Pathophysiological Progression and Systemic Functional Impact of Subclinical Atherosclerosis
A Life-Course Analysis from Youth to Mid-Life
सारांश
एथेरोस्क्लेरोटिक हृदय रोगहृदय वाहिनी रोग हृदय और रक्त वाहिकाओं से जुड़ी समस्याओं के लिए एक व्यापक शब्द है, जिसमें दिल का दौरा, स्ट्रोक और पैर की धमनियों का अवरुद्ध होना शामिल है।. (ASCVD) remains the leading cause of mortality worldwide, and its clinical manifestations represent the late-stage culmination of a biological trajectory that begins decades earlier — often in fetal life and certainly by the second decade. This review integrates structural vascular biology, hemodynamics, lipid causality, सूजनसूजन, चोट या किसी ऐसी चीज़ के प्रति आपकी प्रतिरक्षा प्रणाली (इम्यून सिस्टम) की प्रतिक्रिया है जिसे वह बाहरी आक्रमणकारी मानती है। यह अपने साथ सूजन, गर्मी और सफाई करने वाली कोशिकाओं को लाती है।., sex-specific phenotypes, neurodegeneration, and lifestyle reversibility into a unified framework for understanding सबक्लिनिकल एथरोस्क्लेरोसिसSubclinical atherosclerosis means plaque is present but has not yet caused any symptoms or events. as an active, progressive, and modifiable disease. We examine regional heterogeneity in arterial wall architecture and the role of वासा वासोरोमवासा वासोरोम (vasa vasorum) छोटे रक्त वाहिकाएं होती हैं जो बड़ी धमनी की दीवार को रक्त की आपूर्ति करती हैं। इस नाम का अर्थ है "वाहिकाओं की वाहिकाएं।", the divergence of large-artery धमनी काठिन्यएथेरोस्क्लेरोसिस वह बीमारी है जो अधिकांश दिल के दौरों और कई स्ट्रोक के पीछे होती है। कोलेस्ट्रॉल के कण धमनी की दीवार में फंस जाते हैं, शरीर उन्हें साफ करने के लिए प्रतिरक्षा कोशिकाओं को भेजता है, और वर्षों में वह मलबा पट्टिका (प्लाक) के रूप में सख्त हो जाता है।. from cerebral small vessel disease, the hemodynamic determinants of पट्टिकाप्लाक धमनी की दीवार के अंदर कोलेस्ट्रॉल, प्रतिरक्षा कोशिकाओं, निशान ऊतक और कैल्शियम का निर्माण है।. localization, and the longitudinal evidence from पीडीएवाईPDAY, short for Pathobiological Determinants of Atherosclerosis in Youth, examined the arteries of young people aged 15 to 34 who died of other causes., Bogalusa, कार्डियाCARDIA has followed young adults from their twenties into later life, tracking fitness, cholesterol, blood pressure, and what eventually happened to them., MESAमेसा (MESA), यानी मल्टी-एथनिक स्टडी ऑफ़ एथेरोस्क्लरोसिस, ने दिल की किसी भी ज्ञात बीमारी से रहित हज़ारों वयस्कों का अनुसरण किया, उनकी धमनियों की स्कैनिंग की और परिणामों पर नज़र रखी।., and the FELIC fetal series that anchor disease initiation in early life. We synthesize Mendelian-randomization, population-genetic, and intervention-trial evidence establishing एपोलिपोप्राटीनएपolipoprotein रक्त में वसा ले जाने वाले कण से जुड़ी एक प्रोटीन है। वसा और पानी आपस में मिलते नहीं हैं, इसलिए ये प्रोटीन एक आवरण की तरह काम करते हैं जो वसा को रक्तप्रवाह में सुरक्षित रूप से यात्रा करने की अनुमति देता है।. बी-युक्त लाइपोप्रोटीनलाइपोप्रोटीन एक छोटा पैकेट है जो आपके रक्तप्रवाह के माध्यम से वसा और कोलेस्ट्रॉल ले जाता है। चूंकि वसा पानी में नहीं घुलती है, इसलिए इसे यात्रा करने के लिए एक प्रोटीन आवरण की आवश्यकता होती है।. as the necessary causal driver of एथरोएजेनेसिसएथेरोलोजेनेसिस प्लाक के बनने की चरण-दर-चरण प्रक्रिया है।., and we situate Lp(a), inflammation, clonal hematopoiesis, एन्डोथेलियल डिसफंक्शनएंडोटेलियल डिसफंक्शन तब होता है जब वह पतली परत अपना काम ठीक से करना बंद कर देती है। वाहिकाएँ ठीक से चौड़ी नहीं होती हैं, और बैरियर अधिक लीक होने लगता है।., microvascular rarefaction, and arterial stiffening within this framework. We close with the imaging and बायोमार्कर्सबायोमार्कर शरीर में मापने योग्य कुछ ऐसा है जो आपको स्वास्थ्य या बीमारी के बारे में बताता है — एक लैब वैल्यू, एक स्कैन परिणाम, एक ब्लड प्रेशर रीडिंग।. tools that allow detection during the long pre-clinical window, the sex-specific phenotypes that have historically been under-recognized, and the trial evidence — most prominently the लाइफ़स्टाइल हार्ट ट्रायलडीन ओर्निच द्वारा नेतृत्व किया गया लाइफस्टाइल हार्ट ट्रायल एक छोटा यादृच्छिक अध्ययन था जिसमें एक गहन जीवनशैली हस्तक्षेप - बहुत कम वसा वाला पौधे-आधारित आहार, व्यायाम, तनाव प्रबंधन और समूह सहायता - का परीक्षण किया गया था, जिसमें सीरियल कोरोनरी एंजियोएग्राफी का उपयोग किया गया था; हस्तक्षेप समूह की मापी गई धमनी संकीर्णता में थोड़ा सुधार हुआ जबकि नियंत्रण समूह की स्थिति बदतर हो गई, लेकिन एंजियोएग्राफी की तकनीकी सीमाओं, संदर्भ-खंड संकीर्णता…, the Esselstyn case series, STARS, and the IVUS-documented स्टैटिनएक स्टैटिन उस एंजाइम को धीमा कर देता है जिसका उपयोग आपका यकृत (लिवर) कोलेस्ट्रॉल बनाने के लिए करता है। आपका यकृत आपके रक्त से अधिक कोलेस्ट्रॉल खींचकर प्रतिक्रिया करता है, और यहीं से वास्तविक लाभ मिलता है।. and PCSK9-inhibitor regression trials (REVERSALREVERSAL अध्ययन ने कोरोनरी प्लाक (धमनियों में वसा का जमाव) पर क्या प्रभाव पड़ा, यह मापने के लिए इंट्रावास्कुलर अल्ट्रासाउंड का उपयोग करके मध्यम और गहन स्टेटिन थेरेपी की तुलना की।., क्षुद्रग्रहएस्ट्रोइड एक ऐसा परीक्षण था जिसमें रोगियों को रोसुवास्टैटिन की उच्चतम खुराक दी गई और इंट्रावास्कुलर अल्ट्रासाउंड के साथ पहले और बाद में उनके कोरोनरी प्लाक की तस्वीरें ली गईं।., शनिSATURN ने अधिकतम खुराक पर सबसे मजबूत स्टैटिन की आमने-सामने तुलना की, और इंट्रावास्कुलर अल्ट्रासाउंड से कोरोनरी प्लाक को मापा।., GLAGOVGLAGOV ने स्टैटिन थेरेपी में एक PCSK9 अवरोधक (इहिबिटर) को जोड़ा और इंट्रावास्कुलर अल्ट्रासाउंड के साथ पहले और बाद में कोरोनरी प्लेक को मापा।., पैकमान-एमीPACMAN-AMI ने दिल के दौरे के तुरंत बाद रोगियों को PCSK9 अवरोधक दिया और तीन अलग-अलग कैथेटर तकनीकों से उनकी गैर-दोषी धमनियों की इमेजिंग की।., हाइगेंसह्यूजेन्स (HUYGENS) ने ऑप्टिकल कोहेरेंस टोमोग्राफी — एक बहुत ही उच्च-रिज़ॉल्यूशन वाली इमेजिंग कैथेटर — का उपयोग यह देखने के लिए किया कि क्या एक PCSK9 अवरोधक ने दिल के दौरे के बाद पट्टिका की संरचना को बदल दिया।.) — supporting the conclusion that subclinical atherosclerosis is, when addressed early and aggressively, a reversible disease.
Keywords
Subclinical atherosclerosis; apolipoprotein B; लाइपोप्रोटीन (ए)लाइपोप्रोटीन (a), जिसे Lp(a) लिखा जाता है और "एल-पी-लिटिल-ए" कहा जाता है, एक एलडीएल जैसी कणिका है जिसके साथ एक अतिरिक्त चिपचिपा प्रोटीन जुड़ा होता है।.; endothelial dysfunction; vasa vasorum; cerebral small vessel disease; coronary धमनीधमनी एक ऐसी रक्त वाहिका है जो हृदय से शरीर के बाकी हिस्सों तक रक्त ले जाती है।. calcium; pulse wave velocityPulse wave velocity measures how fast the pressure wave from each heartbeat travels along your arteries. Stiffer arteries carry it faster.; पट्टिका प्रतिगमनपट्टिका प्रतिगमन का मतलब है कि मौजूदा पट्टिका वास्तव में केवल धीरे-धीरे बढ़ने के बजाय छोटी हो जाती है।.; whole-food पौधारोपण-आधारित आहारएक पौधे-आधारित, या पौधे-प्रधान आहार, मुख्य रूप से सब्जियों, फलों, बीन्स, साबुत अनाज, नट्स और बीजों के आस-पास बनता है, जिसमें पशु से मिलने वाले खाद्य पदार्थ सीमित होते हैं या बिल्कुल नहीं होते हैं।..

1. परिचय
The emergence of clinical ASCVD is the culmination of a silent, multi-decadal biological trajectory that often begins in the second decade of life — and in the case of fetuses exposed to maternal हाइपरकोलेस्ट्रॉलएमीयाहाइपरकोलेस्ट्रॉलएमिया रक्त में कोलेस्ट्रॉल ले जाने वाले कणों का एक असामान्य रूप से बढ़ा हुआ स्तर है, जो आमतौर पर प्राइमेट प्रयोगों में आहारीय कोलेस्ट्रॉल और संतृप्त वसा से भरपूर आहार खिलाने के कारण होता है, और धमनियों की दीवारों में तेजी से पट्टिका (प्लाक) बनने से जुड़ा हुआ है।., even before birth. Subclinical atherosclerosis refers to the presence of structural arterial wall alterations — including इंटीमल थिकनिंगइंटिमल थिकनिंग धमनियों की सबसे अंदर की परत (इंटिमा) की मोटाई में होने वाली एक प्रारंभिक अनुकूली या पैथोलॉजिकल वृद्धि है, जो या तो सामान्य विकासात्मक परिवर्तनों को दर्शा सकती है या चिकनी मांसपेशियों की कोशिकाओं, लिपिड और इंफ्लेमेटरी कोशिकाओं के संचय को जो स्पष्ट प्लाक निर्माण से पहले होते हैं। इसे कैरोटिड इंटिमा-मीडिया थिकनेस अल्ट्रासाउंड द्वारा गैर-आक्रामक तरीके से मापा जा सकता है।., lipoprotein retention, foam-cell accumulation, and early plaque formation — that precede overt symptomatic manifestations such as एनजाइनाएंजाइना सीने की वह बेचैनी है जो तब होती है जब हृदय की मांसपेशियों को पर्याप्त ऑक्सीजन नहीं मिल रही होती है। लोग इसे दबाव, जकड़न, कसाव या जलन के रूप में वर्णित करते हैं, और यह हाथ, गर्दन या जबड़े तक फैल सकता है।., मायोकार्डियल इंफार्क्शनपूर्ण प्रविष्टि के लिए हार्ट अटैक देखें।., इस्केमिक स्ट्रोकइस्कीमिक स्ट्रोक तब होता है जब मस्तिष्क के एक हिस्से में रक्त का प्रवाह अवरुद्ध हो जाता है और मस्तिष्क के ऊतक मरने लगते हैं।., peripheral claudication, or vascular dementia. This silent progression is governed by a tightly coupled interplay between hemodynamic forces, structural variations in the arterial wall, lipoprotein flux, immune activation, and metabolic stress.
Although traditionally framed as a disease of senescence, longitudinal cohort studies and autopsy data have fundamentally shifted the focus toward young adults and adolescents, revealing that subtle everyday functional deficits — ranging from diminished cognitive processing speed to impaired renal and erectile reserve — emerge long before the traditional clinical thresholds for diagnosis are met. The most rigorous formulation of this life-course concept is the cumulative-exposure or “कोलेस्ट्रॉल-वर्षकोलेस्ट्रॉल-इयर्स एक संचयी-एक्सपोज़र मीट्रिक है जो किसी व्यक्ति के औसत एलडीएल-सी स्तर (मिलीग्राम/डीएल में) को उस स्तर को वहन किए गए वर्षों की संख्या से गुणा करती है, जो तंबाकू के लिए पैक-इयर्स के समान है। यह अवधारणा मानती है कि यह एट्रोस्क्लेरोसिस (धमनी का कठोर होना) के विकास और उसकी गंभीरता को निर्धारित करने वाला कोई एक माप नहीं, बल्किApoB-युक्त लिपोप्रोटीन का कुल जीवनभर का बोझ है।.” model, in which the integral of plasma apoB-particle concentration over time predicts both the timing and severity of clinical events [7], [9].
This review provides a comprehensive synthesis of the pathophysiology, anatomical distribution, and functional consequences of subclinical vascular disease across the human arterial tree, with particular attention to (i) the divergent biology of large-artery atherosclerosis and cerebral small vessel disease; (ii) the causal centrality of apoB-containing lipoproteins and the contribution of Lp(a), inflammation, and clonal hematopoiesis; (iii) sex-specific phenotypes; (iv) emerging detection modalities; and (v) the trial-based evidence that subclinical disease is reversible when addressed early and aggressively.
2. Apolipoprotein B–Containing Lipoproteins as the Necessary Causal Driver
2.1 The Mendelian-Randomization Synthesis
मेंडेलियन रैंडमाइजेशनमेंडेलियन रैंडमइजेशन एक चतुर शोध पद्धति है जो लोगों के जन्मजात जीन्स को एक प्राकृतिक प्रयोग के रूप में उपयोग करती है।. (MR) provides one of the most rigorous forms of causal inference available outside यादृच्छिक नियंत्रित परीक्षणएक यादृच्छिक नियंत्रित परीक्षण पूरी तरह से संयोग से लोगों को एक उपचार या तुलना समूह में असाइन करता है, फिर दोनों समूहों का अनुसरण करता है।.. By exploiting the random allocation of alleles at conception, MR studies estimate the lifelong effect of a genetically determined exposure unconfounded by विपरीत कारणताप्रति-कार्यकारण तब होता है जब तीर दूसरी दिशा में इशारा करता है — यानी जोखिम के कारण बीमारी होने के बजाय, बीमारी के कारण जोखिम पैदा हुआ।., lifestyle covariates, or measurement error. Ference and colleagues analyzed 50 polymorphisms across nine LDL-related genes in 312,321 participants and established that each 1 mmol/L (≈38.7 mg/dL) genetically lower LDL-C confers a सापेक्ष जोखिमसापेक्ष जोखिम दो समूहों की तुलना करता है: इस समूह में उस समूह की तुलना में 30 प्रतिशत कम दिल के दौरे पड़े।. reduction of approximately 54.5 percent for कोरोनरी हृदय रोगकोरोनरी हृदय रोग हृदय की मांसपेशी को रक्त की आपूर्ति करने वाली धमनियों का संकुचन या अवरोध है, जो एथेरोस्क्लेरोटिक प्लाक के जमा होने के कारण होता है; यह दुनिया भर में दिल के दौरे और कार्डियक मौत का प्रमुख कारण है।. — an effect roughly three times larger per unit एलडीएलएलडीएल, या कम घनत्व वाले लिपोप्रोटीन, मुख्य कण हैं जो आपके रक्त के माध्यम से कोलेस्ट्रॉल ले जाते हैं — और मुख्य कण हैं जो धमनी की दीवारों में फंस जाते हैं।. than that of statins initiated in mid-life [1].
द खुराक-प्रतिक्रिया संबंधA dose-response relationship describes how the magnitude of a biological effect changes as the amount of an exposure (such as weekly exercise minutes) increases; in this article, resistance training shows a non-linear dose-response for mortality, with benefits plateauing around 120 minutes per week and a J-shaped curve emerging at very high volumes in older women. is log-linear with no detectable threshold, supporting a cumulative-exposure model. A second MR study using polymorphisms in PCSK9PCSK9 आपके यकृत (लिवर) द्वारा निर्मित एक प्रोटीन है जो उन डॉकिंग पोर्ट्स को नष्ट कर देता है जिनका उपयोग आपका यकृत आपके रक्त से कोलेस्ट्रॉल को बाहर निकालने के लिए करता है।., HMGCRHMGCR is the gene for HMG-CoA reductase, the enzyme that performs the rate-limiting step in making cholesterol. It is the exact target of every statin., और NPC1L1NPC1L1 is the transporter in your intestine that absorbs cholesterol from food and bile. Ezetimibe blocks it. demonstrated that risk reduction tracks closely with the magnitude and duration of LDL-C lowering, supporting the conclusion that integrated lifetime exposure to apoB-containing lipoproteins is a central determinant of atherogenesis, while the specific molecular pathway through which LDL-C is lowered is less important for ASCVD risk reduction [3]. A 2017 European Atherosclerosis Society Consensus Statement reviewed more than 200 genetic, prospective epidemiologic, and randomized intervention studies and concluded that LDL fulfills the Bradford Hill criteriaThe 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. for causality in ASCVD [4], and the 2020 EAS update extended this conclusion to apoB-containing lipoproteins generally [19].
2.2 ApoB as the Unifying Particle
Each major atherogenic lipoprotein particle — वीएलडीएलवीएलडीएल, या वेरी-लो-डेंसिटी लिपोप्रोटीन, वह कण है जिसे आपका यकृत (लिवर) ट्राइग्लिसराइड्स को शरीर के बाकी हिस्सों में भेजने के लिए बनाता है।., आईडीएलआईडीएल, या इंटरमीडिएट-डेंसिटी लिपोप्रोटीन, एक ऐसा कण है जो एक बड़े ट्राइग्लिसराइड-ले जाने वाले कण के एलडीएल कण में सिकुड़ने की प्रक्रिया के बीच में बनता है।., LDL, Lp(a), and काइलोमाइक्रोनकाइलोमाइक्रोन एक बहुत बड़ा कण है जो भोजन से मिलने वाली वसा को आपकी आंतों से आपके रक्तप्रवाह में ले जाता है।. remnants — carries a single apolipoprotein B molecule: एपोबी-१००ApoB-100 एपolipoprotein B का पूर्ण-लंबाई वाला रूप है जो LDL, VLDL, IDL और अवशेष लिपोप्रोटीन पर पाया जाता है; इसके धनात्मक रूप से आवेशित अमीनो-अम्ल डोमेन धमनी की दीवार में ऋणात्मक रूप से आवेशित प्रोटीग्लाइकेन साइड चेन से आयनिक रूप से बंधते हैं, जो कण को अंतःस्तर (इन्टीमा) में भौतिक रूप से फंसाते हैं और पट्टिका (प्लाक) के निर्माण की शुरुआत करते हैं।. for hepatically derived particles and apoB-48ApoB-48 एपolipoprotein B का एक छोटा आइसोफॉर्म है जो आंत में उत्पन्न होता है और विशेष रूप से काइलोमाइक्रोन और उनके अवशेषों पर पाया जाता है; ApoB-100 के विपरीत, उपवास की स्थिति में मानक नैदानिक ApoB परख द्वारा इसे नहीं मापा जाता है, जिसका अर्थ है कि नियमित ApoB परीक्षण आहार वसा अवशोषण के बजाय यकृत से उत्पन्न लिपोप्रोटीन से एथरोोजेनिक कण भार को दर्शाते हैं।. for intestinal remnants. अपोबीApoB एक प्रोटीन है जो हर उस कोलेस्ट्रॉल कण के बाहर मौजूद होता है जो आपकी धमनी की दीवार में फंस सकता है और पट्टिका (प्लाक) का कारण बन सकता है। उनमें से प्रत्येक कण में ठीक एक ApoB होता है।. therefore counts एथोजेनिक कणएथरोोजेनिक कण एपीओबी-युक्त लिपोप्रोटीन हैं—जिनमें एलडीएल, आईडीएल, वीएलडीएल, और लिपोप्रोटीन (ए) शामिल हैं—जो पट्टिका (प्लाक) वृद्धि को शुरू करने और बनाए रखने के लिए धमनी की दीवार में प्रवेश कर सकते हैं और वहाँ रुक सकते हैं; लेख इस शब्द का उपयोग यह वर्णन करने के लिए करता है कि पट्टिका को कम करने के लिए पर्याप्त रूप से और लगातार क्या कम किया जाना चाहिए।., whereas LDL-C measures a cargo whose ratio to the carrier varies with metabolic state. In the यूके बायोबैंकUK Biobank holds detailed genetic, lifestyle, and health data on half a million British volunteers, linked to their medical records. analysis of 389,529 participants, apoB was the dominant predictor of myocardial infarction; LDL-C and non-HDL-C lost statistical significance after adjustment for apoB [5]. In states of मतभेदपूर्ण प्रविष्टि के लिए ApoB डिस्कोर्डेंस देखें।. — where LDL-C is normal but particle number is high, as in मेटाबोलिक सिंड्रोममेटाबोलिक सिंड्रोम पांच समस्याओं का एक समूह है जो एक साथ होने की प्रवृत्ति रखते हैं: बड़ा कमर घेरा, उच्च ट्राइग्लिसराइड्स, कम एचडीएल, उच्च रक्तचाप और उच्च रक्त शर्करा। इनमें से तीन या अधिक का होना।. और इंसुलिन प्रतिरोधकताइंसुलिन रेजिस्टेंस तब होता है जब आपकी कोशिकाएं इंसुलिन का अच्छी तरह से जवाब देना बंद कर देती हैं, इसलिए आपके अग्नाशय (पैंक्रियास) को वही काम करने के लिए और अधिक इंसुलिन का उत्पादन करना पड़ता है।. — apoB unmasks substantial atherogenic risk that an LDL-C-only strategy would miss [6].
2.3 Cumulative Exposure and the “Cholesterol-Years” Concept
The cumulative-exposure model treats ASCVD risk as a function of the integral of plasma LDL-C concentration over time, analogous to “पैक-वर्षPack-years is a standardized measure of cumulative tobacco exposure calculated by multiplying the number of packs smoked per day by the number of years of smoking; the article uses it as the conceptual model for thinking about cumulative apoB exposure, noting that both metrics are imperfect summaries of lifetime exposure that carry more prognostic weight than a single current measurement.” for tobacco. Several analyses support a dose–time relationship between LDL-C exposure and ASCVD events. The “threshold” for clinically apparent disease in men has been described in some analyses as approximately 5,000 mg/dL·years — for example, LDL 125 mg/dL × 40 years, corresponding to age ~50 in modern Western populations — but the exact LDL-year value at which clinical disease emerges is model-dependent and should be presented as illustrative rather than as a universal biological cutoff [7], [9].
The “LDL पट्टिका-वर्षPlaque-years is a measure of cumulative lifetime exposure to LDL cholesterol, calculated as the integral of LDL-C concentration over time (approximated as LDL-C × age), used to quantify the total atherogenic burden an artery wall has experienced. Research has identified heuristic thresholds—around 5,000 for low risk and above 14,000 for very high risk—that correspond to progressively greater prob…” framework reframes prevention quantitatively around cumulative burden. For example, lifelong LDL of 70 mg/dL × 80 years yields ≈5,600 mg/dL·years; LDL 130 mg/dL × 50 years yields ≈6,500 mg/dL·years; and untreated heterozygous पारिवारिक हाइपरकोलेस्ट्रॉलमियापारिवारिक हाइपरकोलेस्ट्रोलेमिया, या एफएच, एक आनुवंशिक स्थिति है जहाँ यकृत रक्त से कोलेस्ट्रॉल को ठीक से साफ़ नहीं कर पाता है। जन्म से ही स्तर बहुत अधिक होते हैं।. patients with LDL of 250 mg/dL exceed common illustrative thresholds by their early thirties. These calculations are useful for communicating dose–time biology and for explaining why untreated heterozygous FH carries a high lifetime CHD risk, but they should not be presented as validated individual-risk thresholds [7], [8], [9].
| श्रेणी | Cumulative LDL exposure | Approximate trajectory | Illustrative lifetime CHD risk |
| कम | <5,000 mg/dL·yr | LDL 70 × 70 yr | <5% |
| मध्यवर्ती | 5,000–8,000 mg/dL·yr | LDL 100 × 60 yr | 10–20% |
| उच्च | 8,000–12,000 mg/dL·yr | LDL 130 × 65 yr | 30–50% |
| Very high | >12,000 mg/dL·yr | LDL 190 × 65 yr (HeFH) | >50% by age 60 |
सारणी 1. Illustrative cumulative LDL-cholesterol exposure categories and approximate lifetime coronary heart disease risk. Adapted from Ference et al. and Domanski et al. [7], [8], [9]. These categories are illustrative communication aids, not guideline-validated individual-risk thresholds.
2.4 Tsimane and Hadza: The Natural Experiment of Lifelong Low LDL
Kaplan and colleagues examined CAC scores in 705 त्सिमानेत्सिमाने बोलिवियाई अमेज़न की एक स्वदेशी शिकारी-बागवानी आबादी है, जिनकी पारंपरिक जीवनशैली—जो उच्च शारीरिक गतिविधि और लगभग 91 मिलीग्राम/डीएल के कम औसत एलडीएल कोलेस्ट्रॉल की विशेषता है—कोरोनरी कैल्सीफिकेशन की उल्लेखनीय रूप से कम दरों से जुड़ी है, जिसमें 40 वर्ष से अधिक उम्र के 85 प्रतिशत वयस्कों में कोई पता लगाने योग्य कोरोनरी कैल्शियम नहीं दिखाई देता है।. forager-horticulturalists of the Bolivian Amazon aged 40 to 94. The mean LDL-C was 91 mg/dL, and 85 percent of adults aged 40 and older had a CAC of zero, compared with approximately 50 percent of US adults of similar age in MESA. Sixty-five percent of those over 75 had a CAC of zero — the lowest level of coronary atherosclerosis ever measured in any population — and only 8 percent had a CAC ≥100, versus more than 50 percent in age-matched US populations [10].
This natural experiment supports the conclusion that maintaining relatively low LDL-C across the life course, combined with high physical activity and minimal धूम्रपानधूम्रपान आपकी रक्त वाहिकाओं की परत को नुकसान पहुँचाता है, रक्तचाप बढ़ाता है, रक्त को अधिक आसानी से थक्का बनाता है, और पट्टिका (प्लाक) के विकास को तेज़ करता है।., is associated with very low prevalence of coronary कैल्सीफ़िकेशनकैल्सीफिकेशन तब होता है जब कैल्शियम प्लाक में जमा हो जाता है, जिससे उसका एक हिस्सा सख्त और हड्डी जैसा हो जाता है।.. It should not be framed as proving that LDL-C ≤90 mg/dL virtually eliminates coronary atherosclerosis, because the Tsimane phenotype reflects multiple lifelong exposures and not LDL-C in isolation. The Hadza of Tanzania have been described as a physically active hunter-gatherer population with favorable cardiometabolic features in available studies, but direct CAC imaging has not been performed in this group; conclusions about the absence of clinical coronary disease in the Hadza are therefore inferential rather than direct [11].
2.5 Genetic Lifelong Low LDL: PCSK9 and ANGPTL3
Cohen and colleagues identified naturally occurring loss-of-function mutations in PCSK9 (R46L, Y142X, C679X) that lower LDL by 15–40 percent across the life course. Carriers of selected variants exhibited large reductions in CHD events, with the most striking estimates — including reductions approaching 88 percent for some variants — reflecting effect sizes that vary by variant and ancestry [12]. Such effect sizes far exceed what any pharmacologic intervention initiated in mid-life can achieve. Similarly, homozygous loss-of-function variants in एएनजीपीटीएल3ANGPTL3 is a protein that slows the breakdown of triglyceride-rich particles in the blood. produce hypobetalipoproteinemia with very low LDL and ट्राइग्लिसराइड्सट्राइग्लिसराइड्स आपके रक्त में और आपके शरीर के वसा भंडार में वसा का मुख्य रूप हैं।.; epidemiologic series describe markedly reduced ASCVD risk and favorable लिपिड प्रोफाइलएक रक्त परीक्षण पैनल जो कुल कोलेस्ट्रॉल, एलडीएल कोलेस्ट्रॉल, एचडीएल कोलेस्ट्रॉल और ट्राइग्लिसराइड्स को मापता है, जिसका उपयोग हृदय संबंधी जोखिम का आकलन करने और आहार या दवा के हस्तक्षेप के प्रभाव की निगरानी के लिए किया जाता है।. in such carriers, although event rates have not been quantified in randomized cohorts [13].
These genetic experiments establish a useful boundary condition: when lifelong apoB-particle burden is genetically low, atherosclerosis appears markedly suppressed even without pharmacologic intervention. Pharmacologic mimicry of these phenotypes — through PCSK9 monoclonal antibodies, siRNA agents, and ANGPTL3 inhibitors — has demonstrated additive event reduction on top of statin therapy. Analyses of फूरियरFOURIER ने कार्डियोवैस्कुलर बीमारी से पीड़ित और पहले से ही स्टैटिन ले रहे मरीजों में PCSK9 अवरोधक, इवोलocumab का परीक्षण किया।. and the FOURIER open-label extension support progressively lower event rates among patients achieving very low LDL, including LDL <20 mg/dL, without an excess safety signal over available follow-up [18].
2.6 Why Sustained Very Low LDL Markedly Reduces Atherogenesis
Endothelial ट्रांससाइटोसिसट्रांससाइटोसिस वह प्रक्रिया है जिसके द्वारा एक कोशिका एक तरफ से किसी वस्तु को उठाती है, उसे पार ले जाती है, और दूसरी तरफ छोड़ देती है।. of LDL into the इंटिमाइन्टिमा धमनी की दीवार की सबसे wewnętr (भीतरी) परत होती है, जो ठीक चिकनी परत के नीचे स्थित होती है।. is concentration-dependent, and proteoglycan-mediated retention — the response-to-retention paradigm of Tabas, Williams, and Borén — becomes less likely as apoB-particle flux falls [83]. Newborns have LDL-C ≈30 mg/dL, and atherosclerotic घावहृदय रोग विज्ञान में, एक घाव (लेशन्) एथेरोस्क्लेरोटिक प्लाक के एक अलग क्षेत्र को संदर्भित करता है जो कोरोनरी धमनी को सिकोड़ता है, जिसे आमतौर पर इसके कारण होने वाले लुमिनल अवरोध के प्रतिशत से वर्णित किया जाता है। लेख चार ऐसे अवशिष्ट घावों का वर्णन करता है जो सबसे महत्वपूर्ण का इलाज किए जाने के बाद स्टेंट स्वीकार करने के लिए पोत के व्यास में बहुत छोटे हैं।. are not typically detected at this stage; this should be interpreted as evidence that very low lifelong LDL-C is incompatible with the early steps of atherogenesis on a population scale, rather than as a claim that atherosclerosis is biologically impossible at any single LDL-C value. Cohorts with lifelong LDL <70 mg/dL (PCSK9 LOF, ANGPTL3 LOF, treated FH) demonstrate marked reductions in event rates, with IVUS-documented plaque regression at on-treatment LDL <60 mg/dL across the REVERSAL, ASTEROID, SATURN, and GLAGOV trials [14], [15], [16], [17].
फोरियर-ओलेThe 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. extended इवोलोक्यूमैबएवोलocumab (इवोलोक्यूमैब) एक इंजेक्टेबल कोलेस्ट्रॉल की दवा है जो PCSK9 इनहिबिटर परिवार से संबंधित है, और आमतौर पर इसे हर दो से चार सप्ताह में दिया जाता है।. follow-up for a median of approximately 5 years and reported continued event reduction at on-treatment LDL <20 mg/dL with no excess safety signal over available follow-up [18]. A formal demonstration of खुराक-प्रतिक्रियाएक खुराक-प्रतिक्रिया संबंध का अर्थ है कि किसी चीज़ की अधिक मात्रा एक लगातार ढलान में अधिक प्रभाव पैदा करती है।. without plateau at these very low LDL levels has not been firmly established, but available data are consistent with continued benefit and no offsetting toxicity through the lowest LDL achieved in trial populations to date.
2.7 Acknowledging and Rebutting the LDL-Skeptic Position
A small group of authors — most prominently Ravnskov, Diamond, and Kendrick — have argued that LDL is non-causal, citing observational studies in elderly populations in which LDL appears non-predictive (the so-called “लिपिड विरोधाभासThe lipid paradox refers to the observation in people in their 80s and 90s that the usual positive association between LDL cholesterol and heart disease weakens or even reverses, an apparent anomaly explained by reverse causation from illness lowering cholesterol, survivorship selection, and competing causes of death rather than any change in LDL's underlying biology.”). The standard rebuttals are well established. First, reverse causality dominates in late life: chronic illness, malabsorption, and frailty lower LDL, biasing the LDL–mortality association in cross-sectional analyses. Second, survivor biasSurvivor bias in the elderly paradox refers to the statistical artifact whereby people who reach old age with high LDL may represent a genetically hardy subset who were never vulnerable to LDL-driven atherosclerosis, making high LDL appear safe in that age group when the susceptible individuals already died younger. selects for genetically protected individuals among those reaching age 80 with high LDL. Third, attenuation of relative risk with age does not imply attenuation of पूर्ण जोखिमपरम जोखिम इस बात की वास्तविक संभावना है कि आपके साथ कुछ होगा, जिसे प्रतिशत के रूप में लिखा जाता है। यदि अगले दस वर्षों में दिल का दौरा पड़ने का आपका परम जोखिम 12 प्रतिशत है, तो इसका मतलब है कि आप जैसे हर 100 में से लगभग 12 लोगों को यह होगा।.; the absolute event rate increases dramatically with age. Fourth, the genetic and pharmacologic evidence is mutually corroborative across approximately twenty independent lines of investigation, satisfying triangulation criteria for causality [4], [6], [19]. The skeptic position rests almost entirely on observational data while ignoring the convergent genetic and randomized-trial evidence.
3. Structural Determinants and the Role of Vasa Vasorum in Atherogenesis
3.1 Critical Depth and the Lamellar Unit
In large-caliber systemic arteries, the metabolic demands of the thick wall exceed the capacity for simple oxygen diffusion from the ल्युमेनल्यूमेन रक्त वाहिका के अंदर का वह खुला चैनल है जहाँ वास्तव में रक्त बहता है।.. The “critical depth” is defined as the physiological limit of oxygen and nutrient diffusion from luminal blood, established by Geiringer at approximately 0.5 mm (≈500 μm), or roughly 29–30 lamellar units of the medial wall [78], [79]. Each lamellar unit consists of an elastic lamina and its associated layer of smooth-muscle cells and एक्स्ट्रासेलुलर मैट्रिक्सएक्स्ट्रासेल्युलर मैट्रिक्स कोलेजन और अन्य तंतुओं का मचान है जो ऊतक को एक साथ रखता है और धमनी की दीवार को उसकी ताकत देता है।., approximately 15 μm thick. Wall segments thicker than this threshold require an intrinsic microvascular network — the vasa vasorum — to maintain viability of the outer media and एड्वांटिशियाThe adventitia is the tough outermost layer of an artery, made largely of connective tissue, nerves, and the small vessels that feed the wall..
Vasa vasorum are categorized into vasa vasorum interna, which arise directly from the arterial lumen, and vasa vasorum externa, which originate from remote branches and penetrate the adventitia. Geiringer’s investigations established that vasa vasorum are abundant in the adventitia and outer third of the media, while the inner ≈0.5 mm (≈30 lamellar units) of the wall remains avascular and is supplied solely by luminal diffusion [79]. When the wall thickens because of atherosclerotic plaque or hypertensive hyperplasia, the diffusion distance increases, generating a hypoxic environment in the deeper layers. Hypoxia triggers HIF-1α–dependent angiogenic signaling, leading to proliferation of vasa vasorum that can penetrate the internal elastic lamina and enter the plaque itself, where they serve both as conduits for inflammatory cells and as fragile sources of इंट्राप्लाक हेमरेजइंट्राप्लाक हेमरेज (पट्टिका के भीतर रक्तस्राव) पट्टिका के अंदर रक्तस्राव है, जो इसमें विकसित होने वाली नाज़ुक छोटी वाहिकाओं से होता है।..
3.2 Extracranial vs. Intracranial Vascular Nourishment
The intracranial vasculature presents a unique architectural profile compared with the systemic circulation. Healthy intracranial arteries are characterized by a thinner tunica media, less abundant adventitia, and a relative paucity of elastic फाइबरफ़ाइबर पौधे के भोजन का वह हिस्सा है जिसे आपका शरीर पचा नहीं सकता है। यह बीन्स, ओट्स, सब्जियों, फलों और साबुत अनाज में पाया जाता है।.; many lack a well-defined external elastic lamina. A primary distinguishing feature is that intracranial vessels are bathed in nutrient-rich cerebrospinal fluid, which provides metabolic support through external diffusion and partly compensates for the relative absence of vasa vasorum early in life.
Modern autopsy and imaging studies have refined the historical view that vasa vasorum are absent in the brain. In one autopsy series of 50 cases, vasa vasorum were identified in 72 percent of patients, localized primarily in the tunica adventitia. Their distribution is markedly non-uniform: vasa vasorum are more frequently found in proximal segments — the vertebral arteries, basilar artery, and intracranial portion of the internal करोटिड धमनीThe carotid arteries run up either side of your neck and supply blood to your brain. — than in distal segments such as the middle cerebral or anterior cerebral arteries. Although atherosclerosis can occur in the absence of vasa vasorum, their development is strongly associated with the progression of intracranial disease: in the intracranial vertebral artery, the presence of adventitial vasa vasorum correlates with greater plaque load, denser intraplaque calcification, and more severe luminal स्टेनोसिसस्टेनोसिस का अर्थ है संकीर्णन — आमतौर पर इसे प्रतिशत के रूप में वर्णित किया जाता है, जैसे कि 70 प्रतिशत रुकावट।..
| Vessel type | Wall thickness | Vasa vasorum (early life) | Nutritional source |
| महाधमनीमहाधमनी आपके शरीर की सबसे बड़ी धमनी है। यह हृदय से रक्त को बाहर निकालकर छाती और पेट के रास्ते नीचे ले जाती है, और हर जगह शाखाएँ भेजती है।. / large systemic | >1.0 mm (often 1.5–2.0 mm) | Abundant in adventitia and outer media | Luminal diffusion + VV |
| Extracranial carotid | ≈0.6–1.0 mm | Present in adventitia | Luminal diffusion + VV |
| Intracranial ICA / VA | ≈0.2–0.3 mm | Sparse; mostly proximal segments | Luminal diffusion + CSF |
| Distal MCA / ACA | <0.2 mm; lacks EEL | Absent or rare | Luminal diffusion + CSF |
| Penetrating arterioles | 40–200 μm diameter | Absent | Luminal diffusion + interstitial fluid |
सारणी 2. Comparative architecture of arterial wall thickness, vasa vasorum density, and nutritional source across the systemic and cerebral circulations. EEL, external elastic lamina; ICA, internal carotid artery; VA, vertebral artery; MCA, middle cerebral artery; ACA, anterior cerebral artery; VV, vasa vasorum; CSF, cerebrospinal fluid.
4. Hemodynamic Forces and Plaque Localization
4.1 Laminar versus Disturbed Shear Stress
The focal nature of atherosclerosis is dictated by the interaction between blood flow and arterial geometry. The एंडोथेलियमएंडोथेलियम हर रक्त वाहिका के अंदर की अति-पतली, चिकनी परत है। यह केवल एक कोशिका मोटी होती है।. serves as a mechanosensor, translating physical stress into biological signaling through primary cilia, integrins, glycocalyx-mediated यांत्रिक पारगमनयांत्रिकसंवेदीरूपांतरण (मैकेनोट्रांसडक्शन) वह जैविक प्रक्रिया है जिसके द्वारा कोशिकाएं यांत्रिक उद्दीपनों—जैसे खिंचाव, दबाव, या अपरूपण प्रतिबल (शियर स्ट्रेस)—को जैव रासायनिक संकेतों में परिवर्तित करती हैं जो कोशिका के व्यवहार और जीन अभिव्यक्ति को बदलते हैं।., and ion channels (notably पिएज़ो1पिएज़ो1 (Piezo1) धमनी के एंडोथेलियल और चिकनी पेशी कोशिकाओं में पाया जाने वाला एक यांत्रिक-संवेदनशील आयन चैनल प्रोटीन है जो दबाव और दीवार के खिंचाव जैसे भौतिक बलों को इंट्रासेल्युलर रासायनिक संकेतों में परिवर्तित करता है, इस प्रक्रिया को यांत्रिक-पारगमन (mechanotransduction) कहा जाता है।. and TRPV4). In straight arterial segments, flow is laminar, generating high, unidirectional दीवार अपरोपण प्रतिबलवॉल शीयर स्ट्रेस (दीवार का कतरनी तनाव) बहते हुए रक्त द्वारा धमनी की आंतरिक सतह पर लगाया जाने वाला घर्षण बल है; धमनी के मोड़ों और द्विभाजन पर कम, दोलनशील, या बहुदिशात्मक शीयर स्ट्रेस एंडोथेलियल डिसफंक्शन (अन्तरकड़ा विसंगति) और प्लाक की शुरुआत को बढ़ावा देता है, जबकि सीधे खंडों में उच्च, एकसमान शीयर स्ट्रेस आमतौर पर सुरक्षार्थ होता है।. (typically 1–7 Pa, or 10–70 dyn/cm²). This environment maintains an atheroresistant endothelial phenotype characterized by sustained activation of एन्डोथेलियल नाइट्रिक ऑक्साइड सिंथेस (eNOS)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., phosphorylation of KLF2 and KLF4 transcription factors, and suppression of NF-κB signaling, with the result that नाइट्रिक ऑक्साइडनायट्रिक ऑक्साइड एक गैस है जो आपकी रक्त वाहिका की परत द्वारा बनाई जाती है ताकि वह वाहिका को आराम करने और चौड़ा होने के लिए कह सके।. production is high, ल्यूकोसाइट आसंजनवह प्रक्रिया जिसके द्वारा श्वेत रक्त कोशिकाएं रक्त वाहिकाओं की एंडोथेलियल सतह से चिपक जाती हैं, जो एथेरोजेनेसिस (एथेरोमा के गठन) में एक मुख्य प्रारंभिक चरण है; नाइट्रिक ऑक्साइड और एक बरकरार ग्लाइकोकैलिक्स आम तौर पर इस आसंजन को दबाते हैं।. is suppressed, and intimal permeability remains low [85].
In contrast, at branch points, bifurcations, and areas of high curvature, flow becomes “disturbed.” These atheroprone zones experience low time-averaged wall shear stress (often <0.4 Pa) and high oscillatory shear index, with the direction of frictional force reversing during the cardiac cycle. In disturbed-flow regions, the endothelium undergoes a phenotypic switch: tight junctions loosen, allowing increased transcytosis of LDL into the intima; expression of VCAM-1VCAM-1 एक चिपचिपा अणु है जो सूजन वाली रक्त वाहिका की परत पर प्रकट होता है और गुजरने वाली श्वेत रक्त कोशिकाओं को पकड़ लेता है ताकि वे दीवार में घुस सकें।., आईसीएएम-1आईकैम-1 एक ऐसा अणु है जो रक्त वाहिका की परत की सतह पर प्रकट होता है और वेल्क्रो की तरह काम करता है, जो गुजरने वाली प्रतिरक्षा कोशिकाओं को पकड़ लेता है।., E-selectin, and MCP-1 captures circulating monocytes and T-cells; प्रतिक्रियाशील ऑक्सीजन स्पीशीज़Reactive oxygen species are unstable oxygen-containing molecules produced as a by-product of normal metabolism. generation rises through NADPH oxidase activation; and the protective KLF2/eNOS axis is suppressed.
The seminal computational fluid dynamic study by Ku and colleagues at the human carotid bifurcation demonstrated tight spatial concordance between low-shear regions and intimal thickening — the founding empirical study of the hemodynamic theory of atherogenesis [71]. This pattern recurs at every branching point of the arterial tree: the proximal segments of the LAD and LCx, the carotid bulb, the abdominal aortic bifurcation, and the renal artery ostia all exhibit this geometry-dependent vulnerability.
4.2 Cellular Behavior in the Plaque Microenvironment
Once retained in the intima, LDL undergoes oxidative modification by myeloperoxidase, lipoxygenase, and reactive oxygen species. ऑक्सीकृत एलडीएलऑक्सीडाइज़्ड एलडीएल एक ऐसा एलडीएल कण है जो धमनी की दीवार में फंसने के बाद रासायनिक रूप से क्षतिग्रस्त हो जाता है।. is recognized by scavenger receptors (CD36, SR-A) on resident and newly recruited मैक्रोफेजमैक्रोफेज एक बड़ी प्रतिरक्षा कोशिका है जो मलबे और घुसपैठियों को निगल जाती है। इस नाम का शाब्दिक अर्थ है "बड़ा खाने वाला।", which internalize it and become फ़ोम कोशिकाएंफोम सेल एक ऐसी प्रतिरक्षा कोशिका है जिसने इतने सारे फँसे हुए कोलेस्ट्रॉल को खा लिया है कि वह सूज जाती है और माइक्रोस्कोप के नीचे झागदार दिखाई देती है।.. In early subclinical lesions, foam-cell death is balanced by एफेरोसाइटोसिसएफ़ेरोसाइटोसिस वह सफ़ाई प्रक्रिया है जिसके द्वारा प्रतिरक्षा कोशिकाएं अन्य कोशिकाओं को साफ़ करती हैं जिनकी मृत्यु हो चुकी है।. — the clearance of apoptotic cells by neighboring macrophages — but as the microenvironment becomes increasingly toxic, efferocytosis fails, apoptotic and necrotic debris accumulates, and a नेक्रोटिक कोरनेक्रोटिक कोर एक उन्नत पट्टिका (प्लाक) का मृत, गूदेदार केंद्र है, जो उन प्रतिरक्षा कोशिकाओं से बना है जिन्होंने फँसे हुए कोलेस्ट्रॉल को खा लिया था और फिर वहीं मर गईं।. forms. Vascular smooth-muscle cells (VSMCs) simultaneously switch from a contractile to a synthetic phenotype, migrating from the media into the intima where they secrete a collagen-rich फाइब्रस कैपफाइब्रस कैप ऊतक की वह मजबूत परत है जो प्लाक को ढकती है और उसके चिकने क्रोड को रक्त प्रवाह से अलग करती है।. that initially stabilizes the lesion. The balance between cap-thickening repair and core-expanding inflammation defines whether a plaque remains stable or progresses to vulnerability [82], [83], [84].
5. Endothelial Dysfunction as the Earliest Detectable Lesion
Endothelial dysfunction precedes any structural lesion detectable by carotid intima-media thickness (CIMT)Carotid intima-media thickness is an ultrasound measurement of the combined thickness of the inner two layers of the carotid artery wall in the neck; a faster rate of thickening indicates accelerating atherosclerosis, and it is used as a surrogate marker for cardiovascular risk in trials such as ELITE., coronary artery calcium scoring, or angiography. It is functional, dynamic, and partially reversible — and therefore represents the earliest practical window for primordial intervention.
5.1 Flow-Mediated Dilation
Brachial प्रवाह-मध्यस्थता फैलाव (FMD)Flow-mediated dilation is a non-invasive ultrasound measurement of how much a conduit artery — typically the brachial artery — widens in response to increased blood flow, serving as a marker of endothelial nitric oxide signaling and endothelial function., measured by ultrasound after a 5-minute forearm cuff अवरोधOcclusion is the partial or complete blockage of a blood vessel, preventing normal blood flow; a coronary occlusion reduces or cuts off oxygen delivery to the heart muscle supplied by that artery., quantifies endothelium-dependent (largely nitric-oxide-mediated) vasodilation. Lower FMD is associated with increased cardiovascular risk, but FMD is protocol-dependent and no single universal cutoff applies across laboratories; values below approximately 5–7 percent are commonly treated as abnormal in research contexts. In the Multi-Ethnic Study of Atherosclerosis, FMD added independent prognostic information beyond Framingham risk and CIMT [33]. FMD is impaired in subjects with even mildly elevated LDL, इंसुलिनइंसुलिन एक हॉर्मोन है जो आपके अग्नाशय (पैंक्रियाज़) द्वारा बनाया जाता है। इसका मुख्य काम आपके खून से शुगर को बाहर निकालकर ईंधन के लिए आपकी कोशिकाओं में पहुँचाना है।. resistance, untreated उच्च रक्तचापहाइपरटेंशन उच्च रक्तचाप के लिए चिकित्सीय शब्द है।., or chronic exposure to particulate air pollution.
5.2 Reactive Hyperemia Index
The reactive hyperemia index (RHI), measured non-invasively by digital plethysmography (EndoPAT), reflects microvascular एंडोथेलियल फ़ंक्शनरक्त वाहिकाओं की आंतरिक परत की वह क्षमता जो वैस्कुलर टोन, सूजन और थक्के जमने को नियंत्रित करती है; स्वस्थ एंडोथेलियल कोशिकाएं धमनियों को शिथिल रखने और प्लाक के निर्माण के प्रति प्रतिरोधी बनाए रखने के लिए नाइट्रिक ऑक्साइड छोड़ती हैं।. in the fingertip after reactive hyperemia. An RHI threshold around 1.67 has been used to identify coronary endothelial dysfunction or early coronary atherosclerosis in selected cohorts; sensitivity and specificity depend on the population and the reference standard [34]. RHI is operator-independent, has good reproducibility, and has been used as an outcome in lifestyle and pharmacologic intervention trials.
5.3 Glycocalyx Degradation
द एंडोथेलियल ग्लाइकोकेलिक्सएंडोथेलियल ग्लाइकोकेलिक्स ग्लाइकोप्रोटीन और प्रोटीोग्लाइकोन की एक पतली, जेल जैसी परत है जो रक्त वाहिकाओं की आंतरिक सतह को रेखाबद्ध करती है; यह एक चयनात्मक बाधा के रूप में कार्य करती है जो परिसंचारी लिपोप्रोटीन और धमनी की दीवार के बीच सीधे संपर्क को सीमित करती है, और अशांत या उच्च-वेग वाले रक्त प्रवाह द्वारा विघटन के प्रति संवेदनशील होती है।. is a 0.5–3 μm gel-like surface layer composed of proteoglycans (हेपेरान सल्फेटहेपरन सल्फेट एक नकारात्मक रूप से आवेशित ग्लाइकोसामिनोग्लाइकन है, जो कॉनड्रोइटीन सल्फेट के समान, धमनी बाह्य कोशिका मैट्रिक्स में प्रोटीयोग्लाइकन पर पाया जाता है; कॉनड्रोइटीन सल्फेट के साथ-साथ, यह ApoB-100 युक्त लिपोप्रोटीन के इलेक्ट्रोस्टैटिक बंधन में भाग लेता है जो पट्टिका गठन की शुरुआत करता है।., कोंड्रॉइटीन सल्फेटकोंड्रोइटिन सल्फेट एक ऋणावेशित ग्लाइकोसामिनोग्लाइकन श्रृंखला है जो बिग्लिकन और वर्सिकन जैसे धमनी प्रोटियोग्लाइकन से जुड़ी होती है; यह एलडीएल कणों पर धनावेशित ApoB-100 प्रोटीन से आयनिक रूप से जुड़ती है, उन्हें सबएंडोथेलियल स्थान में जकड़ती है और एथेरोस्क्लेरोटिक प्रक्रिया को शुरू करती है।.), glycoproteins (syndecan-1), and adsorbed plasma प्रोटीनप्रोटीन वह पोषक तत्व है जिसका उपयोग आपका शरीर मांसपेशियों और ऊतकों को बनाने और उनकी मरम्मत करने के लिए करता है।.. It modulates LDL transcytosis, leukocyte rolling, and shear-stress mechanotransduction. Glycocalyxग्लाइकोकैलिक्स रक्त वाहिकाओं की आंतरिक सतह पर चीनी से भरपूर एक नाजुक आवरण है, जो रक्त और कोशिकाओं के बीच एक प्रकार की जेल परत है।. degradation — driven by oxidized LDL, हाइपरग्लाइसीमियाAbnormally elevated blood glucose concentration; included as one of the modifiable risk factors in the PDAY scoring system because it accelerates arterial lesion progression in adolescents and young adults., TNF-α, and reactive oxygen species — exposes adhesion molecules and increases intimal lipoprotein flux. Glycocalyx thinning, detectable by sublingual sidestream dark-field imaging and by elevated plasma syndecan-1 and hyaluronan, occurs before measurable FMD impairment and is among the earliest detectable abnormalities in subclinical disease [35], [36].
5.4 Microvascular Dysfunction Preceding Macrovascular Disease
कोरोनरी प्रवाह आरक्षितकोरोनरी प्रवाह रिजर्व, आराम की स्थिति के दौरान हृदय की धमनियों के माध्यम से रक्त प्रवाह की तुलना हृदय के कठिन परिश्रम करने के समय होने वाले प्रवाह से करता है।. (CFR) below 2.0 by positron emission tomographyPositron emission tomography, or PET, uses a mildly radioactive tracer to show which tissues are metabolically busy., below 2.5 by transthoracic Doppler, or below 2.0 by cardiac magnetic resonance is independently predictive of cardiovascular events even in the absence of obstructive epicardial disease. Microvascular endothelial dysfunction can occur with normal coronary एंजियोग्रामएंजियोग्राम एक ऐसी जाँच है जिसमें डॉक्टर आपकी धमनियों में एक पतली नली डालते हैं और डाई डालते हैं, ताकि एक्स-रे पर धमनियों के अंदर का हिस्सा दिखाई दे सके।., providing the substrate for the syndrome of इस्क्रीमियाइस्कैमिया (अल्प रक्तता) तब होता है जब किसी ऊतक को उसके कार्य के लिए पर्याप्त रक्त और ऑक्सीजन नहीं मिल पाती है।. with non-obstructive कोरोनरी धमनियांकोरोनरी धमनियां वे छोटी रक्त वाहिकाएं हैं जो आपके हृदय के बाहरी हिस्से को घेरती हैं और स्वयं हृदय की मांसपेशियों को पोषण देती हैं।. (INOCA), discussed in Section 8 [37].
6. Anatomical Mapping of Subclinical Vascular Disease
Atherosclerosis is a systemic but non-uniform disease, favoring specific anatomical sites characterized by complex geometry and disturbed flow. Precise mapping across vascular beds reveals the predictable, geometry-dependent pattern of plaque localization.
6.1 Cerebrovascular and Cervical Beds
In the neck, the carotid bifurcation and the proximal internal carotid artery are the primary sites for early plaque development, owing to flow separation, recirculation, and low oscillatory shear at the carotid bulb. Within the cranium, disease is most frequently observed in the intracranial ICA (carotid siphon) and the proximal segments of the major branches of the circle of Willis. Autopsy series indicate that intracranial atherosclerosis lags extracranial disease by approximately 15 to 20 years; stable lesions are more common in the ICA, while more dynamic, progressive lesions are found in the MCA, ACA, and posterior cerebral arteries.
Importantly, intracranial atherosclerotic disease (ICAD)Intracranial atherosclerotic disease is the buildup of atherosclerotic plaque within the arteries inside the skull, narrowing vessels that supply brain tissue and contributing to stroke, chronic hypoperfusion, and cognitive impairment. accounts for approximately 9 percent of स्ट्रोक्सस्ट्रोक तब होता है जब मस्तिष्क के किसी हिस्से में रक्त का प्रवाह रुक जाता है, जो या तो किसी रुकावट के कारण होता है या खून बहने के कारण।. in white populations but 30 to 50 percent of strokes in East Asian, Black, and Hispanic populations [73], [74]. This racial disparity persists after adjustment for traditional जोखिम कारकजोखिम कारक वह है जो आपके किसी बीमारी से पीड़ित होने की संभावना को बढ़ाता है — उच्च कोलेस्ट्रॉल कण, उच्च रक्तचाप, धूम्रपान, मधुमेह, परिवार का इतिहास।., suggesting underlying genetic and structural contributions. The SAMMPRIS trial established medical management as superior to stenting for symptomatic ICAD with ≥70 percent stenosis [73].
6.2 Coronary Vasculature and Aorta
Coronary atherosclerosis typically initiates in the proximal segments of the epicardial arteries, with the proximal LAD showing the highest plaque prevalence — particularly within the first 40 mm — owing to its acute take-off angle and the high flow disturbance generated at the bifurcations of diagonal and septal branches. Bifurcations of the LAD with diagonals, the LCx with obtuse marginals, and the RCA with the posterior descending artery all show predilection at the lateral, low-shear walls of the side branches.
The Pathobiological Determinants of Atherosclerosis in Youth (PDAY) study confirmed that वसायुक्त रेखाएँफैटी स्ट्रीक एथेरोस्क्लेरोसिस का सबसे शुरुआती दृश्य चरण है - धमनी की परत के ठीक नीचे कोलेस्ट्रॉल से भरी प्रतिरक्षा कोशिकाओं का एक सपाट पीला धब्बा।. and raised lesions are present in the coronaries of individuals as young as 15–34 years. In the aorta, a clear gradient of susceptibility exists: the abdominal aorta is more severely affected than the thoracic aorta, with the highest concentration of plaques occurring in the distal abdominal aorta and at the aortic bifurcation.
6.3 Renal and Mesenteric Arteries
Atherosclerotic renal artery stenosis (ARAS) accounts for approximately 90 percent of renal artery stenosis cases and primarily involves the renal artery ostia and the proximal 2 cm of the main renal artery. By contrast, fibromuscular dysplasia, which accounts for the remaining ≈10 percent, typically affects the middle and distal segments or intrarenal branches. Mesenteric artery disease — involving the celiac trunk and the superior and inferior mesenteric arteries — also occurs most often at the aortic origins, where flow turbulence is greatest.
6.4 Lower Extremity and Pelvic Arteries
Peripheral arterial disease follows a predictable progression from elastic to muscular arteries. Atherosclerosis typically appears first in the suprainguinal elastic arteries (aorta and iliacs) before progressing to the infrainguinal muscular arteries (femoral, popliteal, and tibial). Pelvic vascular disease frequently involves the internal pudendal artery (IPA), where significant stenosis or occlusion has been documented in approximately 54 percent of men screened for कोरोनरी धमनी रोगकोरोनरी धमनी रोग (कोरोनरी आर्टरी डिज़ीज़) हृदय की मांसपेशी को रक्त पहुँचाने वाली धमनियों में प्लाक का जमाव है।. — an extraordinary prevalence reflecting the small caliber and shared risk-factor exposure of these vessels. The distal branches of the IPA, including the cavernosal arteries, are uniquely susceptible because of their small diameter (0.5–1 mm), as discussed in Section 9.
7. Differentiation of Large-Artery Atherosclerosis and Cerebral Small Vessel Disease
The distinction between classic atherosclerosis and cerebral small vessel disease (cSVD)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. is fundamental to understanding the divergent mechanisms of vascular injury across the human body.
7.1 Why Penetrating Arterioles Do Not Develop Classic Atherosclerosis
The penetrating arterioles (40–200 μm in diameter) that supply the deep brain — basal ganglia, thalamus, internal capsule, and periventricular white matter — do not exhibit the eccentric, lipid-rich plaquesएक एथेरोस्क्लेरोटिक घाव जिसका मुख्य भाग कैल्शियम या रेशेदार ऊतक के बजाय कोलेस्ट्रॉल एस्टर और इंफ्लेमेटरी लिपिड से युक्त होता है; लेख में उल्लेख किया गया है कि ऐसे प्लाक गहन उपचार के प्रति अत्यधिक संवेदनशील होते हैं और विकर्ण शाखा के उद्गम पर नाटकीय 65-प्रतिशत-बिंदु प्रतिगमन लिपिड-समृद्ध घाव के उलट होने के अनुकूल है।. typical of large-vessel atherosclerosis. Three structural and biological factors explain this divergence:
First, structural simplicity: these vessels lack the multi-layered lamellar structure and the well-defined internal and external elastic laminae that support classic plaque architecture. Second, रक्त-मस्तिष्क बाधाThe 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. specialization: the एंडोथेलियल कोशिकाएंसभी रक्त वाहिकाओं की आंतरिक सतह को अस्तर करने वाली कोशिकाओं की पतली परत; वे संवहनी स्वर को नियंत्रित करती हैं, थक्के जमने से रोकती हैं, और धमनी की दीवार में पदार्थों के मार्ग को नियंत्रित करती हैं — और उनका कार्यकुशल न होना एथेरोस्क्लेरोसिस में एक प्रारंभिक, महत्वपूर्ण कदम है।. of these vessels are specialized components of the neurovascular unit, with tight junctions formed by claudin-5, occludin, and ZO-1, supported by pericytes, astrocyte end-feet, and a unique metabolic environment that differs fundamentally from systemic vessels. Third, the absence of vasa vasorum: these vessels rely entirely on luminal and external diffusion and do not possess the intrinsic microvascular network that can be co-opted for plaque nourishment in larger arteries.
7.2 The Spectrum of Small Vessel Pathology
Instead of classic atherosclerosis, penetrating arterioles develop a distinct set of pathologies collectively termed cerebral small vessel disease. Lipohyalinosis, originally characterized by C. Miller Fisher as “segmental arteriolar wall disorganization,” involves accumulation of waxy, glassy lipid and protein aggregates within the vessel wall, fibrinoid necrosis of medial smooth-muscle cells, and luminal narrowing. It is driven primarily by chronic hypertension and is the principal substrate of lacunar infarcts in the lenticulostriate, thalamoperforating, and pontine penetrating arterioles.
Hyperplastic arteriolosclerosis involves concentric “onion-skin” thickening of the wall due to smooth-muscle proliferation and basement-membrane duplication and is more characteristic of malignant or accelerated hypertension. Microatheroma refers to occlusive lesions in larger penetrating vessels (200–800 μm); these share some features with atherosclerosis (foam cells, lipid retention) but typically occur at the proximal origin of the perforator and reflect the spillover of large-artery disease into branches.
Cerebral amyloid angiopathy (CAA)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. involves progressive deposition of β-amyloid (Aβ) — predominantly Aβ40 and to a lesser extent Aβ42 — in the media and adventitia of cortical and leptomeningeal arterioles (typically <2 mm in caliber). CAA is independent of hypertension and is a major contributor to lobar microbleeds, superficial siderosis, and convexity subarachnoid hemorrhage [23], [24]. Pathologically advanced cSVD frequently shows a transition from endothelial dysfunction to BBB disruption: failure of the BBB allows toxic serum components — fibrinogen, IgG, complement — to extravasate into the brain, triggering perivascular inflammation, “forced dilatation,” and connective-tissue accumulation that leaves downstream vessels vulnerable to high-pressure damage.
8. Early-Life Evidence and Longitudinal Risk Trajectories
8.1 Napoli/FELIC: Fetal Fatty Streaks
The earliest documented atherosclerotic lesion in humans is fetal. Napoli and colleagues, in the FELIC (Fate of Early Lesions in Children) study, demonstrated that fatty streaks form in the aortic intima of fetuses, with intimal accumulation of LDL and its oxidation preceding monocyte recruitment. Fetal fatty-streak formation was greatly enhanced by maternal hypercholesterolemia during pregnancy, suggesting that the maternal lipid environment programs offspring vascular vulnerability decades before clinical disease [52].
These observations transformed the conception of atherosclerosis from a disease of mid-life to a life-course disease initiated in utero, with the prenatal environment establishing the trajectory of subsequent intimal LDL accumulation.
8.2 PDAY and the Bogalusa Heart Study
द पीडीएवाई अध्ययनThe Pathobiological Determinants of Atherosclerosis in Youth (PDAY) study was a pathological study that examined the coronary arteries and aortas of young people aged 15–34 who died from unrelated causes such as accidents; it demonstrated that early atherosclerotic lesions — fatty streaks and more advanced plaques — were already present in most adolescents and young adults, decades before any cli… performed standardized autopsies on more than 3,000 individuals aged 15–34 who died of trauma, cataloguing the prevalence and extent of fatty streaks and raised lesions in the coronary arteries and aorta. Fatty streaks were present in essentially all aortas and in the coronaries of a majority by the late twenties; raised lesions appeared in approximately 20 percent of men aged 30–34. The study developed the PDAY risk score, which demonstrated that smoking, नॉन-एचडीएल कोलेस्ट्रॉलनॉन-एचडीएल कोलेस्ट्रॉल की गणना करना आसान है: आपका कुल कोलेस्ट्रॉल माइनस आपका एचडीएल। जो बचता है वह उन सभी कणों में मौजूद कोलेस्ट्रॉल है जो आपकी धमनियों को नुकसान पहुँचा सकते हैं।., and hypertension in youth are strong predictors of advanced calcification decades later.
द बोगलूस हार्ट स्टडीThe Bogalusa Heart Study examined the arteries of children and young adults who died in accidents in a Louisiana town. extended these observations to a longitudinal community-based cohort, demonstrating that risk factors measured at ages 5–17 predict subclinical morbidity in adulthood. Berenson and colleagues, in autopsy data from 204 youths aged 2–39 who died of trauma, documented aortic fatty streaks in approximately half of children aged 2–15, rising to nearly 100 percent by age 21; coronary fatty streaks in 8 percent of children aged 2–15 and 69 percent of those aged 26–39; and coronary raised lesions in 3 percent of those aged 6–15 and 30 percent of those aged 26–39. The number of cardiovascular risk factors directly correlated with the extent of both fatty streaks and fibrous plaques [53].
8.3 The CARDIA Study
The Coronary Artery Risk Development in Young Adults (CARDIA) study followed 5,115 participants from ages 18–30 across more than 35 years of follow-up. Several findings have shaped contemporary preventive cardiology. First, sustained exposure to even modestly elevated LDL-C and रक्तचापरक्तचाप आपके धमनी की दीवारों के खिलाफ दबाव बनाने वाले रक्त का बल है। इसे दो संख्याओं के रूप में लिखा जाता है, जैसे 120/80। ऊपर की संख्या तब का दबाव होती है जब आपका हृदय सिकुड़ता है, और नीचे की संख्या तब होती है जब वह आराम करता है।. during the twenties and thirties contributes to ASCVD risk independently of risk levels later in life. Second, by Year 25 (mean age 50), approximately 27.7 percent of participants had detectable coronary artery calcium and approximately 53 percent had abdominal aortic calcium. Third, participants who adopted healthy habits — diet, exercise, smoking cessation, weight maintenance — during young adulthood had significantly less subclinical disease in middle age, with absolute reductions in event risk substantially larger than what mid-life intervention can achieve.
8.4 Pediatric and Adolescent Atherosclerosis: Familial Hypercholesterolemia
Heterozygous familial hypercholesterolemia (HeFH; prevalence ≈1:250) presents with LDL-C of 190–400 mg/dL from birth, the result of रोगजनक वेरिएंटA pathogenic variant is a gene mutation that has been demonstrated to cause or substantially increase the risk of a specific disease; in the context of inherited cardiac risk, it refers to mutations in genes such as those underlying Familial Hypercholesterolemia that markedly elevate lifetime heart disease probability. में LDLRLDLR वह जीन है जो LDL रिसेप्टर का निर्माण करता है, वह डॉकिंग पोर्ट जिसका उपयोग आपका लिवर परिसंचरण से कोलेस्ट्रॉल कणों को बाहर निकालने के लिए करता है।., APOB, or rarely PCSK9. Untreated, HeFH carries an approximately 50 percent CHD risk by age 50 in men. CIMT is significantly elevated in HeFH children by age 8–10. The landmark trial by Wiegman and colleagues demonstrated that statin initiation between ages 8 and 18 normalized CIMT progression compared with peers [54]. The 20-year follow-up of that cohort (Luirink and colleagues) showed that early statin treatment reduced MI risk by approximately 75 percent compared with untreated parents — among the strongest demonstrations in any field of medicine that early, sustained intervention can fundamentally alter a genetically determined disease trajectory [55].
9. Functional Impact of Subclinical Vascular Disease in Young and Middle-Aged Adults
Subclinical atherosclerosis is often described as “silent,” yet rigorous research demonstrates measurable functional deficits well before traditional clinical thresholds are reached.
9.1 Cognitive Function and Neurovascular Decay
In the CARDIA cohort, higher levels of CAC and abdominal aortic calcium at ages 43–55 were significantly associated with worse scores on tests of psychomotor speed (Digit Symbol Substitution Test), sustained attention, and verbal memory. This relationship persists after adjustment for age, sex, education, and traditional risk factors, suggesting that advanced calcified lesions in mid-life reflect a lifetime of vascular stress that also affects the brain microvasculature and white-matter integrity. Intelligence at age 19 has been found to inversely correlate with carotid plaque status at age 60, an association likely mediated by the long-term influence of cognitive ability on socioeconomic status, healthcare access, and अनुपालनपालन का अर्थ है वास्तव में अपनी दवा को वैसे ही लेना जैसे वह लिखी गई थी, दिन-प्रतिदिन।. to healthy lifestyles.
9.2 Aerobic Capacity and Exercise Tolerance
The relationship between physical activity and subclinical disease is bidirectional. High हृदय-श्वसन क्षमताकार्डियोरेस्पिरेटरी फिटनेस यह बताती है कि कठिन व्यायाम के दौरान ऑक्सीजन का उपयोग करने के लिए आपका दिल, फेफड़े और मांसपेशियां कितनी अच्छी तरह एक साथ काम करते हैं। इसे अक्सर VO2 मैक्स के रूप में मापा जाता है।. in young adulthood protects against the development of CAC and increased CIMT 15 to 25 years later. Conversely, the presence of subclinical atherosclerosis subtly impairs exercise tolerance: subclinical disease reduces vascular reserve — the ability of arteries to dilate and increase flow during peak exertion — contributing to earlier fatigue and reduced V̇O₂ peak. Individuals with low cardiorespiratory fitness are two to three times more likely to die prematurely from ASCVD even when matched for traditional risk factors.
9.3 Sleep, Fatigue, and Mood
Extreme sleep durations (<6 or >8 hours) and poor subjective sleep quality are associated with increased CAC prevalence and higher pulse-wave velocity. Sleep-duration irregularity — variation greater than 120 minutes across a week — is linked to a 33 percent higher prevalence of high CAC burden. Circadian misalignment drives chronic low-grade inflammation and sympathetic nervous system activation, predisposing individuals to subclinical atherosclerosis. Although direct causal links to mood disorders are still emerging, the combination of vascular-driven fatigue, impaired sleep, and chronic inflammation contributes to reduced quality of life.
9.4 Erectile Dysfunction as a Sentinel Event: The Artery-Size Hypothesis
Erectile dysfunction (ED) is often the first clinical manifestation of systemic vascular disease. The internal pudendal artery (1–2 mm) and its cavernosal branches (0.5–1 mm) are markedly smaller than the proximal coronary arteries (3–4 mm), the internal carotid (5–7 mm), or the femoral artery (6–8 mm). According to the artery-size hypothesis articulated by Montorsi and colleagues, equivalent atherosclerotic प्लाक का बोझप्लाक का बोझ आपकी धमनियों में हर जगह प्लाك की कुल मात्रा है - न कि केवल सबसे खराब जगह पर।. produces hemodynamically significant stenosisA degree of coronary artery narrowing sufficient to reduce blood flow and cause downstream ischemia during stress, conventionally defined as 70% or greater luminal diameter reduction; below this threshold, standard stress tests typically read as normal even if dangerous soft plaque is present. in small vessels first, so the cavernosal circulation reaches the threshold for symptomatic compromise years before the coronary circulation does [80].
Men with vascular ED have a markedly higher prevalence of subclinical CAD; the COBRA trial reported that vasculogenic ED preceded the symptomatic onset of CAD by a mean of approximately 3 years (range 2 to 5 years) [80]. This temporal relationship makes ED a clinically actionable sentinel: every man presenting with vasculogenic ED warrants formal cardiovascular risk assessment, often including CAC scoring, lipid profiling with apoB and Lp(a), and consideration of antiplatelet and lipid-lowering therapy.
9.5 Renal Function and Renal Reserve
In young, non-hypertensive adults, renal function (estimated ग्लोमेर्ुलर निस्पंदनGlomerular 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. rate, eGFR) is independently associated with arterial stiffnessArterial 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. measured by brachial-ankle pulse wave velocity (baPWV). Mediation analysis indicates that eGFR mediates the relationship between both systolic and diastolic blood pressureDiastolic 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. and subclinical atherosclerosis, particularly in males, suggesting that elevated blood pressure influences cardiovascular health partly through early reduction in renal reserve, with secondary endocrine and oxidative changes that accelerate atherosclerotic progression.
10. Sex-Specific Differences in Subclinical Atherosclerosis
Cardiovascular disease has historically been studied in male-predominant cohorts, and the recognition of distinct female phenotypes has lagged the corresponding biology by decades. Several mechanisms produce sex-specific differences in subclinical disease.
10.1 Coronary Microvascular Dysfunction
Women are disproportionately affected by कोरोनरी माइक्रोवास्कुलर डिसफंक्शन (सीएमडी)कोरोनरी माइक्रोवैस्कुलर डिसफंक्शन हृदय की मांसपेशियों को रक्त की आपूर्ति करने वाली छोटी धमनियों और केशिकाओं (कैपिलरी) का बिगड़ा हुआ कार्य है, जिसके परिणामस्वरूप रक्त का प्रवाह कम हो जाता है और एंजियोग्राफ़ी में मुख्य कोरोनरी धमनियां सामान्य दिखने पर भी व्यायाम सहनशीलता कम हो जाती है।., which is the dominant mechanism of ischemia in 50–60 percent of women with angina and non-obstructive coronary arteries. The Women’s Ischemia Syndrome Evaluation (WISE) study established CMD as a major sex-specific subclinical phenotype with prognostic implications equivalent to obstructive CAD [38].
10.2 INOCA and MINOCA
Ischemia with non-obstructive coronary arteries (INOCA) refers to symptomatic ischemia in the presence of <50 percent coronary stenosis; approximately 70 percent of patients are women. MI with non-obstructive coronary arteries (MINOCA) refers to MI with <50 percent stenosis, accounts for 5–15 percent of all MIs, and is two to three times more common in women than men. Mechanisms include माइक्रोवैस्कुलर डिसफंक्शनमाइक्रोवेस्कुलर डिसफंक्शन हृदय की सबसे छोटी रक्त वाहिकाओं की बीमारी है, जो किसी भी एंजियोग्राम में देखने के लिए बहुत छोटी होती हैं।., plaque erosionPlaque erosion is when the lining over a plaque simply wears away and a clot forms, without the cap tearing open. (rather than rupture), epicardial vasospasm, and spontaneous coronary artery dissection. Diagnosis requires invasive coronary functional testing — acetylcholine provocation, adenosine-induced flow reserve, and intravascular imaging — modalities still inconsistently available outside specialized centers [39].
10.3 Pregnancy as a Vascular Stress Test
Adverse pregnancy outcomes — प्रीक्लेम्पसियाPreeclampsia is dangerously high blood pressure developing during pregnancy, often with protein in the urine., gestational hypertension, गर्भावधि मधुमेहGestational diabetes is high blood sugar that appears during pregnancy and usually resolves after delivery., preterm delivery — confer a 2- to 4-fold lifetime increase in cardiovascular events. Pregnancy is now recognized as a “physiological तनाव परीक्षणA stress test watches your heart while you exercise on a treadmill or bike, sometimes with imaging added.” that exposes latent vascular and metabolic dysfunction; preeclampsia in particular is associated with elevated CIMT, increased PWV, and altered endothelial function years to decades after the index pregnancy [40]. A 2020 American Heart Association scientific statement recommends incorporating pregnancy history into routine cardiovascular risk assessment for women.
10.4 Menopause Transition and Accelerated Subclinical Progression
The Study of Women’s Health Across the Nation (SWAN) demonstrated accelerated CIMT progression and arterial stiffening across the late perimenopause and early postmenopause, with median CIMT progression approximately doubling in the year before to year after the final menstrual period. एस्ट्रोजनएस्ट्रोजेन एक हार्मोन है, जो रजोनिवृत्ति से पहले महिलाओं में बहुत अधिक स्तर पर मौजूद होता है, जो रक्त वाहिकाओं, कोलेस्ट्रॉल और हड्डी को प्रभावित करता है।. withdrawal removes its tonic effects on lipid metabolism, endothelial function, and vascular smooth-muscle phenotype. The SWAN findings have driven the recognition that the रजोनिवृत्तिMenopause is when a woman's periods stop permanently, usually around age 51, as estrogen levels fall. transition is a vulnerable window for प्राथमिक रोकथामप्राथमिक रोकथाम किसी ऐसे व्यक्ति का इलाज करना है जिसे कभी दिल का दौरा या स्ट्रोक नहीं हुआ है, ताकि पहले को होने से रोका जा सके।. rather than a static post-event endpoint [41].
10.5 Spontaneous Coronary Artery Dissection
Spontaneous coronary artery dissection (SCAD)A non-atherosclerotic tearing of the inner wall of a coronary artery that creates a false channel compressing the true lumen, particularly affecting younger and middle-aged women; angiographic appearances can be subtle and may require intracoronary imaging to confirm. is responsible for a disproportionate share of तीव्र कोरोनरी सिंड्रोमएक्यूट कोरोनरी सिंड्रोम (ACS) हृदय में रक्त प्रवाह में किसी भी अचानक आई गिरावट — अस्थिर एनजाइना से लेकर पूर्ण दिल के दौरे तक — के लिए इस्तेमाल होने वाला एक व्यापक शब्द है, जो किसी प्लाक के अचानक फटने या कटने-छिलने के कारण होता है।. in young women: more than 90 percent of SCAD cases occur in women, particularly in the peripartum period and in those aged 40–55. Approximately half of SCAD patients have coexisting fibromuscular dysplasia. SCAD is non-atherosclerotic, but its identification has reshaped the differential diagnosis of MI in young women [42].
| लक्षणप्ररूप | Female-predominant? | तंत्र | Detection |
| INOCA | Yes (~70%) | Microvascular dysfunction; vasospasm | Acetylcholine provocation; CFR |
| मिनोका | Yes (2–3×) | Plaque erosion; SCAD; vasospasm | OCT; IVUS |
| SCAD | Yes (>90%) | Intramural hematoma in coronary wall | Coronary angio + OCT |
| Preeclampsia legacy | Female-only | Endothelial sensitization; HTN risk | Lifetime BP; CIMT |
| Menopause-accelerated CIMT | हाँ | Estrogen withdrawal | Serial CIMT; PWV |
तालिका 3. Female-predominant subclinical and clinical phenotypes of cardiovascular disease. CFR, coronary flow reserve; OCT, ऑप्टिकल कोहरेंस टोमोग्राफीऑप्टिकल कोहेरेंस टोमोग्राफी, या ओसीटी, एक प्रकाश-आधारित जांच को कोरोनरी धमनी में डालती है। यह अल्ट्रासाउंड की तुलना में लगभग दस गुना अधिक सूक्ष्म विवरण देख सकती है।.; IVUS, इंट्रावैस्कुलर अल्ट्रासाउंडइंट्रावैस्कुलर अल्ट्रासाउंड, या IVUS, कोरोनरी धमनी के भीतर पिरोए गए एक छोटे अल्ट्रासाउंड जांच का उपयोग करके दीवार की भीतर से तस्वीर लेता है।.; SCAD, spontaneous coronary artery dissection; CIMT, carotid इन्टीमा-मीडिया मोटाईइन्टिमा-मीडिया मोटाई, या आईएमटी, धमनी की अंदरूनी परतों की मोटाई का एक माप है, जिसे आमतौर पर गर्दन में अल्ट्रासाउंड के जरिए मापा जाता है।.; PWV, pulse wave velocity.
11. The Vascular–Neurodegenerative Interface: Atherosclerosis and Alzheimer’s Disease
The historical binary distinction between vascular dementia and Alzheimer’s disease (AD) is increasingly untenable. Vascular factors — both large-vessel atherosclerosis and small vessel disease — are now recognized as central contributors to the development and trajectory of AD pathology, and a substantial fraction of clinically diagnosed AD has mixed vascular and neurodegenerative pathology at autopsy.
11.1 Oligemia and Amyloid Clearance
Severe atherosclerosis of the circle of Willis is significantly more prevalent in AD brains than in age-matched controls. Reduced cerebral perfusion — “oligemia” rather than frank ischemia — facilitates accumulation of β-amyloid (Aβ) by both increasing its production and impairing its clearance through perivascular and glymphatic pathways. Aβ itself is vasoactive, producing constriction of cerebral arteries and further aggravating the oligemic state in a self-reinforcing cycle of neurovascular decay.
11.2 Blood–Brain Barrier and Hippocampal Damage
Recent work has documented that systemic atherosclerosis is associated with amyloid and tau pathology mediated by BBB dysfunction in the hippocampus [23]. Vascular damage produces endothelial and smooth-muscle apoptosis, exacerbating cerebral amyloid angiopathy and promoting perivascular tau accumulation. Macrophages within atherosclerotic plaques can process platelet-derived amyloid precursor protein into Aβ40 and Aβ42, providing a direct biological link between systemic ApoB-driven atherosclerosis and neurodegenerative disease.
12. Inflammation in Subclinical Atherogenesis
12.1 hs-CRP and Residual Inflammatory Risk
हाई-सेंसिटिविटी सी-रिएक्टिव प्रोटीन (hs-CRP)A blood test that detects low-grade systemic inflammation (typically 0.5–10 mg/L) by measuring CRP with greater precision than standard assays; levels above 3.0 mg/L indicate high cardiovascular risk, and a 30-year study of nearly 28,000 women found it predicted heart events more strongly than LDL cholesterol. integrates upstream interleukin-6 signaling and has been validated as an स्वतंत्र पूर्वानुमानकर्ताA variable that statistically forecasts an outcome—such as mortality—even after accounting for other known risk factors like age, BMI, and cholesterol through multivariable analysis. of vascular events in बृहस्पतिJUPITER ने ऐसे लोगों पर एक स्टैटिन का परीक्षण किया जिनका कोलेस्ट्रॉल सामान्य था लेकिन CRP बढ़ा हुआ था, जो छिपी हुई सूजन का संकेत देता है।. and multiple subsequent trials [28]. In statin-treated patients, “अवशिष्ट सूजन का जोखिमअवशिष्ट सूजन संबंधी जोखिम उन रोगियों में हृदय संबंधी घटनाओं की दरों में लगातार वृद्धि को संदर्भित करता है जिन्होंने पहले ही दिशानिर्देश-अनुशंसित एलडीएल-सी लक्ष्यों को प्राप्त कर लिया है लेकिन जिनमें एचएस-सीआरपी जैसे सूजन संबंधी मार्कर लगातार बढ़े हुए हैं; यह एथरोोजेनेसिस के दूसरे, समानांतर मार्ग का प्रतिनिधित्व करता है जिसे अकेले लिपिड-कम करने वाली दवाएं संबोधित नहीं करती हैं।.” — defined as hs-CRP ≥2 mg/L despite LDL <70 mg/dL — remains a powerful predictor of recurrent events; in many secondary-prevention cohorts, residual inflammatory risk now exceeds residual कोलेस्ट्रॉलकोलेस्ट्रॉल एक मोमी पदार्थ है जिसकी आपके शरीर को आवश्यकता होती है। यह कोशिका की दीवारों, हार्मोनों, विटामिन डी और आपके भोजन को पचाने वाले पित्त में जाता है। इसके बिना आपकी मृत्यु हो जाएगी।. risk in magnitude [29].
12.2 The IL-1β / IL-6 Axis: CANTOS
द Canakinumabकैनकिनुमाब एक मोनोक्लोनल एंटीबॉडी है जो इंटरल्यूकिन-1बी (IL-1β) को लक्षित करता है, जो एक प्रमुख भड़काऊ सिग्नलिंग प्रोटीन है; यह कैंटोस (CANTOS) परीक्षण में सक्रिय दवा थी, जहाँ इसने एलडीएल कोलेस्ट्रॉल को प्रभावित किए बिना कार्डियोवैस्कुलर घटनाओं को कम किया।. Anti-Inflammatory थ्रॉम्बोसिसथ्रॉम्बोसिस रक्त वाहिका के अंदर बनने वाला रक्त का थक्का है।. Outcome Study (कैंटोसCANTOS (कनाकिनुमाब एंटी-इंफ्लेमेटरी थ्रोम्बोसिस आउटकम्स स्टडी) एक बड़ा यादृच्छिक परीक्षण था जिसमें कनाकिनुमाब, जो सूजन संकेत IL-1β को रोकने वाली एक दवा है, की प्लेसीबो से तुलना की गई; इसकी पूर्वनिर्धारित 150 मिलीग्राम खुराक पर इसने एलडीएल कोलेस्ट्रॉल को कम किए बिना प्रमुख हृदय संबंधी घटनाओं को लगभग 15% तक कम किया, जिससे यह प्रत्यक्ष मानवीय प्रमाण मिला कि सूजन हृदयाघातों को एक स्वतंत्र मार्ग के माध्यम से प्रेरित करती है…) provided randomized evidence that targeting inflammation in the absence of any LDL-lowering effect can reduce cardiovascular events. Canakinumab — a monoclonal antibody against IL-1β — reduced the primary प्रमुख प्रतिकूल हृदय संबंधी घटनाएंएक प्रमुख प्रतिकूल हृदय संबंधी घटना, या MACE, किसी अध्ययन में एक साथ गिने जाने वाले बुरे परिणामों का एक समूह है - आमतौर पर हृदय संबंधी मृत्यु, दिल का दौरा और स्ट्रोक।. (MACE) endpoint by approximately 15 percent at the 150 mg dose without lowering LDL-C, with the greatest benefit in those with the largest reduction in आईएल-६इंटरल्यूकिन-6, या IL-6, एक सिग्नलिंग अणु है जिसका उपयोग प्रतिरक्षा प्रणाली शरीर में सूजन संबंधी संदेश फैलाने के लिए करती है।. [30]. The trial supports the conclusion that inflammatory signaling contributes to recurrent events through mechanisms not fully captured by LDL-C reduction alone, and it identifies the एनएलआरपी3 इन्फ्लामासोमएनएलआरपी3 इन्फ्लेमासोम प्रतिरक्षा कोशिकाओं में एक इंट्रासेल्युलर प्रोटीन कॉम्प्लेक्स है जो एथेरोस्क्लरोटिक प्लाक के भीतर कोलेस्ट्रॉल क्रिस्टल, ऑक्सीकृत लिपिड या अन्य खतरे के संकेतों द्वारा सक्रिय होने पर, भड़काऊ साइटोकाइंस इंटरलेकिन-1बी और इंटरलेकिन-6 की रिहाई को ट्रिगर करता है, जिससे प्लाक की वृद्धि और अस्थिरता तेज हो जाती है।. → IL-1β → IL-6 → CRP axis as a clinically tractable therapeutic target. Atherosclerosis is now best framed as a disease driven by parallel and partially independent processes — apoB-particle retention and innate immune activation — both of which can be addressed for optimal event reduction.
12.3 Clonal Hematopoiesis of Indeterminate Potential
Clonal hematopoiesis of indeterminate potential (CHIP) refers to the presence of acquired somatic mutations in hematopoietic stem cells — most commonly in DNMT3A, TET2, ASXL1, and JAK2 — without overt hematologic malignancy. CHIP is detectable in fewer than 1 percent of young adults but in approximately 10 percent of individuals over age 70. Jaiswal and colleagues demonstrated that CHIP carriers have approximately 2-fold increased risk of coronary heart disease and earlier MI (by 5–10 years) [31]. Mechanistically, mutant myeloid cells secrete excess IL-1β and IL-6, accelerating vascular inflammation; consistent with this, several studies have reported greater subclinical atherosclerotic burden or progression in CHIP carriers, although effect sizes vary by mutation, cohort, and imaging endpoint. CHIP represents a major emerging axis of cardiovascular risk that is not detected by traditional risk-factor measurement.
12.4 Neutrophil-to-Lymphocyte Ratio
The neutrophil-to-lymphocyte ratio (NLR), readily computable from any complete blood count, is an inexpensive marker of systemic inflammation. Reviews and meta-analyses associate higher NLR with increased cardiovascular risk and accelerated subclinical atherosclerosis, but cutoffs vary by population and clinical setting; the commonly cited NLR threshold of >3.0 is best presented as a research-context cutoff rather than as a guideline-endorsed diagnostic threshold [32].
13. Lipoprotein(a) as an Independent Causal Risk Factor
13.1 Genetic and Mendelian Evidence
Lipoprotein(a) [Lp(a)] is predominantly genetically determined by variation at the LPA locus on chromosome 6q26-q27. The कोपेनहेगन सामान्य जनसंख्या अध्ययनA very large Danish study that measured lipids, including Lp(a) and remnant cholesterol, in tens of thousands of people and followed their health for years. demonstrated a stepwise dose-response relationship between LPA kringle IV-2 copy-number variation and myocardial infarction risk; Mendelian-randomization studies have confirmed causality with effect sizes greater per unit than those of LDL-C [20], [21], [27].
13.2 Mechanisms of Pathogenicity
Lp(a) consists of an LDL-like particle (one apoB-100 molecule, cholesterol, phospholipids) covalently linked via a single disulfide bond between Cys4326 of apoB and Cys4057 of apolipoprotein(a) [apo(a)]. Apo(a) is structurally homologous to प्लास्मिनोजेनएक रक्त प्रोटीन जो थक्का-घुलने वाले एंजाइम प्लास्मिन में परिवर्तित हो जाता है; Lp(a) में apo(a) प्लास्मिनोजेन के साथ मजबूत संरचनात्मक समरूपता साझा करता है, जिससे Lp(a) थक्के के टूटने में प्रतिस्पर्धी रूप से हस्तक्षेप कर सकता है।., possessing 10 kringle IV repeats and a single kringle V domain, but lacks proteolytic activity. Multiple mechanisms of pathogenicity converge:
First, Lp(a) is the principal carrier of oxidized phospholipids on apoB lipoproteins; approximately 85 percent of plasma OxPL associated with apoB are bound to Lp(a). OxPL activate endothelial cells, monocytes, and प्लेटलेट्सप्लेटलेट्स रक्त में छोटे, केंद्रकहीन कोशिका टुकड़े हैं जिनकी प्राथमिक भूमिका संवहनी चोट के स्थानों पर एक साथ चिपक कर एक थक्का बनाना और रक्तस्राव को रोकना है; क्योंकि वे नए प्रोटीन का संश्लेषण नहीं कर सकते हैं, इसलिए एस्पिरिन द्वारा उनके थक्के बनाने वाले एंजाइम का अपरिवर्तनीय अवरोध प्लेटलेट के पूरे 7-10 दिनों के जीवनकाल तक रहता है।. [22]. Second, the kringle IV-10 lysine-binding site of apo(a) competes with plasminogen for fibrin, impairing फाइब्रिनोलिसिसवह शारीरिक प्रक्रिया जिसके द्वारा शरीर प्लास्मिन एंजाइम के माध्यम से रक्त के थक्कों को घोलता है; Lp(a) फ़ाइब्रिन-बाइंडिंग साइटों के लिए प्लास्मिनोजेन के साथ प्रतिस्पर्धा करके इस प्रक्रिया को बाधित करता है, जिससे थक्के का घुलना कम होता है और ऑक्लूसिव कार्डियक घटना का जोखिम बढ़ जाता है।. and rendering Lp(a) prothrombotic [23]. Third, Lp(a) induces IL-6, IL-8, and MCP-1 expression in vascular cells, contributing to the pro-inflammatory phenotype. Fourth, Lp(a) is associated with calcific महाधमनी कपाटमहाधमनी कपाट (ऑर्टिक वाल्व) हृदय के मुख्य पंपिंग कक्ष और महाधमनी के बीच का एकतरफा द्वार है।. stenosis, with Mendelian-randomization data establishing a causal link [24].
13.3 Prevalence and Clinical Implications
Approximately 20 percent of the global population has Lp(a) >50 mg/dL (>125 nmol/L), the threshold above which cardiovascular risk is materially elevated; approximately 1 in 5 individuals with premature MI have elevated Lp(a) [25], [26]. Distribution differs by ancestry: highest in West Africans, intermediate in Europeans, and lowest in East Asians.
Elevated Lp(a) should be treated as an independent causal risk factor that can coexist with absent, mild, or advanced coronary artery calcium. In MESA and the Dallas Heart Study, elevated Lp(a) and CAC were each independently associated with ASCVD risk, and participants with both elevated Lp(a) and CAC ≥100 had the highest observed risk [87]. Once-in-a-lifetime Lp(a) measurement is now supported by contemporary EAS/ESC guidance and by the 2024 National Lipid Association focused update on Lp(a) in clinical practice [25], [86]. Subclinical disease evaluation should include consideration of Lp(a)-driven phenotypes when CAC, plaque burden, aortic valve calcification, or events occur out of proportion to traditional risk factors. Emerging therapeutics — antisense oligonucleotides (पेलकार्सनपेलकार्सन एक आरएनए-लक्षित थेरेपी (एक एंटीसेंस ऑलिगोन्यूक्लियोटाइड) है जिसे यकृत में इसके उत्पादन को कम करके लिपोप्रोटीन (ए) को कम करने के लिए डिज़ाइन किया गया है; यह हर कुछ हफ़्ते में शिरा के माध्यम से या त्वचा के नीचे इंजेक्शन द्वारा दिया जाता है और वर्तमान में यह निर्धारित करने के लिए अंतिम चरण के परीक्षणों में है कि क्या Lp(a) की कमी से हृदय संबंधी घटनाओं में कमी आती है।.) and siRNA agents targeting LPA mRNA — can lower Lp(a) by 80–98 percent and are currently in phase 3 cardiovascular outcome trials.
14. Microvascular Contributions and Capillary Rarefaction
14.1 Capillary Density Loss in Hypertension
Capillary rarefactionकेशिका विरलता कंकाल की मांसपेशियों के भीतर केशिका घनत्व की उम्र से संबंधित हानि है, जो उस दूरी को बढ़ाती है जो ऑक्सीजन को रक्त से मांसपेशी तंतुओं तक तय करनी होती है और व्यायाम के दौरान ऑक्सीजन निष्कर्षण की दक्षता को कम करती है।. — a reduction in the number of perfused capillaries per unit tissue volume — is a hallmark of essential hypertension and precedes the development of fixed BP elevation. Antonios and colleagues demonstrated approximately 14 percent reduction in dorsal-finger केशिका घनत्वCapillary 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. in hypertensives versus normotensives [56]. Rarefaction increases peripheral vascular resistance and contributes to organ dysfunction across the kidneys, retina, and heart.
14.2 Coronary Microvascular Dysfunction
Coronary microvascular dysfunction (CMD) affects approximately half of women with chest pain and a quarter of men. Diagnosis is based on PET-derived coronary flow reserve <2.0 or invasively measured index of microcirculatory resistance (IMR) >25. The long-term prognosis is sobering: even in the absence of obstructive epicardial disease, CMD doubles the risk of MACE. The ISCHEMIA trialThe International Study of Comparative Health Effectiveness with Medical and Invasive Approaches randomized 5,179 patients with stable coronary artery disease and moderate-to-severe ischemia to an upfront invasive strategy or medical therapy alone, finding no significant difference in the primary composite cardiovascular endpoint. substudy and the WISE-CVD continuation studies have established CMD as a clinically important entity [37], [38].
14.3 Retinal Microvasculature as a Window
Retinal arteriolar narrowing — quantified by lower arteriole-to-venule ratio on fundoscopy or by optical coherence tomography angiography — predicts cardiovascular events independently of traditional risk factors. The retina is the only vascular bed directly visualizable in vivo and provides a non-invasive read-out of systemic microvascular health [57].
15. Mechanisms of Asymptomatic Progression: Glagov Remodeling and Vulnerable Plaque
15.1 Outward Remodeling and the Glagov Phenomenon
Glagov and colleagues, in 1987, demonstrated that human coronary arteries undergo a two-stage remodeling process in response to plaque accumulation. In the compensatory phase, while plaque area remains less than approximately 40 percent of the area bounded by the internal elastic lamina, the total vessel area increases such that the lumen area remains approximately constant or even slightly increases [77]. This बहिःमुखी पुनर्रूपणआउटवर्ड रीमॉडेलिंग (जिसे प्रतिपूरक या सकारात्मक रीमॉडेलिंग भी कहा जाता है) वह प्रक्रिया है जिसके द्वारा एक धमनी बढ़ती हुई पट्टिका को समायोजित करने के लिए अपने बाहरी व्यास का विस्तार करती है, धमनी की दीवार के रोगग्रस्त होने के बावजूद आंतरिक लुमेन को सुरक्षित रखती है; इस वजह से, मानक परीक्षण जो केवल लुमेन के खुलने को मापते हैं, वे महत्वपूर्ण एथेरोस्क्लेरोसिस से चूक सकते हैं।. allows substantial plaque burden to coexist with no restriction of resting blood flow — and thus no symptoms and no abnormality on standard luminography. Only in the encroachment phase, when plaque area exceeds ≈40 percent of the IEL area, does the vessel become unable to expand further, and the lumen begins to narrow rapidly. This biology explains why coronary angiography systematically underestimates plaque burden and why a single negative coronary angiogram does not exclude clinically meaningful subclinical disease.
15.2 Flow Reserve and Collateralization
The cardiovascular system possesses substantial functional reserve. In the coronary and renal beds, resting blood flow is typically maintained until stenosis exceeds 60–70 percent of luminal diameter; in skeletal-muscle beds, flow reserves are even higher. Slow progression of subclinical disease often allows the development of collateral circulationCollateral circulation is a network of small backup blood vessels that can grow around a blocked artery, like a detour around a closed road. — alternative vascular pathways that bypass obstructive lesions — further masking the primary disease and contributing to the asymptomatic course.
15.3 The Vulnerable Plaque Concept
Not all plaques are equally dangerous. The Virmani–Stary classification defined the “थिन-कैप फ़ाइब्रोएथेरोमाA thin-cap fibroatheroma is an advanced atherosclerotic lesion in which inflammatory proteolysis has reduced the fibrous cap thickness to below 65 micrometers over a necrotic core, making it the plaque phenotype most associated with rupture and acute coronary thrombosis.” (TCFA) as a plaque with a fibrous cap thinner than 65 μm overlying a large लिपिड-समृद्ध नेक्रोटिक कोरलिपिड से भरपूर नेक्रोटिक कोर एक उन्नत एथेरोस्क्लेरोटिक प्लाक का नरम, वसा और भड़काऊ-कोशिकाओं से भरा हुआ आंतरिक भाग है; यह सबसे अधिक फटने की आशंका वाला डिब्बा है और लिपिड कम करने के प्रति सबसे अधिक संवेदनशील है, जो इसे सिकोड़ सकता है और स्थिर कर सकता है, भले ही आसपास के कैल्सीकृत ऊतक बने रहें।. (>10 percent of तख्ती की मात्राप्लाक वॉल्यूम धमनी के एक हिस्से में प्लाक की कुल भौतिक मात्रा है, जिसे क्यूबिक मिलीमीटर में मापा जाता है।.), with macrophage infiltration of the cap, intraplaque hemorrhage, and positive (outward) remodeling [81], [82]. The PROSPECT trial used three-vessel intravascular ultrasound with virtual histology to characterize 697 patients with acute coronary syndromes and showed that अपराधी घावThe 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. of subsequent events were predominantly TCFAs with plaque burden ≥70 percent and minimum lumen area ≤4.0 mm² [72].
| विशेषता | Threshold | Hazard ratioएक हैज़र्ड रेशो (संभाव्यता अनुपात) इस बात की तुलना करता है कि दो समूहों में घटनाएँ कितनी तेज़ी से घटती हैं। 0.75 के अनुपात का मतलब है कि उपचारित समूह में घटनाएँ तीन-चौथाई दर पर हुईं।. for MACE |
| Fibrous cap thickness | <65 μm (TCFA) | ≈5–7× |
| Necrotic core volume | >10% of plaque volume | ≈2–3× |
| Plaque burden | ≥70% cross-section | ≈5× (PROSPECT) |
| Minimum lumen area (IVUS) | ≤4.0 mm² | ≈3× |
| Positive remodelingधमनी की दीवार का बाहरी विस्तार जो आंतरिक लुमेन व्यास को बनाए रखते हुए बढ़ते एथेरोस्क्लेरोटिक प्लाक को समायोजित करता है; धमनी उन परीक्षणों पर अबाधित दिखाई देती है जो केवल लुमेन संकीर्णन का आकलन करते हैं, और इस प्रकार संरचना रूप से संवेदनशील प्लाक को छुपा देते हैं।. index | ≥1.10 | ≈2.5× |
| Low-attenuation plaqueLow-attenuation plaque is the very darkest, fattiest plaque on a CT scan — soft enough that X-rays pass through it easily. (CCTA) | <30 HU | ≈2.5–3× |
| Napkin-ring signThe napkin-ring sign is a distinctive pattern on a CT scan: a dark, fatty plaque core surrounded by a bright rim, so the cross-section resembles a ring. (CCTA) | Qualitative | ≈5× |
सारणी 4. Vulnerable-plaque features and approximate hazard ratios for major adverse cardiovascular events. Ranges synthesized from PROSPECT, ICONIC, SCOT-HEART, and CRISP-CT data [63], [64], [65], [67], [72].
16. Pulse Wave Velocity, Arterial Stiffness, and Vascular Calcification
16.1 Two Distinct Calcification Phenotypes
Vascular calcification is not monolithic. Two distinct phenotypes coexist with different mechanisms, prognoses, and therapeutic implications. Intimal calcification occurs within lipid-rich atherosclerotic plaques and is the substrate quantified by the Agatston-method कोरोनरी धमनी कैल्शियम स्कोरA 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.; it is apoB-driven and predicts events. Medial calcification, classically described by Mönckeberg, occurs within the tunica media independently of lipids and is driven by osteogenic transdifferentiation of vascular smooth-muscle cells; it is most prominent in क्रोनिक किडनी डिजीजक्रोनिक किडनी डिजीज गुर्दों की खून से अपशिष्ट पदार्थों को फ़िल्टर करने की क्षमता में एक स्थायी कमी है।., प्रकार 2 मधुमेहमधुमेह एक ऐसी स्थिति है जिसमें रक्त शर्करा बहुत अधिक बनी रहती है, या तो इसलिए कि शरीर बहुत कम इंसुलिन बनाता है या इसलिए कि यह अपने द्वारा बनाए जाने वाले इंसुलिन का जवाब देना बंद कर देता है।., and aging [58].
16.2 Elastin Fragmentation
Aortic इलास्टिनइलास्टिन धमनी की दीवार में एक संरचनात्मक प्रोटीन है जो रक्त वाहिकाओं को प्रत्येक दिल की धड़कन के साथ फैलने और वापस सिकुड़ने की अनुमति देता है; उम्र के साथ यह क्षय हो जाता है और इसकी जगह सख्त कोलेजन ले लेता है, जिससे धमनियों का सख्त होना और सिस्टोलिक रक्तचाप का बढ़ना होता है।. has a half-life of approximately 70 years and is essentially non-renewable in the adult vasculature. Cyclic mechanical stress, MMP-2/MMP-9 activity, and elastolytic enzymes such as cathepsins S and K cause elastin fragmentation that directly increases pulse wave velocity. Loss of elastin recoil shifts mechanical load to collagen — a fiber 100 to 1000 times stiffer than elastin — producing the progressive aortic stiffening characteristic of संवहनी बुढ़ापाThe progressive structural and functional deterioration of arteries over time, characterized by loss of elasticity, increased stiffness, and accumulation of microscopic damage that makes arterial walls more susceptible to lipid deposition and chronic inflammation..
16.3 Calcium-Phosphate Crystallization
In CKD, hyperphosphatemia drives VSMC apoptosis and matrix-vesicle release, which nucleate hydroxyapatite crystals. Pyrophosphate, fetuin-A, and matrix Gla protein are physiological inhibitors that decline with age and CKD. Klotho — a transmembrane and circulating protein expressed in kidney that serves as co-receptor for FGF23 — declines with age, and klotho deficiency directly accelerates vascular calcification. FGF23 itself is independently associated with बाएँ वेंट्रिकल का हाइपरट्रॉफीबाएँ निलय की पेशीय दीवार का रोग संबंधी मोटा होना, जो आमतौर पर लगातार उच्च रक्तचाप के कारण होता है जिससे हृदय को अधिक मेहनत करनी पड़ती है; रक्तचाप सामान्य होने के बाद भी, संरचनात्मक अतिवृद्धि कुछ हद तक बनी रह सकती है।., vascular calcification, and cardiovascular mortality [58], [59].
16.4 Pulse Wave Velocity Cutoffs
Pulse wave velocity, the gold-standard non-invasive measure of arterial stiffness, has well-established prognostic thresholds. Carotid–femoral PWV (cfPWV) is the gold standard; the European Society of Hypertension/European Society of Cardiology consensus document established >10 m/s as the threshold for elevated cardiovascular risk after correction for the actual travel path of the pulse wave [60]. Brachial–ankle PWV (baPWV), used predominantly in East Asian populations, has a commonly applied threshold of >14 m/s for elevated risk and >18 m/s for severe arterial stiffening [61].
16.5 Augmentation Index and CAVI
Augmentation index (AIx@75), derived from pulse wave analysis, reflects wave reflection from the periphery and is elevated in arterial stiffening; thresholds >25 percent are associated with elevated risk [60]. The cardio-ankle vascular index (CAVI) is a BP-independent measure of arterial stiffness, with values >9 indicating elevated risk [62].
17. Detection Modalities for Subclinical Vascular Disease
17.1 Coronary Artery Calcium Scoring
Non-contrast CT scanning of the heart with computation of the अगाटस्टन स्कोरThe Agatston score is the specific formula used to turn a calcium CT scan into a single number, weighting each calcium deposit by how dense and how large it is. remains the most widely validated single test for subclinical coronary disease. CAC of zero in asymptomatic adults confers a very low 10-year MACE risk, and CAC is incorporated as a risk-decision tool in the 2018 AHA/ACC cholesterol guidelines and the 2019 ESC/EAS डिस्लिपिडिमियाडyslipidemia रक्त में वसा के एक अस्वस्थ पैटर्न के लिए चिकित्सीय शब्द है। इसका मतलब उच्च एलडीएल (LDL), उच्च ट्राइग्लिसराइड्स, कम एचडीएल (HDL), या इनका कोई संयोजन हो सकता है।. guidelines. The radiation dose is approximately 1 mSv, comparable to natural background exposure for several months.
17.2 Coronary CT Angiography and High-Risk Plaque Features
कोरोनरी सीटी एंजियोग्राफीकोरोनरी सीटी एंजियोग्राफी, या सीसीटीए, आपकी नसों में डाई के साथ किया जाने वाला एक सीटी स्कैन है जो आपके हृदय की धमनियों की विस्तृत तस्वीरें तैयार करता है।. (CCTA) provides whole-vessel morphology and the ability to identify high-risk plaque features that are not captured by Agatston scoring alone. These features include low-attenuation plaque (<30 HU within plaque, indicating lipid-rich necrotic core; HR for MACE ≈2.5–3.0); positive remodeling (remodeling index ≥1.10); spotty calcification; and the napkin-ring sign (central low attenuation surrounded by a rim of higher attenuation; HR ≈5) [63], [64].
The five-year SCOT-HEART analysis demonstrated that CCTA-guided management reduced fatal and non-fatal MI by 41 percent compared with standard care in symptomatic patients [65]. The PROMISE and CONFIRM2 registries have provided further prognostic validation.
17.3 Pericoronary Fat Attenuation Index
Pericoronary fat attenuation index (FAI), introduced by Antonopoulos and colleagues, quantifies CT attenuation of pericoronary adipose tissue within a defined radial zone. Inflamed coronary segments shift the local adipose attenuation toward less negative HU values (less lipid, more aqueous), reflecting paracrine inflammatory signaling between coronary plaque and surrounding fat [66]. The CRISP-CT study demonstrated that elevated perivascular FAI predicts cardiac mortality independently of plaque burden, with the strongest signal observed for high FAI around the proximal right coronary artery [67]. FAI-derived metrics are now incorporated into commercial post-processing platforms; U.S. FDA clearance has been reported for some products in this family (e.g., CaRi-Plaque), while CaRi-Heart/FAI-Score has regulatory clearance in selected non-U.S. markets and remains in evolving regulatory status in the United States, so specific labeling claims should be verified by product and date.
17.4 AI-Quantitative CCTA
AI-enhanced and deep-learning quantitative coronary CT angiography (AI-QCT) — exemplified by the Cleerly and HeartFlow Plaque Analysis platforms — automates segmentation of total plaque volume; calcified, non-calcified, and low-attenuation components; remodeling indices; and pericoronary fat attenuation. A 2022 international multicenter study by Lin and colleagues validated a deep-learning CCTA pipeline against expert readers and demonstrated favorable reproducibility and prognostic performance for plaque, stenosis, and जोखिम पूर्वानुमानRisk prediction in cardiovascular medicine refers to the use of clinical variables — such as age, blood pressure, cholesterol, and smoking status — or direct measurements such as imaging to estimate an individual's probability of suffering a heart attack or stroke within a defined time horizon. [88]. AI-QCT methods are increasingly used clinically, but specific platform claims should be matched to platform-specific validation data.
17.5 Vessel Wall MRI
High-resolution 3-Tesla vessel-wall MRI with black-blood sequences (DANTE-prepared T1, SPACE, MERGE) directly images the arterial wall, allowing differentiation of intracranial atherosclerosis (eccentric, peripheral enhancement) from vasculitis (concentric enhancement) and dissection (intramural hematoma). VW-MRI detects plaque before luminal narrowing and is particularly valuable in evaluating intracranial atherosclerotic disease [69].
17.6 Optical Coherence Tomography
Intravascular optical coherence tomography (OCT) provides 10-μm-resolution cross-sectional imaging of coronary plaques, capable of measuring fibrous cap thickness directly and identifying microcalcificationsएथरोस्क्लेरोटिक प्लाक के भीतर सूक्ष्म कैल्शियम जमा जो पारंपरिक सीटी के रिज़ॉल्यूशन थ्रेशोल्ड से कम होते हैं; घने मैक्रोकेल्सीफ़िकेशन के विपरीत, सूक्ष्म कैल्सीफ़िकेशन रेशेदार कैप के भीतर यांत्रिक तनाव उत्पन्न कर सकते हैं और प्लाक के फटने की संवेदनशीलता को बढ़ा सकते हैं।., plaque erosion, and intracoronary thrombus. OCT is the imaging modality of choice when characterizing plaque morphology in MINOCA and SCAD.
17.7 Ultrasound Microvascular Imaging
Contrast-enhanced ultrasound and super-resolution ultrasound localization microscopy (ULM) image vasa vasorum neovascularizationNeovascularization is the growth of new blood vessels. Inside a plaque, they sprout from the vessels feeding the artery's own wall. within carotid plaques and detect microvascular rarefaction at micron-scale resolution, providing a functional read-out of plaque inflammation and tissue microcirculation [70].
17.8 Carotid Intima-Media Thickness, Ankle-Brachial Index, and Renal Doppler
Carotid intima-media thickness >0.9 mm (and focal IMT >1.5 mm defining plaque) on high-resolution B-mode ultrasound predicts cardiovascular events and is widely used in pediatric and FH research. Ankle-brachial index <0.9 indicates significant peripheral arterial disease and confers elevated cardiovascular risk irrespective of symptoms. Renal Doppler with peak systolic velocity >180–200 cm/s at the renal ostium and renal-aortic ratio >3.5 is the screening test of choice for renal artery stenosis.
| Vascular bed | Preferred modality | Key parameter / threshold |
| कोरोनरी | Non-contrast CT (Agatston) | CAC score >0 indicates subclinical disease |
| कोरोनरी | CCTA | LAP, NRS, PR; FAI; AI-QCT plaque volumes |
| Carotid | Ultrasound | CIMT >0.9 mm; plaque defined as focal IMT >1.5 mm |
| Lower limb | Ankle-brachial index | ABI <0.9 indicates significant PAD |
| Brain (large) | Vessel-wall MRI | Eccentric wall thickening; contrast enhancement |
| Systemic | पल्स वेव वेग | cfPWV >10 m/s; baPWV >14 m/s |
| Renal | Duplex ultrasound / MRA | PSV >180–200 cm/s; renoaortic ratio >3.5 |
| Endothelial | Brachial FMD; EndoPAT RHI | FMD <7%; RHI <1.67 |
Table 5. Preferred imaging and physiological modalities for detection of subclinical vascular disease across the arterial tree. CAC, coronary artery calcium; CCTA, coronary CT angiography; LAP, low-attenuation plaque; NRS, napkin-ring sign; PR, positive remodeling; FAI, pericoronary fat attenuation index; AI-QCT, AI-quantitative coronary CT; CIMT, carotid intima-media thickness; PWV, pulse wave velocity; FMD, flow-mediated dilation; RHI, reactive hyperemia index.
18. Genetic Factors and Polygenic Risk
18.1 The 9p21 Locus
The chromosome 9p21.3 locus was identified by genome-wide association in 2007 as the first robustly replicated CHD susceptibility region. Each risk allele confers approximately 25 percent increased CHD risk, independent of all known traditional risk factors. The locus contains the long non-coding RNA ANRIL and lies adjacent to the CDKN2A/CDKN2B tumor-suppressor genes; the proposed mechanism involves dysregulation of vascular smooth-muscle proliferation and senescence [75].
18.2 LDLR, APOB, and PCSK9 Variants
Familial hypercholesterolemia is caused by pathogenic variants in LDLR (>2,000 mutations described), APOB (R3500Q the canonical variant of familial defective apoB), or, rarely, gain-of-function variants in PCSK9. The prevalence of heterozygous FH is approximately 1 in 250 in most populations; homozygous FH is roughly 1 in 300,000. Loss-of-function variants in PCSK9 (R46L, Y142X, C679X) reduce LDL across the life course and confer 30–88 percent reductions in CHD [12].
18.3 Polygenic Risk Scores
Khera and colleagues constructed a polygenic risk scoreपॉलीजेनिक रिस्क स्कोर किसी बीमारी के आपके आनुवंशिक जोखिम का अनुमान लगाने के लिए कई छोटे आनुवंशिक रूपों के प्रभावों को जोड़ता है।. comprising 6.6 million variants and demonstrated that the top 8 percent of the population have a 3-fold increased CHD risk — an effect equivalent in magnitude to monogenic FH. Polygenic scores add incremental prognostic information beyond traditional risk factors and Mendelian variants and are increasingly being incorporated into multi-layered risk-stratification models [76].
19. Lifestyle Reversibility and Plaque Regression: The Trial Evidence
A central question for the practicing clinician is whether subclinical atherosclerosis can be reversed once established. The available imaging-based randomized and case-series evidence supports the conclusion that, with sufficient reduction in apoB-particle exposure and inflammation, both functional and structural plaque regression is achievable.
19.1 The Lifestyle Heart Trial (Ornish)
The Lifestyle Heart Trial randomized 48 patients with angiographically documented CAD to a comprehensive lifestyle intervention or usual care. The intervention combined a whole-food plant-based (WFPB) diet (≈10 percent of calories from fat), एरोबिक व्यायामएरोबिक व्यायाम एक निरंतर गतिविधि है जो कुछ समय के लिए आपकी साँसों को तेज़ कर देती है, जैसे तेज़ चलना, साइकिल चलाना, तैरना या जॉगिंग करना।., stress management with yoga and meditation, group support, and smoking cessation. मात्रात्मक कोरोनरी एंजियोोग्राफीमात्रात्मक कोरोनरी एंजियोग्राफी, केवल देखकर अंदाज़ा लगाने के बजाय, एंजियोग्राम छवियों से धमनी के संकीर्णन को सटीक रूप से मापने का एक तरीका है।. at 1 year showed mean percent व्यास स्टेनोसिसDiameter 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. decreased from 40.0 percent to 37.8 percent in the experimental group versus an increase from 42.7 percent to 46.1 percent in controls (between-group p<0.001) [43]. At 5-year follow-up, the experimental group showed continued regression to 37.3 percent versus control progression to 51.9 percent, with approximately 2.5-fold fewer हृदय संबंधी घटनाएंहृदय संबंधी नैदानिक रूप से महत्वपूर्ण घटनाएं—जिनमें मायोकार्डियल इंफार्क्शन, अस्थिर एनजाइना और हृदय संबंधी मृत्यु शामिल हैं—कार्डियोवैस्कुलर परीक्षणों में परिणाम समापन बिंदुओं के रूप में उपयोग की जाती हैं।. in the intervention group [44]. The Lifestyle Heart Trial is among the best-known randomized lifestyle interventions to demonstrate एंजियोग्राफिक प्रतिगमनएंजियोग्राफिक रिग्रेशन से तात्पर्य एक्स-रे इमेजिंग पर दिखने वाले कोरोनरी धमनी अवरोध के मापनीय आकार में कमी से है; लेख में लाइफस्टाइल हार्ट ट्रायल का हवाला दिया गया है जो यह प्रदर्शित करता है कि गहन पौधे-आधारित आहार और जीवनशैली में बदलाव इस प्रभाव को उत्पन्न कर सकते हैं।. of coronary atherosclerosis.
19.2 The Esselstyn Case Series
Esselstyn and colleagues prospectively followed 198 consecutive self-selected patients with established CAD who adopted an oil-free WFPB diet. Of these, 177 (89.4 percent) were adherent over a mean 3.7 years of follow-up. Adherent patients experienced a 0.6 percent recurrent event rate, while non-adherent patients experienced a 62 percent event rate, and several patients showed angiographically documented coronary regression. The principal limitations are well recognized: the absence of a concurrent control group, self-selected participants, adherence-related selection effects, and reliance on chart-based outcome ascertainment. The findings are best presented as supportive and hypothesis-generating, consistent with the intensive lifestyle-trial evidence above, rather than as proof that WFPB intervention is uniquely effective [45].
19.3 STARS and the Heidelberg Trial
The St Thomas’ Atherosclerosis Regression Study (STARS) randomized 90 men with CAD to usual care, a lipid-lowering diet, or diet plus cholestyramine. Quantitative angiography at 39 months showed regression in 38 percent of the diet group, 33 percent of the diet + drug group, and only 4 percent of usual-care patients, with progression in 15 percent, 12 percent, and 46 percent respectively [46]. The Heidelberg Trial (Schuler and colleagues) demonstrated, with a multifactorial intervention combining a low-fat diet and structured exercise, reduced angiographic progression and modest regression at 1 year [47].
19.4 IVUS-Documented Statin and PCSK9-Inhibitor Regression Trials
Beginning with REVERSAL in 2004, intravascular ultrasound has provided high-resolution quantification of changes in एथेरोमा आयतन प्रतिशतप्रतिशत एथेरोमा वॉल्यूम, या PAV, खुले चैनल के बजाय पट्टिका द्वारा ली गई धमनी खंड का हिस्सा है।. (PAV) और कुल एथेरोमा आयतनकुल एथेरोमा वॉल्यूम (Total atheroma volume) IVUS से प्राप्त एक निश्चित माप है जो इमेज़्ड कोरोनरी खंड के भीतर प्लाक के कुल त्रि-आयामी आयतन को घन मिलीमीटर में व्यक्त करता है। PAV के विपरीत, TAV को वाहिका के आकार के अनुसार सामान्यीकृत नहीं किया जाता है, इसलिए यह समय के साथ कम या ज्यादा हुई बीमारी की वास्तविक मात्रा को दर्शाता है।. in response to lipid-lowering therapy. The cumulative dataset establishes a clear dose–response: progressively lower on-treatment LDL produces progressively greater plaque regression.
| Trial | वर्ष | थैरेपी | LDL achieved | परिणाम |
| Lifestyle Heart | 1990, 1998 | WFPB + multimodal lifestyle | ≈95 mg/dL | Stenosis −7.9% (relative); ~2.5× fewer events |
| Esselstyn series | 1999, 2014 | Oil-free WFPB diet | Variable; intensive LDL lowering | 0.6% recurrent events in adherents over mean 3.7 yr; uncontrolled, self-selected |
| STARS | 1992 | Diet ± cholestyramine | ≈125 mg/dL | 38% regression vs. 4% usual care |
| REVERSAL | 2004 | एटोरवास्टेटिनएटोवास्टेटिन, जिसे लिपिटर के रूप में बेचा जाता है, दो सबसे मजबूत स्टेटिन में से एक है और दुनिया में सबसे अधिक लिखी जाने वाली दवाओं में से एक है।. 80 mg | 79 mg/dL | PAV stable (Δ −0.4%) |
| क्षुद्रग्रह | 2006 | रोसुवास्टेटिनरोसुवास्टेटिन, जिसे क्रेस्टोर के रूप में बेचा जाता है, सबसे शक्तिशाली स्टेटिन उपलब्ध है और शरीर में फैलने के बजाय मुख्य रूप से यकृत में रहता है।. 40 mg | 60.8 mg/dL | PAV −0.98%, TAV −6.8% |
| शनि | 2011 | Rosuva 40 vs. atorva 80 | 62 / 70 mg/dL | PAV −1.22% / −0.99% |
| GLAGOV | 2016 | Evolocumab + statin | 36.6 mg/dL | PAV −0.95% vs. +0.05% |
| पैकमान-एमी | 2022 | एलिएरोकुमैबएलिडोकुमैब, जिसे प्रालुएंट के रूप में बेचा जाता है, एक इंजेक्टेबल एंटीबॉडी है जो PCSK9 को रोकता है, और इसे हर दो से चार सप्ताह में दिया जाता है।. + statin | 23.5 mg/dL | PAV −2.13%; ↑ fibrous cap thickness |
| हाइगेंस | 2022 | Evolocumab + statin | 28.1 mg/dL | Fibrous cap thickness +42.7 μm |
Table 6. Imaging-verified plaque regression trials, organized by intervention intensity and on-treatment LDL-C. PAV, percent एथेरोमाएथरोमा धमनी की दीवार के अंदर वसायुक्त जमाव के लिए दूसरा शब्द है — मूल रूप से यह प्लाक का पर्याय है, जिसका उपयोग शोध लेखन में अधिक किया जाता है।. volume; TAV, total atheroma volume; WFPB, whole-food plant-based [14], [15], [16], [17], [43], [44], [45], [46], [48], [49].
REVERSAL demonstrated essentially halted progression at LDL ≈79 mg/dL with high-dose statin therapy [14]. ASTEROID was the first trial to demonstrate clear regression — PAV reduced by 0.98 percent and TAV reduced by 6.8 percent — at on-treatment LDL of 60.8 mg/dL with rosuvastatin 40 mg [15]. SATURN extended the comparison to include atorvastatin 80 mg [16]. GLAGOV randomized 968 patients on optimized statin therapy to evolocumab or प्लैसबोplacebo एक डमी उपचार है — एक शुगर की गोली या सेलाइन इंजेक्शन — जो इसलिए दिया जाता है ताकि शोधकर्ता यह जान सकें कि वास्तव में एक असली दवा क्या असर करती है।. and demonstrated PAV regression of 0.95 percent in the evolocumab arm at on-treatment LDL of 36.6 mg/dL [17]. PACMAN-AMI, in patients post-acute MI, demonstrated PAV reduction of 2.13 percent and concurrent stabilization of plaque morphology — increased fibrous cap thickness, decreased lipid pool — at on-treatment LDL of 23.5 mg/dL with alirocumab on top of उच्च-तीव्रता वाली स्टैटिनएक हाई-इन्टेंसिटी स्टैटिन वह खुराक है जिससे एलडीएल को 50 प्रतिशत या उससे अधिक कम करने की उम्मीद की जाती है — व्यवहार में, ए atorvastatin या रोसुवास्टैटिन की उच्च खुराक।. [48]. HUYGENS, using OCT to measure fibrous-cap thickness directly, demonstrated an increase of 42.7 μm at on-treatment LDL of 28.1 mg/dL — converting many plaques from the TCFA to the thick-cap फाइब्रोएथेरोमाA 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. classification [49].
The combined message of these trials is that plaque regression and stabilization have been repeatedly observed with intensive LDL-C lowering, especially when achieved LDL-C is well below 70 mg/dL; the magnitude of regression varies by baseline plaque burden, imaging modality, achieved apoB/LDL-C, and background therapy.
19.5 The Subclinical Phase as the Optimal Intervention Window
Once a संवेदनशील पट्टिकाएक कमज़ोर पट्टिका वह होती है जिसमें फटने का खतरा अधिक होता है: एक पतली परत, एक बड़ा वसायुक्त कोर, सक्रिय सूजन, और अक्सर धमनी का बाहर की ओर उभार।. has formed — with its necrotic core, thin fibrous cap, and positive remodeling — even aggressive therapy can reduce and stabilize risk but does not eliminate all residual events, even at very low achieved LDL-C [18]. Conversely, आदिम रोकथामआदिम रोकथाम (प्रिमोर्डियल प्रिवेंशन) एक ऐसी रणनीति है जिसका उद्देश्य जोखिम कारकों या मौजूदा बीमारी का इलाज करने के बजाय, जन्म या शुरुआती जीवन से ही एथरोएजेनिक संपर्कों को लगभग शून्य पर रखकर, शुरुआत में ही हृदय संबंधी जोखिम कारकों के विकास को रोकना है। यह प्राथमिक रोकथाम से अलग है, जो उन लोगों को लक्षित करती है जिनमें जोखिम कारक तो पहले से मौजूद हैं लेकिन कोई नैदानिक बीमारी नहीं है।. — preventing the first transcytosis–retention event by maintaining low apoB exposure across the life course — more closely approximates the large lifetime benefit observed in genetically lower-LDL states. The operational implication is direct: start early, lower sufficiently, and sustain risk-factor control indefinitely.
19.6 The CAC Paradox
Statin therapy has been observed to increase the volume of coronary calcium even while reducing event rates. This does not necessarily indicate harmful progression: statins can increase plaque calcium density (a marker associated with healing and stabilization) while reducing the lipid-rich, vulnerable component of plaque. Because the Agatston score weights calcium density (assigning higher scores to denser calcium), a stabilizing lesion may yield a higher Agatston score even as event risk falls. The CAC density and volume score, developed by Criqui and colleagues, addresses this paradox by demonstrating that, at any given total Agatston score, higher CAC density predicts fewer events [50], [51]. The clinical implication is that serial CAC scoring during statin therapy must be interpreted with reference to density and morphology, not the Agatston number alone.
20. Synthesis and Implications for Practice
Subclinical atherosclerosis is not a passive state of aging but an active, progressive biological syndrome with measurable consequences in early adulthood — and, increasingly, in childhood and even in utero. The body of evidence reviewed here supports several integrated conclusions.
First, atherogenesis is causally driven by apoB-containing lipoproteins. The convergence of Mendelian-randomization, familial-genetic, and randomized-trial evidence across approximately twenty independent lines of investigation establishes apoB causality with rigor unmatched in most areas of medicine. Risk is proportional to the integral of apoB-particle exposure over time. The corollary is that primordial prevention — maintaining low apoB across the life course — yields the largest possible event reduction.
Second, parallel non-lipid pathways amplify or modulate apoB-driven atherogenesis. Lp(a), inflammation (NLRP3एनएलआरपी3 प्रतिरक्षा कोशिकाओं के अंदर एक अलार्म प्रणाली है। जब यह किसी ऐसी चीज़ का पता लगाता है जिसे वह खतरे के रूप में मानता है, तो यह भड़काऊ सिग्नलिंग का एक विस्फोट शुरू करता है।. → IL-1β → IL-6 → CRP), clonal hematopoiesis, hypertension, glycemic dysregulation, and arterial stiffening each contribute mechanistically distinct components of risk. Comprehensive prevention addresses all of these axes, not LDL alone.
Third, the divergence between large-artery atherosclerosis and cerebral small vessel disease reflects a fundamental structural and hemodynamic threshold. Vessel-wall complexity and the presence of vasa vasorum permit lipid-core plaque formation; the simpler architecture of penetrating arterioles favors lipohyalinosis, microatheroma, and amyloid angiopathy instead. Each pathology has its own risk-factor profile and optimal therapeutic approach.
Fourth, the “clinical silence” of subclinical disease is maintained by adaptive remodeling — the ग्लागोव परिघटनाग्लागोव परिघटना (जिसे प्रतिकारी या बाहरी रीमॉडेलिंग भी कहा जाता है) एथेरोस्क्लरोटिक प्लाक के संचय के रूप में धमनी की दीवार के बाहर की ओर फैलने की प्रवृत्ति है, जिससे प्लाक का भार बहुत बड़ा होने तक आंतरिक लुमेन व्यास सुरक्षित रहता है। चूँकि इस प्रतिकारी चरण के दौरान लुमेन का आकार सामान्य रहता है, इसलिए पर्याप्त... — and by physiological reserve in flow capacity. This silence is regularly punctured by subtle functional decays in cognitive processing speed, sleep regularity, exercise tolerance, and erectile function. These functional signals, properly recognized, provide a clinically actionable window for intervention years before the first overt event.
Fifth, sex-specific phenotypes — INOCA, MINOCA, SCAD, preeclampsia legacy effects, menopause-accelerated CIMT progression — have historically been under-diagnosed and require dedicated clinical pathways.
Sixth, the trial evidence — from the Lifestyle Heart Trial through the modern IVUS regression trials with PCSK9 अवरोधकपीसीएसके9 अवरोधक (PCSK9 inhibitor) एक ऐसी दवा है जो उस कोलेस्ट्रॉल-नष्ट करने वाले प्रोटीन को रोकती है, जिससे रक्त से कणों को साफ़ करने के लिए अधिक डॉकिंग पोर्ट उपलब्ध रह जाते हैं।. — supports the conclusion that subclinical atherosclerosis is, when addressed early and aggressively, partially reversible. Plaque can be stabilized, fibrous caps thickened, and event rates reduced. Whole-food plant-based dietary patterns and pharmacologic LDL-lowering both produce regression in their respective trial contexts; comprehensive lifestyle intervention complements rather than replaces appropriate pharmacologic therapy.
The life-course perspective provided by Napoli/FELIC, Bogalusa, PDAY, CARDIA, MESA, and the Tsimane natural experiment carries one practical message: the vascular integrity of late life is built on the risk exposures of youth. Early detection through CAC scoring, pulse wave velocity, vessel-wall MRI, FAI, and emerging AI-augmented imaging, combined with aggressive risk-factor management addressing apoB, Lp(a), inflammation, blood pressure, glycemia, sleep, fitness, and tobacco exposure, offers the realistic possibility of compressing cardiovascular morbidity to the very end of life. The goal of preventive cardiology is no longer the deferral of the first event by a decade; it is the elimination of clinical atherosclerotic disease as a routine cause of human suffering.
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