amateurs and professionals; used to benchmark the competitive field Megdal trains against in Memphis.

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Knowing the category helps readers gauge how demanding Megdal's training environment is relative to his age-group competition.

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A procedure in which a cardiologist threads a thin flexible tube (catheter) into the heart and uses energy — typically radiofrequency heat or cryotherapy — to destroy small areas of tissue responsible for triggering abnormal electrical signals; the main interventional treatment for AF.

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The article centers on what athletes can expect from ablation, so knowing how the procedure works matters.

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CAUGHT-CAD is a 2025 randomized trial that studied patients with a family history of premature coronary artery disease and found that Coronary CT Angiography — rather than standard calcium scoring alone — was necessary to detect non-calcified plaque and direct timely clinical intervention.

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The trial is cited as direct evidence that standard calcium scanning is insufficient for people with strong inherited cardiac risk.

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Causation means one thing actually makes another thing happen. It is different from correlation, which only means two things tend to show up together.

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This distinction runs through almost every health headline you read. Wine drinkers were healthier — but the wine was not the reason. Sorting real causes from tag-alongs is most of the work in medical research.

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الامتصاص الخلوي الكهفي هو عملية تُنقل من خلالها الجسيمات الدهنية البروتينية منخفضة الكثافة وغيرها من الجسيمات الدهنية البروتينية التي تحتوي على البروتين الدهني (ب) عبر طبقة الخلايا البطانية إلى جدار الشريان عبر حويصلات صغيرة محاطة بغشاء تُسمى الكهفيات؛ وتشارك مستقبلات تشمل مستقبل البروتين الدهني منخفض الكثافة (LDLR)، والمستقبل الكامس (SR-B1)، ومستقبل كيناز أكتيفين الشبيه بالنوع الأول (ALK1) في هذا المسار، كما تؤدي التراكيز الأعلى للبروتين الدهني (ب) في الدم إلى زيادة معدل دخول الجسيمات بطريقة تعتمد على التركيز.

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This mechanism explains at a molecular level why very high ApoB concentrations overwhelm the artery's defenses and drive plaque formation regardless of metabolic fitness.

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Coronary CT angiography is a non-invasive imaging test that uses X-ray computed tomography to produce detailed pictures of the coronary arteries, allowing doctors to detect and characterize both calcified and non-calcified plaque without inserting a catheter.

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It is the key imaging tool used to detect the 'silent' plaque buildup described in athletes throughout the article.

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Cellular senescence is a state in which damaged cells permanently stop dividing but remain metabolically active, secreting inflammatory signals that can promote local tissue damage; in aging arteries, senescent cells cluster at plaque sites and contribute to chronic low-grade vascular inflammation.

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Senescent cells are one of the key mechanisms by which aging adds cardiovascular risk beyond simple cholesterol exposure.

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The CENIT (Coronary Disease and the Effect of High-Intensity Interval Training) trial was a randomized study of 60 patients with stable coronary artery disease that used intravascular ultrasound to measure whether six months of supervised HIIT at 85–95% of peak heart rate changed plaque volume compared with standard care. It found HIIT reduced percent atheroma volume by 1.2% and total normalized…

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It is one of the few trials showing exercise can shrink measurable plaque in people already on heart medication.

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A model of fatigue proposing that the brain anticipates physiological limits and reduces muscle recruitment before the body actually reaches failure, acting as a protective regulatory system rather than allowing true muscular exhaustion.

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It reframes fatigue as a negotiable brain signal rather than a fixed physical wall, with implications for how athletes and cardiac rehab patients push through perceived limits.

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The outward pseudo-force experienced by a rider as the banked track redirects the bicycle through a curve; on steeply banked velodromes the effective gravitational load on the rider can approach twice normal body weight, imposing additional cardiovascular and musculoskeletal stress.

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Repeated high G-force loading in each lap raises physical strain during sustained maximal cardiac output, relevant to any athlete managing heart disease.

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Cerebral amyloid angiopathy is a condition in which amyloid-beta protein deposits accumulate in the walls of small blood vessels in the brain, weakening them and predisposing to microbleeds and impaired blood flow.

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CAA illustrates how vascular and amyloid pathology directly overlap in the brain, complicating the separation of 'pure' Alzheimer's from vascular dementia.

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Cerebral small vessel disease refers to a spectrum of pathological changes affecting the small arteries, arterioles, capillaries, and venules of the brain, distinct from large-artery atherosclerosis in its drivers and manifestations. It produces white-matter lesions, lacunar infarcts, and contributes to cognitive decline and vascular dementia.

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CSVD illustrates that arterial disease is not confined to the heart—the same risk factors silently damage the brain's tiny vessels, linking cardiovascular and cognitive health.

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Disease affecting the blood vessels supplying the brain, including stroke; cited alongside cardiovascular disease as an outcome reduced by vegetarian and vegan diets in an umbrella review of meta-analyses.

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Shows that the cardiovascular benefits of plant-based diets extend beyond the heart to include brain circulation.

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دراسة سريرية لتقييم تأثير تحليل لويحات الشريان التاجي باستخدام تقنية AI-QCT على قرارات الأطباء العلاجية؛ وقد خلصت الدراسة إلى أن النتائج المستمدة من الذكاء الاصطناعي أدت إلى تغيير مسار العلاج لدى 57.1% من المرضى، حيث زاد استخدام الستاتين بنسبة 28.1%، ووصف الأسبرين بنسبة 23%، وتقلصت الفحوصات اللاحقة غير الضرورية بنسبة 37%.

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It demonstrates that AI imaging translates into concrete changes in patient care, not merely better pictures.

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CETP is a protein that swaps cholesterol and triglycerides between HDL and the harmful ApoB particles.

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Blocking it raises HDL dramatically, so drug companies spent billions trying. Most of those drugs failed to prevent heart attacks, and one caused harm. It became the clearest evidence that raising HDL is not itself a treatment.

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A class of drugs designed to block cholesterol ester transfer protein, an enzyme that shuttles cholesterol from HDL to LDL particles; clinical trials such as ILLUMINATE and ACCELERATE showed that pharmacologically raising HDL-C this way did not reduce cardiovascular events, shifting the field's focus toward HDL function rather than concentration.

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Their failure helped overturn the assumption that simply raising 'good cholesterol' numbers protects the heart.

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A clinical scoring tool used to estimate stroke risk in patients with atrial fibrillation, assigning points for risk factors such as age, sex, hypertension, diabetes, heart failure, prior stroke, and vascular disease; a score of 2 or higher typically triggers a recommendation for oral anticoagulation.

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Knowing your score determines whether you must stay on blood thinners — a decision that directly affects which sports are safe to play.

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A channelopathy is an inherited disorder of cardiac ion-channel proteins that disrupts the electrical signals controlling heart rhythm without producing any visible structural abnormality detectable at autopsy; examples include long QT syndrome and catecholaminergic polymorphic ventricular tachycardia.

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Channelopathies can cause sudden death in a structurally normal heart, making them invisible to tests that look only for physical abnormalities.

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A large ecological study conducted in the 1980s comparing diet patterns, biomarkers, and disease mortality across rural Chinese counties with largely plant-based diets; it reported dramatically lower coronary artery disease mortality and substantially lower serum cholesterol levels in rural China compared with the United States.

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This project is a foundational reference for the link between plant-dominant diets and lower cardiovascular mortality, though its ecological design limits causal inference.

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A long-running longitudinal study of elderly and oldest-old adults in China, widely used to examine survival, diet, and healthspan in people aged 80 and above, including centenarians.

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This is the primary source for the article's claim that strict vegetarian patterns may be associated with lower odds of reaching 100 in very old age.

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CHIP is a condition in which a mutation in a bone marrow stem cell gives its descendants a growth advantage, so that a measurable fraction of a person's blood cells share that mutation; it becomes increasingly common with age and is associated with roughly a two-fold increase in coronary heart disease risk, likely because the mutant immune cells behave more aggressively in the artery wall.

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CHIP is an under-recognized age-related mechanism that raises heart disease risk independently of traditional risk factors like cholesterol.

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الكوليسترول هو مادة شمعية يحتاجها جسمك. وهو يدخل في تكوين جدران الخلايا، والهرمونات، وفيتامين د، والصفراء التي تهضم طعامك. كنت ستتموت دونه.

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The problem is not cholesterol existing. The problem is how much of it is riding around in your bloodstream inside particles that can burrow into artery walls.

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عندما يتراكم الكوليسترول بما يتجاوز ما يمكن للوحة العصيدية احتواءه في محلول، فإنه يتبلور إلى هياكل حادة تشبه الإبر.

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These crystals physically damage immune cells and trip the NLRP3 alarm, producing a burst of inflammation. They can also puncture a fibrous cap from the inside.

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Cholesterol efflux capacity is a laboratory test of how well someone's HDL actually pulls cholesterol out of cells — a measure of function rather than quantity.

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It predicts risk better than the HDL number does, which supports the view that HDL quality is what matters. It remains a research test, not something you can order routinely.

تعريف

See CETP for the full entry.

تعريف

Cholesterol synthesis is your body making its own cholesterol, mostly in the liver. Almost every cell can do it.

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This is why cutting cholesterol out of your food does less than people expect — when you eat less, your body simply makes more. It is also why statins work: they slow the factory rather than blocking the food.

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A large-scale pooled analysis of randomized trials of LDL-lowering therapies that demonstrated each approximately 1 mmol/L reduction in LDL-C reduces major vascular events by just over one-fifth per year, with no evidence of a safe lower threshold, providing key quantitative support for treating elevated LDL-C.

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It gives the specific numbers behind why LDL-raising from coconut oil is clinically relevant, not just a statistical abstraction.

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Cholesterol-years is a cumulative-exposure metric that multiplies a person's average LDL-C level (in mg/dL) by the number of years they have carried that level, analogous to pack-years for tobacco. The concept holds that it is the total lifetime burden of apoB-containing lipoproteins, not any single reading, that determines when and how severely atherosclerosis develops.

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Understanding cumulative exposure explains why modest LDL levels sustained for decades can be more dangerous than high levels for a short period—and why early treatment matters far more than late treatment.

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إسترات الكوليسترول هي أشكال تخزين للكوليسترول حيث يرتبط حمض دهني بالكوليسترول؛ وهي تتراكم بكميات كبيرة داخل الخلايا الرغوية والمساحات خارج الخلايا في اللويحات، ويعد استنفادها -المقاس كتراجع للتجمع الغني بالليपिدات- علامة أساسية لتحسن اللويحات في دراسات التراجع لدى الرئيسيات.

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Understanding what actually clears during reversal (cholesteryl ester pools, not fibrous or calcified tissue) sets realistic expectations for what treatment can achieve.

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Choline is a nutrient found in eggs, red meat, and liver. Your body genuinely needs it, especially for the brain.

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Like carnitine, it can be converted by gut bacteria into TMAO. This is the biological chain that connects certain foods to a possible heart risk through the gut microbiome.

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كبريتات الكوندرويتين هي سلسلة جليكوزامينوجليكان سالبة الشحنة ترتبط ببروتيوغليكانات الشرايين مثل البيغليكان والفرسيكان؛ وهي ترتبط أيونياً ببروتين "أبو بي-100" (ApoB-100) موجب الشحنة الموجود على جزيئات الكوليسترول المنخفض الكثافة (LDL)، مما يثبتها في الحيز تحت البطاني ويبدأ عملية تصلب الشرايين.

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It is the molecular 'Velcro' that traps LDL in artery walls—a key reason why the arterial wall is not a passive bystander in heart disease.

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Chronic kidney disease is a lasting reduction in the kidneys' ability to filter waste from the blood.

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It raises cardiovascular risk independently and steeply — many people with kidney disease die of heart disease before their kidneys fail. It also alters calcium handling in blood vessels.

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A sustained reduction in blood pH caused by an excess of acid-producing foods relative to base-producing foods; high animal-protein diets have been proposed to cause this state and thereby leach calcium from bones, though modern evidence does not support this mechanism when overall mineral intake is adequate.

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This claim has been used to argue that high-protein diets harm bone health—knowing the evidence helps you weigh that concern.

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A psychological strategy of breaking a large, overwhelming task into smaller, manageable units to reduce perceived difficulty and sustain motivation; used in cardiac rehabilitation and endurance sport to help patients and athletes continue through prolonged discomfort.

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It provides a practical mental framework for managing pain and effort during extended physical or medical challenges.

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الكيلوميكרון هو جسيم كبير جداً ينقل الدهون من وجبة طعامك خارج أمعائك إلى مجرى الدم.

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Whole chylomicrons are too big to squeeze into an artery wall, so they are not directly dangerous. But as they shrink and drop off their cargo, the leftovers — called remnants — are small enough to get in and cause trouble.

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Circumferential wall stress is the tensile force acting around the circumference of an artery due to internal blood pressure; it rises with higher pressure and greater arterial diameter, and repeated extreme elevations during intense exercise may contribute to structural changes in the arterial wall.

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The article identifies exercise-driven surges in this force—reaching up to 250 mmHg—as a potential driver of the mechanical remodeling that may facilitate atherogenesis in endurance athletes.

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One of the two main branches of the left coronary artery, which curves around the back of the heart to supply the lateral and posterior left ventricular wall; the Megdal Serial Angiogram shows the Circumflex improved from mild-to-moderate narrowing (30–45%) in 2014 to improved patency below 20% in 2018, contributing to the evidence of diffuse, systemic regression.

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Improvement in the Circumflex alongside the LAD shows the healing was not confined to one artery, strengthening the case for a true systemic effect.

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Creatine kinase is an enzyme released from damaged muscle cells into the bloodstream; a markedly elevated blood CK level is used to confirm that muscle injury is genuine and pharmacological rather than purely symptom-based.

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CK testing is the frontline blood test that helps doctors determine whether a patient's muscle pain is truly caused by a statin or by another source.

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CLEAR Outcomes was a large trial that tested bempedoic acid in people who couldn't tolerate statins, to see whether it lowered heart attack and stroke risk the way statins do.

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It did — event rates fell in step with the drop in LDL and ApoB, in a population that had few other options. It's the main outcome evidence behind recommending bempedoic acid rather than just a cholesterol-lowering pill with no proof of preventing events.

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التجربة السريرية هي دراسة يقوم فيها الباحثون بإعطاء مجموعة واحدة علاجاً ومجموعة أخرى دواءً وهمياً أو رعاية قياسية، ثم يقارنون بين ما يحدث.

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When people are assigned randomly, it is the most reliable way we have to find out if something truly works. Observational studies can only watch what people already do, which leaves room for other explanations.

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The gene encoding the enzyme CMP-N-acetylneuraminic acid hydroxylase, which converts Neu5Ac to Neu5Gc in most mammals; humans carry an inactivating mutation in this gene and therefore cannot synthesize Neu5Gc.

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Understanding why humans are uniquely vulnerable to dietary Neu5Gc requires knowing that a single gene mutation set us apart from other mammals.

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A genetically engineered mouse that lacks both the CMAH gene (making it unable to produce Neu5Gc, like humans) and the LDL receptor gene (making it prone to high cholesterol and atherosclerosis); used to study how dietary Neu5Gc and anti-Neu5Gc antibodies affect plaque development.

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This is the key experimental model providing mechanistic evidence that Neu5Gc may accelerate atherosclerosis, so understanding what it is helps evaluate the strength of that evidence.

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زيت جوز الهند هو دهن طهي تم تسويقه كطعام خارق على الرغم من احتواءه على نسبة عالية جداً من الدهون المشبعة.

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Studies consistently show it raises LDL cholesterol, similar to butter. The health-food reputation came from marketing and a few misread studies, not from evidence that it protects your heart.

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A combined measure of a rider's aerodynamic drag, calculated as the product of the drag coefficient and the frontal surface area; a lower CdA means less air resistance and faster speeds for the same power output.

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In an hour record, aerodynamic efficiency can matter as much as raw power—even small reductions in CdA translate to significant distance gains.

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A defined group of patients followed over time under similar conditions; Esselstyn's cohort, for example, consisted of patients with advanced coronary artery disease who agreed to follow a strict plant-based diet.

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Knowing what a cohort is helps readers understand why results from a selected group may or may not generalise to the wider population.

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تتابع دراسة الأتراب مجموعة كبيرة من الناس بمرور الوقت، مسجلةً ما يأكلونه أو يفعلونه وما يحدث لصحتهم بعد سنوات.

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These studies are valuable for spotting patterns, but they cannot prove cause. People who choose a habit usually differ in other ways too, and those differences can be the real explanation.

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الكولشيسين هو دواء قديم رخيص المضاد للالتهابات، استُخدم لقرون في علاج النقرس، والآن يُعاد توجيهه لعриض أمراض القلب.

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It reduces events in people who keep having them despite well-controlled cholesterol. It is the most practical evidence so far that treating inflammation directly adds something.

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COLCOT (Colchicine Cardiovascular Outcomes Trial) was a randomized trial in which low-dose colchicine, an anti-inflammatory drug, was given to patients shortly after a heart attack; it reduced the risk of a subsequent major cardiovascular event by 23% compared with placebo, establishing that targeting inflammation independently of cholesterol lowers cardiovascular risk.

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It is one of the trials showing that fighting inflammation — not just lowering cholesterol — can prevent heart attacks.

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A biochemical process in which collagen fibers within arterial walls form stable chemical bonds between adjacent molecules, reducing tissue elasticity and contributing to irreversible arterial stiffening; it is accelerated by sedentary behavior and advancing age.

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This process explains why the window for reversing arterial stiffness closes after roughly age 65, creating the urgency for midlife intervention.

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Collateral circulation is a network of small backup blood vessels that can grow around a blocked artery, like a detour around a closed road.

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People who develop good collaterals sometimes survive blockages that would otherwise be devastating. Long-term exercise appears to encourage them, which may be one reason very fit people can have severe disease without symptoms.

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Collateral flow index is an invasive measurement obtained during balloon occlusion of a coronary artery that quantifies the proportion of normal antegrade blood flow supplied by collateral vessels. It is used in research to objectively assess how well the heart's backup circulation compensates for a blockage.

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It provides a concrete number for how much protection the 'backup pipes' actually offer, and studies using CFI have shown both the benefits and strict limits of exercise-induced collateral growth.

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Compensatory enlargement, described by Glagov, is the outward expansion of an artery's wall as plaque accumulates inside it, allowing the channel where blood flows to remain relatively open despite substantial hidden disease; on modern CT imaging, this positive remodeling is considered a high-risk plaque feature associated with lipid-rich, potentially vulnerable plaque rather than evidence of hea…

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It explains why a person can carry serious atherosclerosis yet have a nearly normal-looking angiogram — the disease hides in the wall, not the channel.

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The process by which an artery expands its outer diameter to preserve luminal blood flow as plaque accumulates within the vessel wall; luminal narrowing is typically delayed until plaque occupies roughly 40% of the internal elastic lamina area, making early disease invisible to lumen-focused imaging.

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It explains why standard imaging can report 'normal' arteries even when substantial plaque is already present inside the vessel wall.

تعريف

نقطة النهاية المركبة تجمع عدة نتائج مختلفة معاً وتحسب أياً منها يحدث أولاً.

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Bundling makes trials smaller and faster. It can also mislead, because a headline reduction may be driven entirely by the least serious component — more procedures avoided rather than fewer deaths.

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Compositional stabilization refers to a shift in plaque biology away from a lipid-rich, inflamed, rupture-prone state toward a denser, less active state, achieved through ApoB lowering or anti-inflammatory treatment; it reduces the likelihood of a plaque triggering an acute coronary event without necessarily shrinking the total plaque volume visible on imaging.

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It reframes the goal of treatment from 'making plaque disappear' to 'making plaque less dangerous.'

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Compound heterozygous describes a genetic state in which an individual inherits two different pathogenic mutations in the same gene—one from each parent—rather than two copies of the identical mutation; in HoFH, compound heterozygosity for two distinct LDLR mutations still abolishes or severely impairs LDL receptor function and produces the full HoFH phenotype.

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Most HoFH patients are compound heterozygotes rather than true homozygotes, which affects genetic testing strategies and family screening.

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التصوير المقطعي المحوسب، أو (CT)، يلتقط صور بالأشعة السينية من زوايا عديدة ويعيد بناءها لتصبح مقاطع عرضية للجسم.

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It is the technology behind both the calcium scan and CT angiography — the two tests that let doctors see coronary plaque without threading a catheter into an artery.

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Concentration-time exposure, in the context of atherosclerosis, refers to the cumulative dose of ApoB-containing particles that an artery wall has experienced over time — the product of how high the particle level is and how many years it has been elevated — rather than a single snapshot measurement.

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It explains why a person's lifetime cholesterol history matters far more than one test result, and why starting lipid lowering early has such a large long-term benefit.

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A confidence interval is the range of values that are statistically compatible with what a study found.

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It shows how solid a result is. A narrow interval means a precise finding; a wide one that crosses "no effect" means the study could not really tell whether the treatment worked.

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دراسة تسجيلية دولية واسعة النطاق متعددة المراكز شملت مرضى خضعوا لتصوير الشرايين التاجية المقطعي المحوسب، والتي وثقت مدى انتشار والأهمية السريرية لمرض الشريان التاجي — بما في ذلك الأحداث السلبية — حتى بين المرضى الذين كانت درجات الكالسيوم في شرايينهم التاجية تساوي صفراً.

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The CONFIRM data underpin the warning that a zero calcium score can still coexist with dangerous plaque, a finding directly relevant to people with inherited cardiac risk.

تعريف

سجل دولي واسع النطاق يضم أكثر من 6000 مريض، جرى فيه تقييم خصائص لويحات الشرايين التاجية الكمية المدعومة بالذكاء الاصطناعي لمعرفة قدرتها على التنبؤ بالأحداث القلبية الوعائية السلبية الكبرى؛ وأظهر السجل أن تحليل اللويحات المستمد من الذكاء الاصطناعي حسّن مساحة تحت منحنى خصائص تشغيل المستقبل (ROC) للتنبؤ بالأحداث من 0.62 إلى 0.75 مقارنة بالطرق القياسية.

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CONFIRM2 is the primary evidence the article cites that AI-QCT measurably improves risk prediction beyond existing tools.

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المتغير المُربِك هو متغير مرتبط بكل من التعرض المدروس (مثل TMAO) والنتيجة (مثل أمراض القلب)، مما يجعل الأمر يبدو وكأن أحدهما يسبب الآخر بينما يكون هناك عامل ثالث هو المسؤول في الواقع. تُدرج المقالة وظيفة الكلى، ومقاومة الأنسولين، والالتهاب الجهازوي، والعمر باعتبارها عوامل مربكة رئيسية تضخم خطر القلب والأوعية الدموية الظاهري لارتفاع مركب TMAO في...

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Confounding is the central methodological problem that explains why the TMAO-heart disease link looks stronger in some studies than the genetic evidence supports.

تعريف

الخلط الإحصائي هو عندما يجعل عامل خفي ثالث شيئين غير مرتبطين يبدوان مترابطين.

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Classic example: people who take vitamins are healthier. But they also exercise more, smoke less, and see doctors more often. The vitamin gets credit for what those other habits did. Untangling confounding is why good studies are so hard to run.

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Conjugated equine estrogens are a mixture of estrogen compounds derived from horse urine and taken as an oral pill; they were the form of estrogen used in the WHI trial, and unlike bioidentical estradiol, they undergo hepatic first-pass metabolism and raise coagulation factors.

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Distinguishing CEE from modern bioidentical estradiol patches is essential for interpreting the WHI results correctly.

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انكماش متناقض للغشاء المرن الخارجي يمكن أن يرافق تراجع اللويحات، مما يسبب انقباض جدار الوعاء الدموي للداخل بدلاً من تمدده للخارج؛ والنتيجة هي أن حجم اللمعة يظل كما هو أو يتناقص حتى مع انخفاض الحجم الإجمالي للويحات.

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It explains why successful plaque-shrinking therapy does not always widen the artery or relieve symptoms, a counterintuitive finding patients and clinicians need to understand.

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The removal of body heat by the movement of air or fluid across the skin; at altitude the lower air density reduces convective heat loss, raising core temperature and impairing muscle efficiency during exercise.

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Reduced convective cooling at altitude or in hot environments accelerates fatigue and directly limits cardiovascular performance.

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A class of deep-learning architecture designed to detect spatial patterns in image data; in AI-QCT, CNNs are trained on large coronary CT datasets with invasive validation to recognize and classify plaque components automatically.

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CNNs are the computational engine that allows AI-QCT to outperform human readers in identifying high-risk plaque.

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A long-running prospective observational study based at the Cooper Clinic in Dallas that has followed a large cohort of patients over decades and contributed foundational data on the association between family history and coronary heart disease death in men.

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Research from this study is part of the evidence base showing that a family history of cardiac death predicts long-term coronary risk independently of other standard risk factors.

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A large Danish cohort study that analyzed lipid and lipoprotein concentrations in over 13,000 cord blood samples with longitudinal follow-up, providing normative reference data for cholesterol trajectories from birth through the first 14–16 months of life.

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It established that babies reach near-adult LDL-C and ApoB levels far earlier than anyone expected—reframing when cardiovascular risk actually begins.

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دراسه دنماركيه ضخمه قاست الدهون، بما في ذلك ليبوبروتين (أ) والكوليسترول المتبقي، لدى عشرات الآلاف من الأشخاص وتابعت صحتهم لسنوات.

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Denmark's national health records make follow-up unusually complete. Much of what we know about remnant cholesterol and Lp(a) as independent risks comes from this dataset.

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Small membrane-bound transport carriers (typically 60–80 nm in diameter) that bud from the endoplasmic reticulum to ferry newly synthesized proteins to the Golgi apparatus; their limited size means large molecules such as procollagen require specialized machinery like TANGO1 to exit the ER.

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Understanding COPII size constraints explains why the MIA3/TANGO1 pathway is indispensable for collagen secretion and plaque stability.

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CoQ10 is a compound your cells use to help generate energy in the mitochondria. Statins reduce production of it slightly, since it shares a manufacturing pathway with cholesterol.

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It's the basis for a popular but poorly substantiated claim that statins cause fatigue and muscle pain by depleting CoQ10 — a theory sold hard by supplement marketers, though trials haven't shown that supplementing it actually prevents statin symptoms.

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CORDIOPREV compared a Mediterranean diet against a low-fat diet in people who already had coronary disease, following them for seven years.

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It is one of the few long, well-run dietary trials in people with established disease, and it reported fewer events on the Mediterranean pattern.

تعريف

تعد دراسة «كورديوبريف» (CORDIOPREV) تجربة عشوائية محكومة قارنت بين النظام الغذائي المتوسطي ونظام غذائي منخفض الدهون بشكل معتدل (حوالي 28–30% من السعرات الحرارية من الدهون) لدى مرضى مصابين بمرض الشريان التاجي المؤكد؛ وقد أكدت الدراسة تفوق النظام الغذائي المتوسطي على النظام المقارن، لكنها لم تختبر النظام الغذائي منخفض الدهون للغاية (

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It is the main secondary RCT for the Mediterranean diet in patients with existing heart disease, and its limitations in scope are relevant to understanding what the evidence does and does not show.

تعريف

الشريان التاجي هو وعاء دموي صغير يلتف حول الجزء الخارجي من قلبك ويغذي عضلة القلب نفسها.

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They are surprisingly small — roughly the width of a coffee stirrer. When one gets blocked, the muscle it feeds starts to die within minutes.

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CABG is an open-heart surgical procedure in which a surgeon uses a blood vessel harvested from elsewhere in the body—typically a leg vein or chest-wall artery—to create a new route for blood flow around a blocked coronary artery.

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Understanding CABG helps patients grasp why surgery is sometimes recommended over stenting, particularly when multiple arteries are severely diseased.

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إلتهاب الشريان التاجي هو مقياس لترسبات اللويحات المتكلسة في جدران الشرايين التاجية، والتي يتم قياسها بواسطة التصوير المقطعي المحوسب والتعبير عنها بنقاط أغاتستون؛ تشير النقاط الأعلى إلى عبء أكبر من اللويحات التراكمية وتتنبأ بأحداث قلبي وعائية مستقبلية.

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Studies discussed in the article use CAC as the primary marker showing that lifelong endurance athletes can have paradoxically high plaque burden.

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A non-contrast, ECG-gated CT scan that detects and quantifies calcified plaque in the coronary arteries; the resulting Agatston score reflects the extent of coronary calcification and serves as a direct, disease-based measure of atherosclerotic burden rather than a statistical estimate of risk.

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Understanding what the score actually measures—and what it can miss—is essential for interpreting your own results or those of a fit, seemingly healthy patient.

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A coronary artery calcium score, or CAC score, comes from a quick CT scan that measures how much hardened plaque is in your heart's arteries. No dye, no needles, about ten minutes.

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A score of zero is genuinely reassuring for most middle-aged people. A high score means real disease is present, even if you feel perfectly fine. It is one of the few tests that can show you your disease instead of just estimating your odds.

تعريف

مرض الشريان التاجي هو تراكم اللويحات في الشرايين التي تغذي عضلة القلب.

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It is the most common form of heart disease and the usual cause of heart attacks. It builds silently for decades, which is why the first symptom for many people is also a serious event.

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An abnormal, pathological dilation of a coronary artery segment beyond 1.5 times the diameter of an adjacent normal segment; the article explicitly rules it out as an explanation for the observed vessel widening in the Megdal angiograms, confirming the enlargement reflects true regression rather than disease-related over-expansion.

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Distinguishing healthy regression from ectasia ensures the 'wider pipe' seen in the 2018 images is good news, not a different problem.

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Narrowing of a coronary artery lumen, typically caused by atherosclerotic plaque, which reduces blood flow to the heart muscle; measured as a percentage of the original vessel diameter.

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Stenosis is the structural abnormality that lifestyle trials aim to reduce, so knowing the term helps readers interpret claims about 'reversal.'

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A measurable reduction in the size or severity of atherosclerotic plaque within the coronary arteries, confirmed by imaging; the Ornish Lifestyle Heart Trial demonstrated regression after one year on a low-fat plant-based diet, with further improvement at five years.

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Regression—rather than mere slowing of progression—is the gold standard outcome that distinguishes the most effective cardiovascular interventions.

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A coronary care unit is a specialised hospital ward where heart-attack patients are continuously monitored for dangerous heart rhythms and can be defibrillated immediately if one occurs. Introduced in the early 1960s, it was the single biggest step forward in acute heart-attack survival before modern drugs arrived.

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The CCU demonstrated that continuous monitoring and rapid defibrillation — not drugs or surgery — drove the first major improvement in surviving a heart attack.

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Coronary CT angiography, or CCTA, is a CT scan done with dye in your veins that produces detailed pictures of your heart's arteries.

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Unlike a calcium scan, it can see soft plaque as well as hard plaque, and unlike an invasive angiogram it requires no catheter. It shows both how narrow an artery is and what the plaque is made of.

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Coronary flow reserve compares blood flow through the heart's arteries at rest with flow when the heart is working hard.

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A poor result with clear large arteries points to trouble in the tiny vessels instead — a real and often missed cause of chest pain, especially in women.

تعريف

مرض الشريان التاجي هو تضيق أو انسداد الشرايين التي تغذي عضلة القلب بالدم، والذي يحدث بسبب تراكم اللويحات تصلب الشرايين؛ وهو السبب الرئيسي للنوبة القلبية والوفاة القلبية في جميع أنحاء العالم.

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It is the underlying condition the entire article is about, and knowing its formal name helps readers follow medical sources and statistics.

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التقنيات غير الغازية أو الغازية - مثل تصوير الأوعية التاجية الكمي أو الموجات فوق الصوتية داخل الأوعية - المستخدمة لتصور حجم وطبيعة اللويحات داخل الشرايين التاجية؛ يُعد عمل أورنيش وإسيلستين بارزاً لاستخدامه التصوير الشرياني الموضوعي بدلاً من الاعتماد فقط على بيانات الأعراض أو الأحداث.

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Regression of atherosclerosis demonstrated by imaging carries more direct mechanistic weight than event counts alone, which is why the article emphasises it.

تعريف

اضطراب الأوعية الدقيقة التاجية هو خلل في وظيفة الشرايين الدقيقة والشعيرات الدموية التي تغذي عضلة القلب، مما ينتج عنه انخفاض تدفق الدم وعدم تحمل التمارين الرياضية حتى عندما تبدو الشرايين التاجية الرئيسية طبيعية في تصوير الأوعية.

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CMD can cause symptoms and limit performance in older athletes whose large-artery tests come back clean, making it an easy-to-miss contributor to exercise intolerance.

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Coronary thrombosis is the formation of a blood clot inside a coronary artery, blocking blood flow to the heart muscle — the underlying event in most heart attacks. It was first described as a recognisable clinical syndrome in a living patient in 1912.

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Understanding that a clot, not just a diseased artery, triggers the acute event explains why clot-dissolving drugs and antiplatelet therapies became central to heart-attack treatment.

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A sudden, intense, transient constriction of an epicardial coronary artery severe enough to halt blood flow and cause myocardial ischemia or infarction, which typically resolves before angiography is performed, leaving an apparently normal-looking vessel.

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Vasospasm is one of the key 'invisible' causes of MINOCA—it causes real heart damage yet leaves no lasting obstruction for standard tests to detect.

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The cortisol awakening response (CAR) is the sharp rise in cortisol that normally occurs in the 30–45 minutes after waking, and is used as a measure of how well the HPA axis is functioning. The article notes that in Whitehall II the CAR did not predict cardiovascular mortality, whereas a flatter diurnal cortisol slope did.

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Understanding what cortisol patterns actually matter — and which ones don't — helps you evaluate claims about stress hormones and heart risk.

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The Clinical Outcomes Utilizing Revascularization and Aggressive Drug Evaluation trial randomized 2,287 patients with stable coronary artery disease to PCI plus optimal medical therapy or medical therapy alone, finding no significant difference in death or heart attack rates over up to 15 years of follow-up.

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It is the landmark study showing that stents do not help most stable heart disease patients live longer than medication and lifestyle changes alone.

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COVID-19 infection is associated with transient reductions in cardiopulmonary fitness, VO₂ max, and muscular endurance; even after acute illness resolves, residual fatigue and reduced aerobic capacity can persist for weeks and pose risks if high-intensity exercise is resumed prematurely.

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Returning to strenuous exercise after COVID-19 carries specific cardiovascular risks, including myocarditis, that are important for heart health readers to understand.

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COX-1 is an enzyme found in platelets that produces thromboxane A₂, a chemical that promotes platelet clumping and blood vessel narrowing; aspirin permanently blocks COX-1 by chemically modifying a specific site (Ser-530) in the enzyme, which is the molecular basis of aspirin's antiplatelet effect.

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Knowing what COX-1 does clarifies exactly how aspirin prevents clots—and why its inhibition carries both benefit and bleeding risk.

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An involuntary, painful muscle contraction that can occur during prolonged maximal exercise, often associated with fatigue and electrolyte shifts; in the article, Megdal begins cramping in the final minutes of his hour-long maximal effort.

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Muscle cramping near peak exertion is a signal of physiological stress relevant to anyone pushing cardiovascular limits during exercise.

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An enzyme released into the bloodstream when muscle cells are damaged; elevated CK levels are used as a biomarker of skeletal muscle injury, and statin use—especially around intense exercise—can raise CK beyond the elevation caused by training alone.

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The key lab marker used to distinguish statin-related muscle damage from normal exercise-induced soreness in athletes.

تعريف

تجربة مستقبلية شملت 513 مريضاً قارنت بين تحليل تصوير الشرايين التاجية المقطعي المحوسب المدعوم بالذكاء الاصطناعي وتصوير الأوعية التاجية الكمي الغازي وقياس الاحتياطي الجزئي للتدفق، مما أظهر توافقاً عالياً ودعم استخدام تحليل الشرايين التاجية الكمي بالذكاء الاصطناعي كبديل غير غازي قابل للتطبيق لتقييم نقص التروية عن طريق القسطرة.

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CREDENCE directly validates that an AI scan can replace expensive, invasive procedures for judging whether a blockage is flow-limiting.

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A precision gene-editing technique that chemically converts a single DNA base (letter) in the genome to another without cutting the double strand, enabling permanent and targeted changes to a gene's function; in cardiovascular research it has been used in primates to permanently silence the PCSK9 gene in liver cells, producing lasting LDL reductions from a single treatment.

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Base editing is the mechanism behind the 'one-and-done' gene therapy approach that could eventually eliminate the need for any ongoing cholesterol medication.

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A mass-start bicycle road race contested on a short, closed circuit—typically a city block or similar loop—requiring repeated tight cornering and making crash risk substantially higher than open-road events.

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Understanding the format explains why finishing safely in a criterium is itself an achievement, separate from placing well.

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In the context of health literacy, the disciplined habit of questioning the source, funding, and methodology behind medical claims before accepting them as fact.

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Without it, patients are vulnerable to conflicting headlines and commercially motivated health advice.

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A cross-sectional study takes a single snapshot of a population at one moment.

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It can show that two things occur together but never which came first. Studies of this kind are frequently reported as if they showed cause, and they cannot.

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A non-invasive imaging test that uses computed tomography with intravenous contrast to produce detailed three-dimensional pictures of the coronary arteries, revealing both calcified and non-calcified (soft) plaque as well as luminal narrowing; it offers more information than a calcium score alone.

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The article specifically recommends CT angiography over a calcium score because it detects soft plaque that a calcium scan would miss.

تعريف

CT coronary angiography (also called coronary CT angiography or CCTA) is a non-invasive imaging test that uses a CT scanner and injected contrast dye to produce detailed images of the coronary arteries, revealing both calcified and non-calcified (soft) plaques as well as the degree of any narrowing.

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Unlike a calcium scan, it shows the type and texture of plaque, helping identify unstable lesions that pose the greatest rupture risk.

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CT-FFR is a non-invasive technique that applies computational fluid dynamics to coronary CT angiography data to estimate the functional significance of a coronary stenosis without an invasive catheter. It helps determine whether an anatomical narrowing seen on imaging is actually restricting blood flow enough to cause ischemia.

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For athletes with high calcium scores or detected plaques, CT-FFR can clarify whether a narrowing is truly dangerous during peak-effort exercise.

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The Cholesterol Treatment Trialists' Collaboration pools the raw data from every major statin trial rather than just comparing published summaries.

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With hundreds of thousands of patients, it produced the central finding of modern lipid care: each unit of LDL reduction buys a roughly proportional reduction in events, no matter how you achieve it.

تعريف

The specific site within a coronary artery identified as the originating source of the acute ischemic event, which in MINOCA may represent plaque disruption, erosion, thrombus, or dissection detectable by intracoronary imaging even when angiography appears unobstructed.

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Identifying the culprit lesion is crucial for directing the correct treatment in MINOCA rather than applying a one-size-fits-all approach.

تعريف

التعرض التراكمي هو الإجمالي الكلي لجزيئات الكوليسترول الضارة التي غرقت فيها شرايينك طوال حياتك - أي مدى ارتفاع مستواها، مضروباً في مدة استمرارها.

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This is the single most important idea on this site. Someone with a moderately high level since age 20 can end up with more damage than someone with a very high level starting at 55. Plaque adds up. Starting earlier matters more than starting harder.

تعريف

Curing a disease means stopping the process that causes it. Reversing means undoing damage that has already been done. They are not the same thing.

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With heart disease you can stop the process almost completely by driving particle levels low enough. Undoing the existing plaque is slower and only partial. Being clear about which one is being promised matters a great deal when reading health claims.

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Cynomolgus macaques (Macaca fascicularis) are Old World monkeys highly sensitive to dietary cholesterol that rapidly develop advanced coronary lesions rich in collagen, elastin, and calcification; they have also been used to study how psychosocial stress and social hierarchy accelerate coronary atherosclerosis through sympathetic nervous system activation and elevated cortisol.

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They illustrate that stress hormones, not just diet, can drive plaque development—relevant to anyone asking whether psychological stress affects heart risk.

تعريف

CYP7A1 (cholesterol 7-alpha-hydroxylase) is the rate-limiting liver enzyme that initiates the conversion of cholesterol to bile acids, representing the primary route by which the body eliminates cholesterol. Because the sterol ring cannot be broken down for energy, this hepatic conversion to bile acids is the main disposal mechanism.

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Drugs and dietary factors that upregulate CYP7A1 activity can lower circulating cholesterol by increasing its conversion to bile acids for excretion.

تعريف

The enzyme that catalyzes the first step of transsulfuration, converting homocysteine to cystathionine with vitamin B-6 as a cofactor; inherited loss-of-function mutations in the CBS gene are the most common cause of classical homocystinuria and severe hyperhomocysteinemia.

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CBS deficiency is the clearest proof that extremely high homocysteine damages arteries, making it central to understanding why the mild-range evidence looks so different.

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A randomized trial of dalcetrapib, a CETP inhibitor that raised HDL-cholesterol, which found no reduction in cardiovascular events after acute coronary syndrome, contributing to evidence that pharmacologically increasing HDL-C does not reliably translate into clinical benefit.

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One of several trials showing that HDL elevation alone does not cancel out cardiovascular risk—directly undermining a key defense of coconut oil.

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A landmark longitudinal study that measured cardiovascular changes in healthy young men after prolonged bed rest and then after exercise training; its 30-year follow-up showed that just 20 days of bed rest impaired cardiovascular capacity more than three decades of normal aging in the same individuals.

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It is the foundational evidence that much of what we call heart aging is actually reversible deconditioning, not inevitable decline.

تعريف

The DASH (Dietary Approaches to Stop Hypertension) diet is a dietary pattern emphasizing fruits, vegetables, whole grains, low-fat dairy, and reduced sodium and saturated fat, originally developed and tested in randomized trials for its blood-pressure-lowering effects and subsequently studied for broader cardiovascular benefit.

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It is one of the major named dietary patterns compared in evidence reviews of heart disease prevention.

تعريف

De novo lipogenesis is your liver manufacturing fat from scratch, mostly out of excess carbohydrate.

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It is how a very high sugar or refined starch intake ends up raising triglycerides and depositing fat in the liver, even when you are not eating much fat.

تعريف

De novo synthesis refers to the construction of a molecule—here cholesterol—entirely from scratch within the cell, starting from small precursors such as acetyl-CoA, rather than acquiring it from the bloodstream or diet. The roughly 30-step pathway is so energetically costly that cells strongly prefer to take up circulating LDL when it is available.

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Understanding whether a patient overproduces cholesterol or over-absorbs it determines which treatment—a statin or ezetimibe—is likely to work best.

تعريف

A type of machine-learning model with many layers of interconnected processing nodes that learns complex, non-linear patterns from large datasets; in cardiac imaging it is trained to detect and quantify plaque features on CT scans.

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DNN-based analysis underlies the high diagnostic AUC figures quoted in the article and is the technical engine behind AI-assisted coronary plaque reading.

تعريف

The dependency threshold is an informal term for the VO₂ max level—roughly 18–20 mL·kg⁻¹·min⁻¹—below which a person lacks sufficient cardiorespiratory reserve to perform basic activities of daily living independently.

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Knowing this threshold illustrates the direct link between measurable fitness and functional independence in old age.

تعريف

Descending inhibitory pathways are neural circuits that originate in the brainstem and travel down the spinal cord to suppress pain signal transmission before it reaches conscious awareness. They are a key component of exercise-induced hypoalgesia and are strengthened by chronic endurance training.

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They form part of the biological mechanism that elevates an athlete's pain threshold, potentially silencing the cardiac pain that should prompt urgent medical attention.

تعريف

A long-chain omega-3 fatty acid with six double bonds that increases membrane fluidity and disorder; unlike EPA, it does not appear to inhibit oxidation of ApoB-containing lipoprotein particles and was not associated with cardiovascular event reduction in mixed EPA/DHA trials.

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Distinguishing DHA from EPA helps explain why combination omega-3 supplements failed where purified EPA succeeded.

تعريف

مرض السكري هو حالة يبقى فيها سكر الدم مرتفعاً للغاية، إما لأن الجسم ينتج كمية قليلة جداً من الإنسولين أو لأنه يتوقف عن الاستجابة للإنسولين الذي ينتجه.

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It roughly doubles heart disease risk. Part of that is the sugar damaging blood vessels, and part is that diabetes usually comes bundled with high triglycerides and a high particle count that a standard cholesterol test can miss.

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Diabetic retinopathy is damage to the small blood vessels in the retina caused by chronically elevated blood sugar; research has shown that ApoB particles can leak through the damaged blood-retinal barrier and deposit as 'hard exudates,' analogous to arterial plaque.

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It highlights that controlling ApoB particle burden matters for preserving vision, not just preventing heart attacks.

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Diameter stenosis is an angiographic measure of how much a coronary artery's lumen has been narrowed by plaque, expressed as a percentage of the vessel's original diameter; it is used in clinical trials as an objective marker of plaque progression or regression.

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It is the key measurement used to confirm whether a dietary intervention actually shrinks arterial plaque rather than just improving blood markers.

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Diastolic blood pressure is the bottom number in a blood pressure reading. It is the pressure in your arteries while the heart is relaxing between beats.

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In younger adults it is often the more meaningful of the two numbers. In older adults, the top number usually matters more because arteries have stiffened.

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Dietary cholesterol is the cholesterol in food — eggs, shrimp, liver, and other animal products.

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For most people it has a surprisingly small effect on blood cholesterol, because the body compensates by making less. Saturated fat in food generally raises blood cholesterol more than cholesterol in food does. This is why egg advice kept flip-flopping for decades.

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A pattern of atherosclerosis regression in which luminal widening occurs broadly across an entire arterial segment rather than only at a single focal stenosis; the Megdal study documents this via Average Lumen Diameter improvement between the standardized red tick marks on both the LAD and Circumflex, ruling out focal mechanical intervention as the cause.

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Diffuse reversal proves the whole artery wall is healing, not just one spot that might have been stented.

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كانت دراسة DISCO-CT تجربة تصوير عشوائية أضافت نظاماً غذائياً يركز على نظام داش (DASH) وبرنامجاً لنمط الحياة إلى العلاج الطبي الأمثل وقاسَت اللويحات التاجية باستخدام التصوير المقطعي المحوسب؛ ووجدت الدراسة عدم وجود فروق في عبء اللويحات الإجمالي بين المجموعات، ولكنها لاحظت انخفاضاً أكبر في مكون اللويحات غير المتكلسة المُعرّف على نطاق واسع في مجموعة النظام الغذائي.

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It is one of the few controlled trials to look at whether diet changes actual plaque on a CT scan, and its mixed results illustrate how hard that question is to answer.

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راجع اختلاف أوب لت الاطلاع على المُدخل الكامل.

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A process in which measurable markers of cardiovascular disease—such as arterial plaque burden or coronary stenosis—improve significantly in response to intensive lifestyle modification, nutrition, and/or medical therapy, to the point where the disease no longer produces symptoms or detectable progression.

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Distinguishing reversal from mere stabilization is important for patients setting realistic goals for lifestyle and medical intervention.

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The diurnal cortisol slope is the rate at which cortisol falls from its morning peak to its evening low over the course of a day. A flatter slope — meaning cortisol stays too high into the evening — has been associated in some studies with worse cardiovascular outcomes, including cardiovascular mortality in the Whitehall II cohort.

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It shifts the conversation from 'is my cortisol high?' to 'is my cortisol rhythm healthy?' — a more meaningful question for heart health.

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DMB (3,3-dimethyl-1-butanol) is a naturally occurring compound found in some olive oils that acts as a competitive inhibitor of the microbial TMA lyase enzyme (CutC/D), reducing TMA and TMAO production without killing gut bacteria and thereby avoiding the risk of antibiotic resistance.

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DMB represents a new class of targeted, non-antibiotic interventions that could lower cardiovascular risk by modulating the microbiome.

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An epigenetic biological-age model that integrates DNA methylation patterns with measures of cardiorespiratory fitness to estimate how physiologically 'young' an individual is relative to their chronological age.

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It offers a way to quantify the anti-aging effect of high fitness levels beyond simple performance metrics.

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A guanine nucleotide exchange factor that is recruited to the cytoplasmic domain of SR-B1 following LDL binding, and activates the small GTPase Rac1 to trigger actin cytoskeleton remodeling required for endothelial transcytosis of LDL particles.

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DOCK4 is a key link in the molecular chain that moves LDL from the bloodstream into the artery wall—blocking any step in this chain could reduce plaque formation.

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Donanemab is an anti-amyloid monoclonal antibody that targets a modified form of amyloid-beta and, like lecanemab, has been shown to remove plaques and modestly slow Alzheimer's progression in clinical trials, with similar risks of brain swelling and bleeding.

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Alongside lecanemab, it confirms amyloid removal is achievable but not curative, reinforcing the case that other upstream causes — including vascular disease — must be addressed.

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The Danish Osteoporosis Prevention Study (DOPS) was a randomized trial in which women who had just started menopause took oral hormone therapy for ten years; at follow-up, the hormone group had roughly half the rate of major cardiovascular events or death compared with the placebo group, providing one of the strongest hard-outcome signals for early hormone initiation.

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DOPS is one of the few randomized trials reporting actual heart attacks and deaths as endpoints, not just surrogate measures.

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تعني العلاقة بين الجرعة والاستجابة أن زيادة كمية الشيء تؤدي إلى زيادة التأثير، بدرجة متسقة.

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It is one of the classic signs that a relationship is causal rather than coincidental. LDL and heart disease show it clearly: the higher and the longer, the more plaque.

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تصف علاقة الجرعة بالاستجابة كيف يتغير حجم التأثير البيولوجي مع زيادة مقدار التعرض (مثل دقائق التمرين الأسبوعية)؛ في هذه المقالة، يُظهر تدريب المقاومة علاقة غير خطية بين الجرعة والاستجابة للوفيات، حيث تتسطح الفوائد عند حوالي 120 دقيقة أسبوعياً وتظهر منحنى على شكل حرف J عند الأحجام العالية جداً لدى النساء المسنات.

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Knowing that 'more is not always better' is one of the article's central practical messages.

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A DPP-4 inhibitor is an oral medication that blocks the enzyme dipeptidyl peptidase-4, which normally degrades the body's own GLP-1; by slowing GLP-1 breakdown, these pills raise endogenous GLP-1 levels by only two- to threefold — far less than injectable GLP-1 receptor agonists — and large trials such as SAVOR-TIMI 53 found they do not reduce cardiovascular events.

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The article uses DPP-4 inhibitors to explain why the dose and potency of GLP-1 activation matters for heart protection, not just the drug class.

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A urine or blood sample collected by officials after a competition to screen for prohibited performance-enhancing substances under the rules of the governing body; athletes setting national or world records are routinely tested to validate the result.

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Anti-doping testing ensures that record performances reflect genuine cardiovascular and physiological capacity rather than pharmacological enhancement.

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A drug-eluting stent is a small metal mesh tube coated with a medication that is inserted into a narrowed coronary artery to hold it open; the drug coating slowly releases an agent that inhibits scar tissue growth inside the stent, reducing the risk of the vessel re-narrowing.

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DES are the modern stents used in the trials discussed here; understanding their design helps explain why they were expected to outperform earlier bare-metal stents in preventing re-blockage.

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The combined use of two platelet-inhibiting drugs—typically aspirin and clopidogrel—prescribed after stent implantation to prevent clot formation inside the stent, usually continued for approximately six months after a drug-eluting stent procedure.

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DAPT is essential after stenting but carries its own risk of serious bleeding, illustrating the ongoing trade-offs patients and physicians must weigh.

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A dual GIP/GLP-1 receptor agonist is a drug — tirzepatide being the leading example — that simultaneously activates receptors for both glucagon-like peptide-1 and glucose-dependent insulinotropic polypeptide, two incretin hormones, producing greater weight loss, lipid improvement, and metabolic benefit than GLP-1 receptor agonism alone.

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Knowing that tirzepatide targets two receptors explains why its weight-loss and metabolic effects often exceed those of older GLP-1 drugs.

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Dyslipidemia is the medical word for an unhealthy pattern of fats in the blood. It can mean high LDL, high triglycerides, low HDL, or some combination.

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The word describes a pattern rather than one number, which is why treatment depends on which part is off and why.

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يحدث إنهاء التجارب المبكر عندما يتم إيقاف دراسة سريرية قبل نقطة نهايتها المخطط لها، وغالبًا ما يكون ذلك بسبب ظهور بيانات مؤقتة تؤيد العلاج بقوة؛ ويميل هذا الإجراء إلى تضخيم الحجم الظاهري لتأثيرات العلاج وتقليل موثوقية النتائج.

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PREDIMED was stopped early, which is one reason the article argues its reported 30% risk reduction should be interpreted with caution.

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A prospective neurocognitive substudy of the FOURIER trial that used objective cognitive testing in nearly 2,000 patients to assess whether evolocumab-driven LDL lowering affected memory or cognition, finding no meaningful difference versus placebo over a median follow-up of 19 months.

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It is the most direct clinical trial evidence on whether very low LDL harms brain function.

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Eccentric remodeling is the adaptive enlargement and strengthening of the heart's ventricular walls that occurs in response to sustained aerobic exercise, resulting in a larger stroke volume and greater cardiac output; it is distinct from the pathological enlargement seen in heart disease.

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This healthy structural change is a key reason fit people have greater cardiac reserve and lower mortality risk.

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A CT imaging technique that synchronizes image acquisition to the electrical signal of the heart recorded by an electrocardiogram, minimizing motion blur so that coronary structures can be measured accurately; it is the standard method for CAC scoring.

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ECG gating is what allows the scanner to capture sharp images of constantly moving coronary arteries.

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An echocardiogram is an ultrasound picture of your heart. A technician moves a probe across your chest and sound waves build a moving image of the chambers and valves.

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It shows how well the heart is pumping and whether the valves are working. It does not show plaque in the coronary arteries, so a normal echo does not mean your arteries are clear.

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Ectopic fat refers to lipid deposits that accumulate in organs not designed for fat storage — including the liver, pancreas, skeletal muscle, and myocardium — causing local lipotoxicity and impairing organ function when subcutaneous storage capacity is overwhelmed.

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Fat in the liver or heart muscle is directly harmful to those organs in ways that fat under the skin is not.

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A measure of the total afterload—the resistance and pressure load—that the left ventricle must overcome to eject blood into the aorta; as central arteries stiffen with age or inactivity, Ea rises, forcing the heart to work harder with each beat.

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Rising afterload from stiff arteries is a key pathway to heart failure, so understanding Ea explains why arterial stiffness matters beyond just blood pressure.

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الحد الأدنى للفترة الزمنية بعد النبضة الكهربائية التي لا يمكن خلالها إعادة تحفيز الأنسجة القلبية؛ الكحول يقصر بشكل حاد فترة الجهد الفعالة الأذينية، لا سيما في الأوردة الرئوية، مما يجعل القلب أكثر عرضة للدوائر الكهربائية إعادة الدخول التي تكمن وراء الرجفان الأذيني.

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Shortening of this period is a key electrical mechanism by which even modest alcohol exposure raises arrhythmia risk.

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البلعمة الموتية هي عملية تدبير منزلي تقوم من خلالها الخلايا المناعية بإزالة الخلايا الأخرى التي ماتت.

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Inside a plaque this cleanup fails. Dead foam cells pile up instead of being removed, and that debris becomes the necrotic core. Restoring the cleanup is an active area of drug research.

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The epidermal growth factor-like repeat A domain of the LDL receptor to which PCSK9 binds; this binding targets the receptor for lysosomal degradation rather than recycling, and is the molecular site interrupted by PCSK9 inhibitor drugs.

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Knowing the precise binding site clarifies how both monoclonal antibodies and CRISPR-based therapies disrupt PCSK9's action.

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eGFR is a calculated measure of how efficiently the kidneys filter waste from the blood; because TMAO is cleared almost entirely by the kidneys, a falling eGFR causes TMAO to accumulate in the bloodstream independent of diet or gut bacteria. The article identifies reduced eGFR as the single largest confounder in studies linking high TMAO to cardiovascular events.

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Without accounting for kidney function, studies can wrongly conclude that TMAO itself causes heart disease.

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Ejection fraction is the percentage of blood the main pumping chamber squeezes out with each beat. A normal value is somewhere around 55 to 70 percent.

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A low number means the heart is not pumping strongly, often after a heart attack or from long-standing high blood pressure.

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Elastin is a structural protein in the arterial wall that allows blood vessels to stretch and recoil with each heartbeat; with age it degrades and is replaced by stiffer collagen, contributing to arterial stiffening and rising systolic blood pressure.

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Understanding elastin explains why arteries naturally stiffen with age and why blood pressure patterns change after 60.

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An electrocardiogram — ECG or EKG — records your heart's electrical activity through stickers placed on your skin. It takes about a minute and is painless.

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It can reveal rhythm problems, signs of a current or past heart attack, and some inherited electrical conditions that put young athletes at risk. It is a normal-looking test in many people who still have significant plaque.

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A cardiologist subspecialist who focuses on the electrical system of the heart, diagnosing and treating arrhythmias; responsible for performing catheter ablation and managing AF in athletes.

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The article repeatedly directs athletes to seek individualized care from an electrophysiologist.

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The ELITE trial (Early versus Late Intervention Trial with Estradiol) was a randomized trial of 643 women that tested whether starting oral estradiol early (fewer than six years after menopause) versus late (ten or more years after) produced different effects on carotid artery wall thickening; it found slower CIMT progression only in the early-initiation group, providing surrogate-level support f…

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ELITE is the most direct randomized evidence for why starting hormones near menopause may matter for vascular health.

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An emergency action plan is a written, practiced plan for what happens if someone collapses at a school, gym, or sporting event: who calls 911, who starts CPR, and who runs for the defibrillator.

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Places with a rehearsed plan save dramatically more lives than places that simply own a defibrillator. Having the equipment is not the same as knowing what to do with it.

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The endocannabinoid system is a network of endogenous lipid signaling molecules and their receptors (including cannabinoid receptors CB1 and CB2) that modulates pain, mood, and energy balance throughout the nervous system. Research now indicates it plays a central role in exercise-induced hypoalgesia, with the runner's high depending on cannabinoid receptor signaling rather than opioid receptors…

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It is a key reason why an athlete's natural pain-blocking ability is so powerful—and why that ability can mask cardiac warning signals during exercise.

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Cellular mechanisms by which material outside the cell is engulfed in vesicles (endocytosis) and processed through lysosomes; in this context, the route by which dietary Neu5Gc enters human cells and is incorporated into cell-surface structures.

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Explains how a sugar from food physically becomes part of your own tissues, which is the biological basis of the Neu5Gc concern.

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الطبقة الرقيقة من الخلايا التي تبطن السطح الداخلي لجميع الأوعية الدموية؛ وهي تنظم التوتر الوعائي، وتمنع التجلط، وتتحكم في مرور المواد إلى جدار الشريان — ويُعد خلل وظيفتها خطوة مبكرة وحاسمة في الإصابة تصلب الشرايين.

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The study's central mechanism hinges on microplastics injuring these cells, triggering inflammation and plaque growth.

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Endothelial dysfunction is when that thin lining stops doing its job well. Vessels don't widen properly, and the barrier gets leakier.

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It is one of the earliest changes in heart disease, showing up long before any plaque is visible on a scan. Smoking, high blood pressure, high blood sugar, and high particle counts all damage it.

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قدرة البطانة الداخلية للأوعية الدموية على تنظيم توتر الأوعية الدموية، والالتهاب، والتجلط؛ حيث تطلق خلايا البطانة السليم أكسيد النيتريك للحفاظ على استرخاء الشرايين ومقاومتها لتكون اللويحات.

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Impaired endothelial function is an early, reversible step in atherosclerosis, making it a key target of diet and exercise interventions.

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The endothelial glycocalyx is a thin, gel-like layer of glycoproteins and proteoglycans lining the inner surface of blood vessels; it acts as a selective barrier that limits direct contact between circulating lipoproteins and the arterial wall, and is vulnerable to disruption by disturbed or high-velocity blood flow.

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The article proposes that decades of intense exercise may 'shed' this protective coating at arterial bends, allowing ApoB-containing particles to enter the wall and initiate plaque.

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Endothelial nitric oxide synthase is the enzyme in artery-lining cells responsible for producing nitric oxide, which relaxes blood vessels and suppresses clot formation; in insulin resistance, impaired insulin-receptor signaling downregulates eNOS, reducing nitric oxide availability and promoting an adhesive, pro-inflammatory arterial surface.

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Reduced eNOS activity is a key reason insulin resistance damages blood vessels beyond just altering cholesterol particles.

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Bone-marrow-derived precursor cells that circulate in the bloodstream and home to sites of endothelial injury, where they participate in re-endothelialization and microvascular repair; their mobilization is enhanced by statins, aerobic exercise, and whole-food plant-based nutrition.

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They represent one mechanism by which lifestyle and pharmacologic therapy restore the artery's inner lining, reducing future plaque vulnerability.

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Endothelial vasomotor response is the capacity of the arterial inner lining to release signals—chiefly nitric oxide—that cause the vessel to relax and expand; this function is impaired in atherosclerosis and was shown in primate studies to partially recover relatively early in cholesterol-lowering treatment.

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Recovery of this response is one reason risk falls before plaques visibly shrink, making it important for understanding the timeline of benefit.

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The process by which a single layer of endothelial cells grows to cover the inner surface of a stent, restoring a natural lining to the artery wall and reducing the risk of clot formation on the exposed metal.

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Incomplete endothelialization is a key reason clots can form years after stent implantation, making it central to long-term stent safety.

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ال بطانة الأوعية الدموية هي الغشاء الدقيق جداً والزلق الموجود على الجدار الداخلي لكل وعاء دموي. وهي بسمك خلية واحدة فقط.

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It is far more than a coating. It controls how much your vessels relax or tighten, keeps blood from clotting where it shouldn't, and decides what gets through into the wall. When it stops working properly, cholesterol particles slip in more easily.

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The number of calories per gram (or per unit volume) of a food; high-fibre, water-rich plant foods have low energy density, meaning larger volumes can be eaten for fewer calories, promoting satiety and spontaneous calorie reduction without deliberate restriction.

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The article identifies low energy density as a key mechanism by which whole-food plant-based diets facilitate weight loss and metabolic improvement.

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A dysfunctional state of endothelial nitric oxide synthase in which the enzyme produces superoxide rather than nitric oxide, amplifying oxidative stress and reducing vasodilatory capacity; it is reversed as tetrahydrobiopterin availability is restored during plaque regression.

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It explains why oxidative stress directly impairs the artery's ability to relax and why restoring eNOS function is a key goal of both dietary and pharmacologic therapy.

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A long-chain omega-3 fatty acid found in marine oils that, in purified form, inhibits oxidation of ApoB-containing lipoprotein particles and exerts anti-inflammatory effects on the arterial wall; it differs structurally and biologically from DHA.

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Knowing that EPA and DHA are distinct molecules with different effects explains why only certain fish-oil formulations showed cardiovascular benefit in trials.

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A large UK-based prospective cohort that recruited a substantial proportion of vegetarians and vegans, forming part of the broader European Prospective Investigation into Cancer and Nutrition; it reported higher total stroke risk—driven by hemorrhagic stroke—among vegetarians compared with meat-eaters.

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EPIC-Oxford is one of the main sources of evidence that vegetarian diets are not universally protective for all cardiovascular outcomes, particularly stroke.

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الشرايين التاجية النخاعية هي الشرايين الكبيرة السطحية التي تمتد على طول الجزء الخارج من القلب وتعمل بمثابة القنوات الرئيسية التي تزوّد عضلة القلب بالدم؛ وهي الأوعية التي تتراكم فيها اللويحات تصلب الشرايين بشكل أساسي والتركيز الأساسي لدراسات التصوير التاجي.

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The article discusses how these specific vessels are exposed to unique mechanical forces during exercise and where athlete-specific plaque accumulation is detected on imaging.

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علم الأوبئة هو دراسة أنماط الصحة في مجموعات كبيرة من الناس — من يمرض، وأين، وما الذي كان مشتركاً بينهم.

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It generates most of the diet headlines you see. It is genuinely useful for spotting clues, but on its own it cannot prove that one thing caused another.

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A heritable chemical modification—specifically the addition of methyl groups to DNA promoter regions—that alters gene expression without changing the DNA sequence; in fetal aortas exposed to maternal hypercholesterolemia, altered methylation of regulatory regions including those controlling SREBP2 is associated with early atherosclerotic lesion formation.

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It provides a molecular mechanism explaining how a mother's cholesterol can permanently change how her child's body regulates its own cholesterol.

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In the cardiovascular context, erectile dysfunction is recognized as an early clinical manifestation of systemic endothelial and microvascular disease, because the penile arteries (1–2 mm diameter) reach a symptomatic threshold of narrowing several years before the larger coronary arteries (3–4 mm) do. Studies cite ED as an approximately 3-to-5-year warning sign preceding coronary events in men w…

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Recognizing ED as a potential vascular warning rather than an isolated problem can prompt life-saving cardiovascular screening years before a heart attack.

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Any nutritional, pharmacological, or physical intervention intended to enhance athletic performance beyond normal capacity; the term is used to evaluate whether a supplement like exogenous ketones provides a proven competitive advantage.

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The term appears without definition when the article questions whether ketone drinks are 'universally proven ergogenic aids.'

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جهاز قياس الجهد البدني (إرجوميتر) هو جهاز تمرن ثابت -عادة ما يكون دراجة أو سيراً كهربائياً- يُستخدم في البيئة السريرية لتقديم عبء عمل خضع للتحكم والقياس بينما تتم مراقبة المريض، وعادة ما يكون ذلك باستخدام تخطيط القلب الكهربائي وقراءات ضغط الدم. وهو المنصة المعيارية لاختبار إجهاد القلب بالتمارين الرياضية المُستخدم لاستحثاث واكتشاف علامات نقص تروية عضلة القلب.

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Knowing what an exercise stress test involves helps patients understand how ischemia is unmasked in people who show no symptoms at rest.

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A standardized exercise test performed on a stationary cycle ergometer (or similar device) at progressively increasing workloads to assess cardiovascular function and detect ischemia; Peter Megdal's abnormal result prompted further investigation that revealed coronary artery disease.

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Knowing what triggered a diagnosis helps readers understand which tests can catch hidden heart disease.

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زيادة عدد كريات الدم الحمراء هي زيادة غير طبيعية في عدد كريات الدم الحمراء المتداولة في الدم، مما يؤدي إلى ارتفاع لزوجة الدم (الهيماتوكريت)؛ وهي من الآثار الجانبية المعروفة للعلاج بالتستوستيرون، لأن التستوستيرون يحفز إنتاج كريات الدم الحمراء، وتعد مراقبة الهيماتوكريت (مع حد إكلينيكي يبلغ حوالي 54%) ممارسة معتادة أثناء العلاج.

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Thick blood can strain the cardiovascular system, so this is a key safety parameter doctors track in men on testosterone therapy.

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The Esselstyn program is an extremely low-fat, plant-exclusive dietary protocol developed by cardiologist Caldwell Esselstyn at the Cleveland Clinic, which eliminates all animal products and added oils and has been studied as a means of halting and reversing coronary artery disease. The article's interviewee cites Esselstyn's book as a foundational source in his personal research.

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It is one of the most cited dietary interventions in discussions of heart disease reversal and is directly referenced in the article.

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الأحماض الأمينية الأساسية التسعة - بما في ذلك الليوسين - التي لا يستطيع جسم الإنسان تركيبها بكميات كافية ويجب الحصول عليها من النظام الغذائي؛ إن توفر الأحماض الأمينية الأساسية بشكل كافٍ، لا سيما الليوسين، مطلوب لتنشيط تخليق بروتين العضلات، وتصبح كفايتها أكثر أهمية مع تطور المقاومة البنائية مع تقدم العمر.

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EAA content, not just total grams of protein, determines whether a meal actually triggers muscle maintenance in older adults.

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A naturally occurring estrogen produced by the fetal liver during pregnancy, now under clinical investigation as a menopausal hormone therapy candidate; it is thought to have a more selective tissue profile than conventional estrogens, potentially offering symptom relief with a refined safety profile.

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As a newer treatment option, E4 represents the shift toward more targeted menopause therapies with potentially fewer systemic risks.

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A model proposing that rapid physiological drops or swings in estradiol levels—rather than chronically low absolute levels—are the primary trigger for mood instability, irritability, and anxiety during the menopausal transition.

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This helps explain why some women feel emotionally destabilized even before estrogen reaches its lowest postmenopausal levels.

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الإستروجين هو هرمون، توجد مستوياته بنسبة أعلى بكثير لدى النساء قبل انقطاع الطمث، ويؤثر على الأوعية الدموية، والكوليسترول، والعظام.

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It appears to offer some protection to arteries, which is part of why women tend to develop heart disease about ten years later than men. What happens when estrogen drops at menopause, and whether replacing it helps, is more complicated than it was once made to sound.

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A clinical trial that used serial CCTA to track coronary plaque composition over time in patients receiving icosapent ethyl (a purified omega-3 fatty acid); it demonstrated that the drug produced regression of low-attenuation plaque, establishing CCTA as a tool for monitoring plaque response to therapy.

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It shows that AI-assisted CT imaging can measure whether treatment is actually shrinking the most dangerous type of plaque.

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An approach to clinical decision-making that integrates the best available research evidence with clinical expertise and patient values, rather than relying on tradition or anecdote alone.

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Knowing what 'evidence-based' means helps readers evaluate whether a health intervention has scientific support or is based on personal belief.

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Evinacumab is an injectable antibody that blocks ANGPTL3, used for the most severe inherited cholesterol disorders.

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It works even in patients whose LDL receptors barely function, because it lowers cholesterol by a route that does not depend on them. For children with the homozygous form, that distinction is life-changing.

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إيفولوكوماب هو دواء لخفض الكوليسترول يتم حقنه، ينتمي إلى عائلة مثبطات PCSK9، وعادة ما يُعطى كل أسبوعين إلى أربعة أسابيع.

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It works by protecting the liver's cholesterol-removing receptors, and it can cut LDL and ApoB by half or more even in people already on a statin.

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القدرة على ممارسة الرياضة هي مقياس كمي للجهد البدني الأقصى الذي يمكن للشخص القيام به، وعادة ما يتم تقييمها أثناء اختبار الإجهاد المتدرج كحد أقصى لحمل العمل بالواط، أو الحد الأقصى لاستهلاك الأكسجين (VO2 max)، أو المكافئات الاكتسابية (METs). في المقالة، أشر الانخفاض في القدرة على ممارسة الرياضة بعد أربعة أشهر من تركيب الدعامات إلى أن الإجراء وحده لم يحل المرض الكامن.

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Exercise capacity is both a practical measure of fitness and an independent predictor of cardiovascular prognosis, making changes in it clinically meaningful.

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The oxygen cost of producing a given power output or movement speed; trained cyclists maintain relatively stable exercise economy with age even as their absolute aerobic capacity declines, preserving efficiency.

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It helps explain why older elite athletes can still perform well despite lower VO₂max—they waste less oxygen per watt of power produced.

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A standardized clinical test in which a patient walks or runs on a treadmill at progressively increasing speeds and inclines while heart rate, blood pressure, and ECG are monitored; it can estimate cardiorespiratory fitness and detect myocardial ischemia.

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The 122,000-patient landmark study the article cites used exercise treadmill testing to classify participants into fitness quartiles and link fitness to mortality.

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نقص الحس الألمي الناجم عن التمارين الرياضية هو انخفاض الإدراك بالألم الذي يحدث أثناء وبعد النشاط البدني المكثف، والذي سببه إطلاق المواد الأفيونية الداخلية وغيرها من المواد الكيميائية المثبطة للألم؛ وعند الرياضيين، يمكن لهذا التأثير أن يخفي نقص تروية القلب عن طريق إخماد ألم الصدر الذي لولا ذلك لكان مؤشراً على عدم كفاية تدفق الدم إلى القلب.

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It helps explain why fit people can have serious heart disease without ever feeling the classic warning signs.

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Nausea that occurs during or immediately after vigorous exercise; although often attributed to training intensity or hydration, in the context of coronary artery disease it can be an atypical symptom of myocardial ischemia that athletes frequently dismiss as a normal training response.

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The author's interval-session nausea turned out to be ischemia — highlighting how atypical symptoms in fit people can mask serious cardiac disease.

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Ketone bodies—most commonly β-hydroxybutyrate—consumed directly as drinks or esters rather than produced by the body through carbohydrate restriction; they raise blood ketone levels quickly without requiring dietary change and are used both as research tools and as proposed ergogenic supplements.

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Knowing the difference between diet-induced and supplement-induced ketosis helps readers critically assess performance and health claims made for ketone products.

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Exome sequencing is a genomic technique that reads the protein-coding portions of the genome, allowing researchers to identify rare coding variants—including loss-of-function mutations—that may have large effects on disease risk; it has been used to discover protective variants in genes such as CIDEB and ZNRF3 that would be missed by standard GWAS.

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It uncovers rare but powerful genetic protections against heart disease that population-level studies overlook.

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The expandability hypothesis proposes that individuals differ in the maximum safe lipid-storage capacity of their subcutaneous fat; when that capacity is exceeded, excess lipids spill into ectopic sites — liver, pancreas, skeletal muscle, and heart — causing lipotoxicity and metabolic dysfunction.

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It explains why two people with the same total fat mass can have very different metabolic health outcomes depending on where their bodies store the excess.

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The external elastic membrane is the boundary between an artery's muscular wall and surrounding connective tissue; in intravascular imaging, the area enclosed by the EEM is used to quantify total vessel size including both the open channel and the plaque within the wall.

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Measuring to the EEM rather than just the lumen reveals how much the artery has remodeled outward to accommodate hidden plaque — information a standard angiogram cannot provide.

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زيت الزيتون المعصور على البارد الذي يفي بالمعايير الدولية من حيث انخفاض الحموضة والجودة الحسية؛ وعلى عكس زيت الزيتون المكرر، فإنه يحتفظ بالبوليفينولات الطبيعية والمركبات النشطة بيولوجيًا الثانوية الأخرى التي قد تتمتع بخصائص مضادة للأكسدة ومضادة للالتهابات.

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EVOO is frequently contrasted with seed oils in cardiovascular research, and knowing what distinguishes it from ordinary olive oil helps you evaluate the evidence more accurately.

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المصفوفة خارج الخلية هي السقالة المكونة من الكولاجين والألياف الأخرى التي تربط الأنسجة معًا وتمنح جدار الشريان قوته.

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It is what a fibrous cap is made of. When inflammatory enzymes break it down faster than cells rebuild it, the cap thins and the plaque becomes fragile.

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Extrahepatic synthesis refers to cholesterol production occurring outside the liver—in skeletal muscle, skin, kidney, intestine, and other tissues—which in humans accounts for roughly 90% of total daily cholesterol synthesis.

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This challenges the common assumption that the liver is the body's primary cholesterol factory and clarifies why plasma cholesterol levels reflect transport, not the body's total production.

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Ezetimibe is a pill that blocks your intestines from absorbing cholesterol.

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On its own it lowers cholesterol modestly. Its real value is as a partner drug — added to a statin, it pushes levels lower without increasing the statin dose, and it very rarely causes side effects.

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The Fractional Flow Reserve Versus Angiography for Multivessel Evaluation 2 trial compared FFR-guided PCI against medical therapy alone in stable coronary artery disease, finding that PCI significantly reduced urgent repeat procedures but did not significantly lower mortality or spontaneous heart attack rates at up to 11 years.

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It explains why stents are still widely used—they reliably relieve symptoms and prevent emergency hospital visits, even if they don't extend life.

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Familial defective ApoB-100 is a genetic disorder caused by a mutation in the APOB gene — most commonly the R3500Q (p.Arg3527Gln) variant — that impairs the ability of LDL particles to bind to the LDL receptor, resulting in lifelong elevation of LDL-C and increased atherogenic particle burden.

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It explains why some people have high cholesterol from birth due to a single inherited variant rather than lifestyle, and why that exposure compounds into significant coronary disease over time.

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فرط كوليستيرول الدم العائلي، أو ما يُعرف بـ (FH)، هو حالة وراثية لا يستطيع فيها الكبد التخلص من الكوليسترول من الدم بشكل صحيح. وتكون المستويات مرتفعة للغاية منذ الولادة.

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Roughly one in 250 people has it, and most of them don't know. Because the exposure starts in childhood, heart attacks can happen in a person's thirties or forties. It is one of the strongest arguments for checking cholesterol early rather than waiting for middle age.

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Familial hypobetalipoproteinemia is a genetic condition caused by mutations in the APOB gene that produce truncated, secretion-incompetent proteins, resulting in markedly reduced circulating LDL-C (20–50 mg/dL in heterozygotes, below 10 mg/dL in homozygotes). Affected individuals show substantially lower lifetime ASCVD risk, and homozygotes exhibit minimal plaque on imaging and in autopsy data, r…

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It demonstrates that naturally very low LDL from birth is compatible with normal health and strongly protective against heart disease.

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التاريخ العائلي يعني ما إذا كان أقرباؤك المقربون قد أصيبوا بأمراض القلب، وكم كانت أعمارهم عندما حدث ذلك.

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Early disease in a parent or sibling — before about 55 in men or 65 in women — is a meaningful warning sign. It can reflect shared genes, shared habits, or both, and it should push you toward testing sooner rather than later.

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The Family History Index is the numerical output produced by the Inherited Hazard Coefficient formula; it summarizes the aggregate inherited cardiac signal across a person's family tree in a single score that can be used to guide screening decisions.

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Understanding what the index represents helps users interpret their app result and explain it to a clinician.

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The farnesoid X receptor (FXR) is a nuclear bile acid receptor expressed predominantly in the liver and intestine that, among its many functions, regulates the activity of FMO3 — the hepatic enzyme responsible for converting TMA into TMAO — thereby influencing systemic TMAO levels.

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FXR links bile acid signaling to TMAO metabolism, suggesting that liver health and diet composition together shape cardiovascular risk through this pathway.

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A metabolic pathway in which cells break down fatty acids to generate ATP when preferred fuels like glucose are insufficient; during estrogen deficiency, the brain may shift toward FAO, which has been linked to white matter injury and increased ketone-body burden.

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This alternative fuel-burning mode helps explain why prolonged menopause may affect brain structure and long-term cognitive resilience.

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Fatty liver is fat accumulating inside liver cells, now usually called metabolic dysfunction-associated steatotic liver disease.

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It is extremely common, usually silent, and closely tied to insulin resistance. A fatty liver also produces more ApoB particles, so it raises cardiovascular risk as well as liver risk.

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التخطيط الدهني هو أركر مرحلة مرئية لتصلب الشرايين - وهي لطخة صفراء مسطحة من الخلايا المناعية المليئة بالكوليسترول تحت بطانة الشريان مباشرة.

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They appear in childhood and are present in most teenagers. Not all become plaques, but they are where the process starts, which is why prevention is increasingly discussed as a lifelong matter.

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The Fate of Early Lesions in Children (FELIC) study examined aortic tissue from children aged 1 to 13 who died of non-cardiovascular causes and compared lesion sizes with those seen in fetal specimens, providing indirect evidence that some fetal fatty streaks regress after birth while also showing that children of hypercholesterolemic mothers accumulate lesions faster through childhood.

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It is the key evidence that early arterial damage is not necessarily permanent—but also that maternal cholesterol during pregnancy leaves a lasting biological tendency.

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Dairy products such as yogurt, kefir, and aged cheese in which bacteria or molds have partially broken down lactose and proteins, altering the food's matrix and bioactive compound profile; Astrup's research cited in the article suggests saturated fat from fermented dairy does not carry the same cardiovascular risk as saturated fat from ultra-processed foods.

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Distinguishing fermented from non-fermented dairy refines dietary advice beyond a simple 'avoid saturated fat' message and illustrates the food-matrix principle.

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The process by which the intrauterine environment—particularly maternal nutrition and metabolic state—permanently alters gene expression and metabolic set-points in the developing fetus, with lasting consequences for cardiovascular and metabolic health in later life.

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It means a mother's cholesterol during pregnancy can leave a lasting biological imprint on her child's arteries before birth.

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FFR is a catheter-based measurement of the pressure drop across a coronary artery narrowing during maximal blood flow; a value of 0.80 or below indicates that the blockage is significantly restricting blood flow and is used to decide whether a stent is physiologically justified.

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FAME 2, a key trial in this article, used FFR guidance to select patients for stenting, making it important to understand what FFR measures and why it changes stenting decisions.

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FGF21 is a myokine and metabolic hormone produced by muscle (and liver) during exercise that improves insulin sensitivity and glucose uptake by enhancing insulin signaling in target tissues. The article identifies it as one of the biochemical mediators through which strength training may reduce cardiovascular risk.

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Better glucose handling reduces a key driver of atherosclerosis, linking muscle biology directly to heart protection.

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الألياف هي جزء من الأطعمة النباتية التي لا يستطيع جسمك هضمها. وهي موجودة في الفاصوليا، والشوفان، والخضروات، والفواكه، والحبوب الكاملة.

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Soluble fiber grabs onto bile in your gut and carries it out, which forces your liver to pull cholesterol from your blood to make more. That is a genuine cholesterol-lowering effect from food, not just a general healthy-eating claim.

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Fibrates are pills that lower triglycerides by making the body break down fat-carrying particles more quickly.

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They reliably improve the numbers. Whether they prevent heart attacks is much less clear, and most trials have been disappointing except possibly in people with very high triglycerides and low HDL.

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The physiological process by which the body dissolves blood clots through the enzyme plasmin; Lp(a) impairs this process by competing with plasminogen for fibrin-binding sites, reducing clot clearance and increasing the risk of an occlusive cardiac event.

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Understanding fibrinolysis clarifies the second major way Lp(a) raises heart attack risk, beyond its role in plaque formation.

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A protein that catalyzes the breakdown of fibrin, dissolving blood clots; fibrinolytic activity is distinct from plaque removal, because arterial plaque is embedded in the vessel wall rather than circulating in the bloodstream.

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Knowing the difference between clot dissolution and plaque regression is essential for evaluating any 'artery-clearing' supplement claim.

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The standard unit used to measure the clot-dissolving activity of nattokinase supplements; 2,000 FU per day is the dose found on most commercial bottles and is the dose tested in the NAPS trial.

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Supplement labels express nattokinase potency in FU rather than milligrams, so recognizing this unit is necessary to compare products and study doses.

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A fibroatheroma is an intermediate-to-advanced atherosclerotic lesion defined by the presence of a true necrotic core beneath a fibrous cap; it represents progression beyond the fatty streak and pathologic intimal thickening stages toward the plaque architecture associated with clinical events.

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Recognizing this stage in the lesion progression helps explain how decades of lipid retention and inflammation eventually create the plaques that cause heart attacks.

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Non-contractile fibrous tissue that replaces dead heart muscle after a myocardial infarction; because it lacks the electrical and mechanical properties of normal myocardium, it permanently impairs pumping function in the affected region.

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Myocardial fibrotic scarring illustrates why even optimal secondary prevention cannot fully restore heart function after a heart attack, anchoring the article's discussion of biological inertia.

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الغطاء الليفي هو طبقة صلبة من الأنسجة تغطي اللويحة، تفصل لبها الدهني عن مجرى الدم.

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Think of it as a lid. A thick lid holds. A thin one can tear, and when it does, a clot forms on the spot and a heart attack follows. Much of what cholesterol medicine does is make that lid thicker.

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Fibrous cap thickness is the measured depth of the protective fibrous layer that separates a plaque's lipid core from the flowing blood; a thin fibrous cap is a hallmark of a vulnerable plaque at high risk of rupturing and triggering a heart attack.

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Cap thickness tells you not just how much plaque is present but how dangerous it is — a thin cap over a large lipid pool is the anatomy of a heart attack waiting to happen.

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The Fick principle states that maximal oxygen consumption equals cardiac output multiplied by the arteriovenous oxygen content difference; it provides the mathematical framework for separating how much of an athlete's aerobic decline is due to a weakening heart pump versus reduced oxygen extraction by the muscles.

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Understanding this equation shows why both heart-pump capacity and muscle oxygen use must be maintained to preserve endurance performance with age.

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An elite professional cyclist who holds the UCI Hour Record for able-bodied men, representing the gold-standard benchmark against which amateur and para-athlete hour record performances are contextualised.

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Comparing elite and masters or para performances illustrates the wide spectrum of cardiovascular and aerobic capacity in competitive cycling.

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A side-branch artery that arises from the Left Anterior Descending (LAD) coronary artery and supplies blood to a portion of the left ventricular wall; in the Megdal study, the origin of the first diagonal branch showed the most dramatic regression—from severe stenosis (60–75%) in 2014 to a fully patent state in 2018.

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This vessel is the single most striking example of reversal in the study, illustrating how complete healing of a dangerous blockage is possible.

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A biological family member who shares approximately 50 percent of an individual's genetic material, specifically parents, siblings, and children; cardiac events in first-degree relatives carry substantially more inherited risk signal than events in more distant relatives.

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Whether the affected family member is a parent or sibling versus a grandparent or cousin changes how strongly that history should influence your own cardiac risk assessment.

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توسع الأوعية المتوسط بالتدفق هو قياس بالموجات فوق الصوتية غير جراحي لمدى اتساع الشريان الناقل — وعادة ما يكون الشريان عضدي — استجابة لزيادة تدفق الدم، مما يكون بمثابة مؤشر لإشارات أكسيد النيتريك البطاني ووظيفة بطانة الأوعية الدموية.

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It is one of the key measures used in vascular intervention studies to assess whether diet or drugs improve the health of the artery's inner lining.

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FMO3 is a liver enzyme that converts the gut-derived gas TMA into TMAO; its activity is suppressed by insulin in healthy individuals but rises substantially when hepatic insulin resistance is present. The article frames FMO3 as a metabolic hub linking gut microbiome activity, liver function, and circulating TMAO levels.

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FMO3 activity explains why people with metabolic disease have higher TMAO even without eating more red meat.

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الخلية الرغوية هي خلية مناعية ابتلت كمية كبيرة من الكوليسترول المحاصر لدرجة أنها تتورم وتظهر بمظهر رغوي تحت المجهر.

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These cells came to help, then got stuck and died where they sat. Piles of dead foam cells form the greasy center of a plaque. They are the reason plaque is as much an immune problem as a fat problem.

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تشير مصفوفة الغذاء إلى البنية الفيزيائية والكيميائية للغذاء الكامل - جدران الخلايا، الألياف، شبكات البروتين - التي تحيط بمغذياته وتتفاعل معها؛ فالدهون المستهلكة ضمن مصفوفة غذائية سليمة، مثل اللوز الكامل مقارنة بزيت اللوز، تُمتص بشكل أبطأ وأقل اكتمالاً مقارنة بالدهون نفسها في شكلها المستخلص والمُصَفَّى.

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It explains why eating nuts and avocados may have different metabolic effects than drizzling the equivalent amount of oil, and is central to the article's recommendation to get more fat from whole foods.

تعريف

A founder population is a group descended from a small number of common ancestors, resulting in reduced genetic diversity and an elevated frequency of certain rare variants; in cardiovascular genetics, founder populations such as specific Icelandic or Finnish cohorts have been used to discover cardioprotective variants that are too rare to detect efficiently in heterogeneous global samples.

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Studying isolated communities with shared ancestry can reveal rare genetic protections against heart disease far more efficiently than studying the general population.

تعريف

A founder variant is a gene mutation that originated in a single ancestor and has reached an unusually high frequency in a genetically isolated population — such as the APOB R3500Q variant in the Old Order Amish — making that community a natural study group for understanding the long-term effects of the mutation.

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Founder populations allow scientists to study the effect of a single genetic change across many individuals who share similar lifestyles, providing clearer evidence about lifelong cholesterol exposure and heart disease.

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اختبرت دراسة فورييه (FOURIER) إيفولوكوماب، وهو مثبط لـ PCSK9، في المرضى الذين يعانون مسبقاً من أمراض قلبية وعائية وكانوا يتناولون الستاتين.

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It drove LDL down to around 30 mg/dL and still reduced events, with no sign of a floor below which lowering stopped helping. It largely settled the question of whether very low LDL is safe.

تعريف

تقييم تجربة FOURIER مثبط PCSK9 إيفولوكوماب المضاف إلى علاج الستاتين وأثبت أن خفض الجسيمات المحتوية على ApoB بشكل عدواني قلل من الأحداث القلبية الوعائية؛ كما أظهر التحليل أن المرضى الذين حققوا مستوى منخفض جداً من LDL-C لكنهم احتفظوا بمستوى مرتفع من hs-CRP ما زالوا يواجهون خطراً متبقياً مرتفعاً، مما يدعم نموذج المخاطر المزدوجة لتكون العصيدة.

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FOURIER showed that even ultra-low cholesterol does not fully protect you if inflammation remains high—both targets matter.

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The open-label extension of the FOURIER trial, which tracked patients treated with evolocumab for seven or more years and found sustained cognitive stability even among those maintaining LDL-C below 20 mg/dL.

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Long-term extension data are critical for ruling out slow-developing harms that a shorter trial might miss.

تعريف

يقيس الاحتياطي الاحتشادي الجزئي هبوط الضغط عبر التضيق لمعرفة ما إذا كان يحد بالفعل من تدفق الدم.

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Eyeballing an angiogram is unreliable. A lesion that looks tight may pass plenty of blood, and stenting one that does not need it provides no benefit. This test decides which narrowings are worth treating.

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The Framingham Heart Study began in 1948 in one Massachusetts town and has now followed three generations of families.

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It gave us the phrase "risk factor" and identified cholesterol, blood pressure, and smoking as the drivers of heart disease. Nearly every risk calculator descends from it.

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The Framingham Offspring Cohort is the second-generation study of the Framingham Heart Study, enrolling the adult children of the original participants; it has provided longitudinal data linking decades of hyperlipidemia exposure in young adulthood to later coronary heart disease risk, independent of lipid levels at midlife.

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Its multi-decade follow-up makes it one of the few datasets capable of testing whether early exposure leaves a lasting cardiovascular imprint.

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The Framingham Risk Score is a specific ten-year heart-attack-risk calculator built from the Framingham Heart Study's decades of data — the original tool that turned "risk factors" into a number.

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It's still widely cited, but it and its successors were built on older, less diverse populations, so they consistently underestimate risk in groups they weren't trained on — including highly fit masters athletes with real plaque burden.

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The Frank-Starling mechanism is the heart's intrinsic ability to increase the force of contraction when more blood fills the ventricle during diastole; master athletes exploit this by developing larger, more compliant ventricles that can pump greater stroke volumes even as maximum heart rate falls.

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It explains how well-trained older athletes partially compensate for a lower maximum heart rate by squeezing more blood out with each beat.

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Free fatty acids are fat molecules travelling loose in the blood after being released from fat stores.

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Visceral fat dumps them straight into the vein feeding the liver. The liver responds by making more triglycerides and more ApoB particles — the mechanical link between belly fat and a bad lipid panel.

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فرضية الهرمون الحر هي المبدأ القائل بأن الجزء غير المرتبط بالبروتين فقط من الهرمون هو القادر على عبور أغشية الخلايا وممارسة التأثيرات البيولوجية، مما يجعل الجزء الحر ( والمرتبط بشكل فضفاض بالألبيومين) هو المقياس ذو الصلة الفسيولوجية بدلاً من التركيز الإجمالي المتداول في الدم.

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This concept underlies why doctors are increasingly urged to measure bioavailable rather than total testosterone.

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التستوستيرون الحر هو الجزء الصغير (حوالي 1–4% من الإجمالي) الذي يدور في الدم دون ارتباط بأي بروتين، ويمكنه الانتشار مباشرة عبر أغشية الخلايا لتنشيط مستقبلات الأندروجين داخل الخلايا.

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It is the most immediately active form of testosterone and a key component of bioavailable testosterone measurement.

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The Future Revascularization Evaluation in Patients with Diabetes Mellitus trial randomized 1,900 diabetic patients with multivessel coronary artery disease to PCI or CABG, finding that bypass surgery significantly reduced death and heart attack rates compared with stenting over up to 13 years.

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It is the key evidence base for recommending bypass surgery over stenting in patients who have both diabetes and multiple blocked arteries.

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The French Paradox is the observation that France had relatively low coronary heart disease mortality in the 1980s and 1990s despite high saturated fat consumption; analyses have attributed this apparent paradox to a time-lag in France's adoption of high-fat diets compared with other Western nations, systematic under-certification of CHD deaths by French physicians, and the cumulative nature of a…

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The French Paradox has long been used to question the diet-heart link, so understanding why it is a statistical artifact rather than a genuine exception is important for evaluating nutrition claims.

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A widely used mathematical formula that estimates LDL cholesterol from total cholesterol, HDL cholesterol, and triglycerides rather than measuring it directly; it becomes unreliable when triglycerides are elevated or blood is drawn in a non-fasting state, which is one reason ApoB measurement is considered more accurate in certain patients.

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Understanding this limitation explains why a 'normal' LDL-C result can still miss meaningful cardiovascular risk.

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The effective gravitational load experienced by a rider when centripetal acceleration through a steeply banked curve adds to normal body weight; on a 40-degree banked track the combined force can approach twice the rider's resting body weight, increasing cardiovascular and musculoskeletal demand.

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Elevated mechanical load during exercise directly increases cardiac workload and oxygen demand.

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Gastrointestinal hemorrhage is bleeding within the digestive tract, most commonly in the stomach or upper intestine; it is the most frequent serious bleeding complication of long-term aspirin use and often tips the benefit–risk balance against aspirin in primary prevention.

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It is the main measurable harm seen in large primary-prevention aspirin trials, directly competing with the cardiovascular events the drug is meant to prevent.

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A multiprotein complex that acts as a positive regulator of mTORC1 by transmitting leucine availability signals from Sestrin2 to the Rag GTPases, which then recruit mTORC1 to the lysosomal surface for activation.

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GATOR2 is part of the precise molecular machinery that translates the leucine content of a meal into a muscle-building signal, relevant to understanding why protein quality matters in aging.

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تشير تأثير جرعة الجينات إلى الاحتمالية المضاعفة لحمل متغير قلبي ممرض عندما يعاني كلا الوالدين من حوادث قلبية مبكرة؛ حيث إن وجود والدين مصابين من الدرجة الأولى يضاعف تقريباً إشارة الخطر الموروث مقارنة بوجود والد واحد مصاب، مما يرفع احتمال وجود طفرة موروثة مسببة للمرض بشكل كبير.

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It explains why the app treats two-parent cardiac histories as categorically more alarming than single-parent histories.

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A gene variant is a small difference in your DNA compared with most other people.

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Some variants raise cholesterol, some lower it, and some barely matter. Studying people who were born with naturally low cholesterol has been one of the most powerful ways to prove that lowering it actually prevents heart attacks.

تعريف

علم الوراثة هو دراسة ما ترثه من والديك.

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Your genes strongly influence your cholesterol, blood pressure, and how early plaque starts forming. What they do not do is seal your fate. Genes set your starting point and how fast the meter runs; what you do about it still changes the outcome.

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A genome-wide association study (GWAS) scans hundreds of thousands to millions of genetic variants across the entire human genome to identify positions statistically associated with a trait or disease; in cardiovascular research, GWAS has identified common variants near genes such as HMGCR and NPC1L1 that implicate therapeutic targets even when each variant's individual effect is small.

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GWAS is how researchers discovered most of the genetic links between specific proteins and heart disease risk.

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Gestational diabetes is high blood sugar that appears during pregnancy and usually resolves after delivery.

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Resolving is not the end of it. It signals a metabolism that struggles under load, and it strongly predicts later type 2 diabetes and cardiovascular disease.

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Ghrelin is a hormone produced primarily in the stomach that stimulates appetite and promotes fat storage; sleep deprivation raises ghrelin levels while lowering leptin, creating a hormonal environment that increases caloric intake and encourages fat accumulation in visceral depots.

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Understanding ghrelin's role explains the biological mechanism linking poor sleep to weight gain and belly fat.

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أضافت دراسة GLAGOV مثبطاً لـ PCSK9 إلى العلاج بالستاتين وقاست اللويحة التاجية باستخدام الموجات فوق الصوتية داخل الأوعية قبل وبعد ذلك.

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Plaque shrank, and it shrank even in patients whose starting LDL was already considered good. It is a key piece of evidence that lower is better for reversing disease, not just slowing it.

تعريف

The Glagov effect (compensatory or outward remodeling) is the tendency of an artery to expand its outer diameter as plaque accumulates within the wall, preserving the inner lumen size and blood flow until plaque burden becomes very large; this means significant atherosclerosis can be present without causing measurable narrowing on a standard angiogram.

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The article uses this phenomenon to explain why trained athletes may feel perfectly well and still set personal records despite harboring substantial hidden coronary plaque.

تعريف

The Glagov phenomenon (also called compensatory or outward remodeling) is the tendency of an arterial wall to expand outward as atherosclerotic plaque accumulates, thereby preserving the inner lumen diameter until plaque burden becomes very large. Because lumen size stays normal during this compensatory phase, standard stress tests and angiograms can appear normal even in the presence of substant…

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This explains how a person can feel completely well and pass a stress test while carrying significant hidden arterial disease.

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Glomerular filtration is the process by which the kidney's glomeruli — tiny capillary networks — filter waste products and small molecules, including TMAO, from the bloodstream into the urine; adequate glomerular filtration clears fish-derived TMAO within roughly 24 hours, whereas chronic kidney disease reduces this clearance and allows TMAO to accumulate.

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This explains why people with kidney disease are especially vulnerable to TMAO-related cardiovascular and renal harm.

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GLP-1 receptor agonists are injectable medicines — semaglutide and tirzepatide are the best known — that copy a gut hormone controlling appetite and blood sugar.

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They cause substantial weight loss, but the interesting finding is that they reduce heart attacks and strokes faster than the weight comes off. That suggests they are doing something to blood vessels directly, not just shrinking waistlines.

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Glucocorticoid receptor resistance is a state in which cells become less responsive to cortisol's signalling, so the body's ability to regulate inflammation and other stress responses is impaired even when cortisol levels appear normal. The article lists it as one of the HPA dysregulation patterns associated with adverse cardiovascular phenotypes.

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It explains why measuring cortisol in the blood can miss important stress-related biology — the problem may be in how cells respond, not just how much hormone is circulating.

تعريف

الجلوكوز هو السكر الذي يحمله دمك لتغذية خلاياك.

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Your body keeps it in a tight range using insulin. When that system starts failing, glucose creeps up — and the damage to blood vessels begins well before the number is high enough to be called diabetes.

تعريف

A carbohydrate chain or sugar molecule attached to proteins or lipids on cell surfaces; Neu5Gc is incorporated into human cell-surface glycans after red meat consumption, where it is recognized by the immune system as foreign.

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Glycans are the structural context in which Neu5Gc is displayed on cells, making this term essential to understanding how the immune reaction is triggered.

تعريف

السيطرة على سكر الدم هي مدى انتظام الحفاظ على نسبة السكر في الدم ضمن النطاق الصحي بمرور الوقت.

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Good control clearly protects the small vessels of the eyes, kidneys, and nerves. Its effect on heart attacks is weaker, which is why cholesterol and blood pressure still need treating in their own right.

تعريف

مقياس يجمع بين جودة وكمية الكربوهيدرات في الوجبة من خلال ضرب مؤشر نسبة السكر في الدم للطعام في كمية الكربوهيدرات التي يحتوي عليها؛ إن تقييد الكربوهيدرات يخفض الحمل الجلايسيمي ويمكن أن يقلل من ارتفاع سكر الدم بعد الوجبة.

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The article cites reduced glycemic load as one mechanism by which low-carb diets improve short-term glucose control in type 2 diabetes.

تعريف

الغليكوكالكس هو طبقة رقيقة غنية بالسكر على السطح الداخلي للأوعية الدموية، وهي نوع من الطبقات الهلامية بين الدم والخلايا.

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It acts as a first barrier and helps the vessel sense blood flow. Damage to it — from high blood sugar, inflammation, or turbulent flow — is one of the earliest events in vascular disease.

تعريف

Glycoconjugates are molecules—typically proteins (glycoproteins) or lipids (glycolipids)—to which sugar chains are covalently attached; sialic acids, including Neu5Gc from dietary red meat, are added to glycoconjugates in the Golgi apparatus and then displayed on cell surfaces.

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The incorporation of foreign Neu5Gc into human glycoconjugates is the key step that transforms a dietary sugar into a target for immune attack on artery walls.

تعريف

الglycosaminoglycans هي سلاسل سكرية طويلة ومحشوة بشحنات سالبة، وتُعد مكونات رئيسية للمصفوفة خارج الخلية الشريانية والأنسجة الضامة للّويحات؛ وفي لويحات قردة المكاك ذات الأسنان الكلابية، تُعتبر مكونات هيكلية بارزة تستمر في التواجد بعد تراجع المكونات الغنية بالدهون.

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They are part of the fibrous scaffold that remains after treatment, explaining why plaques become denser and more stable rather than disappearing entirely.

تعريف

The glymphatic system is a perivascular waste-clearance network in the brain that uses cerebrospinal fluid flowing along blood vessel walls to flush out metabolic byproducts, including amyloid-beta and tau, primarily during sleep.

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Arterial stiffness disrupts the pulse-driven flow that powers this system, offering a direct mechanism by which vascular disease could cause amyloid buildup in the brain.

تعريف

إن نظام GRADE (تقييم وتطوير وتصنيف توصيات التوجيه السريري) هو إطار عمل واسع الانتشار لتقييم درجة اليقين في الأدلة الكامنة وراء أي نتيجة سريرية، حيث يتم تصنيفها إلى عالية، أو متوسطة، أو منخفضة، أو منخفضة جداً، بناءً على عوامل مثل تصميم الدراسة، وخطر التحيز، الاتساق، والمباشرة، ودقة النتائج.

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Knowing how GRADE works helps readers understand why two studies showing the 'same' result can still carry very different levels of confidence.

تعريف

The gut microbiome is the enormous community of bacteria living in your intestines. There are trillions of them, and they are not passive passengers.

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They break down parts of your food into new compounds that enter your bloodstream. That means what you eat can affect your heart indirectly, through what your bacteria make out of it.

تعريف

نسبة الخطر تقارن مدى سرعة حدوث الأحداث في مجموعتين. تعني النسبة البالغة 0.75 أن الأحداث حدثت بثلاثة أرباع المعدل في المجموعة المعالجة.

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It is a relative measure, so it says nothing about how common the event was to begin with. A hazard ratio of 0.5 sounds dramatic whether the risk fell from 40 percent to 20 or from 0.4 percent to 0.2.

تعريف

Human chorionic gonadotropin is a hormone that mimics luteinizing hormone (LH), stimulating testicular Leydig cells to produce testosterone; in men on testosterone replacement therapy it is used to preserve intratesticular testosterone production and maintain spermatogenesis, which exogenous testosterone alone suppresses.

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Men concerned about fertility or testicular atrophy during testosterone therapy need to understand the role hCG plays.

تعريف

HDL, or high-density lipoprotein, is the particle often called "good cholesterol." It picks up cholesterol from tissues and carries it back to the liver.

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The nickname has aged badly. People with naturally high HDL are healthier, but drugs that raise HDL have repeatedly failed to prevent heart attacks. High HDL seems to be a sign of good health rather than a cause of it.

تعريف

A functional measure of HDL's ability to accept cholesterol from cholesterol-laden macrophages in arterial walls and transport it to the liver for removal; emerging evidence suggests CEC predicts cardiovascular risk more accurately than the simple blood concentration of HDL cholesterol.

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A high HDL number on a standard test does not guarantee protection — what the HDL actually does matters more.

تعريف

Healthspan is the portion of a person's life spent in good health, free from serious disease, disability, or significant functional decline, as distinguished from total lifespan, which counts all years alive regardless of health status.

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Focusing on healthspan rather than lifespan alone shifts the goal from simply living longer to living better for longer.

تعريف

A composite research endpoint used in long-term cohort studies—such as the Nurses' Health Study—defined as surviving to older age free from major chronic diseases (including cardiovascular disease), significant cognitive decline, and functional impairment; the 2024 Nurses' Health Study analysis found higher midlife plant-protein intake to be a significant predictor of this outcome.

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Using 'healthy aging' as an endpoint captures cardiovascular benefit more completely than disease incidence alone, making it a stronger measure of dietary impact.

تعريف

ظاهرة مربكة تميل فيها أفواج المشربين باعتدال إلى التمتع بوضع اجتماعي واقتصادي أرفع، وأنظمة غذائية أفضل، وأسلوب حياة أكثر نشاطاً، مما يجعل الكحول يبدو وقائياً بينما قد يكون مجرد علامة على سلوكيات أخرى تعزز الصحة.

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It is one of the main reasons observational studies on alcohol and heart health can be misleading.

تعريف

The difference between a person's biological heart age—estimated from electrocardiographic, vascular, or risk-factor models—and their chronological age; a positive gap indicates that the heart is functionally older than the calendar age and predicts higher cardiovascular risk and worse survival.

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Seeing a concrete gap in 'years' is shown to motivate behavior change more effectively than abstract risk percentages.

تعريف

تحدث النوبة القلبية عندما ينقطع تدفق الدم عن جزء من عضلة القلب وتبدأ تلك العضلة في الموت.

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The usual trigger is not a slow closing of the artery. It is a plaque cracking open, with a clot forming on top in minutes. That is why heart attacks so often strike people who felt fine the day before, and why plaques too small to cause symptoms can still kill.

تعريف

A person who has been diagnosed with significant cardiac disease—such as severe atherosclerotic heart disease—and has not died from it, often implying they have managed or reversed their condition through medical treatment, lifestyle change, or both.

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Understanding this term helps readers recognize that cardiac diagnoses are not always fatal or permanently disabling, and that meaningful recovery is possible.

تعريف

Heart failure means the heart cannot pump well enough to meet the body's needs. The name is misleading — it does not mean the heart has stopped.

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It causes breathlessness, swollen legs, and fatigue. Common causes include past heart attacks, long-standing high blood pressure, and valve problems.

تعريف

معدل ضربات القلب هو عدد مرات نبض القلب في الدقيقة.

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A lower resting rate usually reflects better fitness — trained endurance athletes often sit in the 40s. On its own, though, resting heart rate says very little about whether you have plaque.

تعريف

معدل تقلب نبضات القلب هو التباين الطبيعي نبضة بنبضة في الوقت بين نبضات القلب، ويُستخدم مقياساً غير جراحي لتوازن الجهاز العصبي الذاتي؛ حيث يُظهر التقلب الأعلى عموماً نشاطاً أكبر للجهاز العصبي اللاودّي (الراحة والهضم). وهو مذكور في المقال ك1 النتائج التي قيست في تجارب التأمل.

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HRV is frequently cited as a marker of stress resilience and cardiovascular health, so knowing what it actually measures helps you evaluate wearable-device claims.

تعريف

The physiological adaptation to exercising in warm environments, including increased plasma volume, earlier onset of sweating, and reduced cardiovascular strain at a given temperature; athletes who train in cool climates lack this adaptation and experience greater heart-rate elevation and performance decline when competing in heat.

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Poor heat tolerance raises cardiovascular stress during exertion, which is a meaningful risk factor for older athletes and heart patients exercising in warm conditions.