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Prospective application of pre-defined intravascular ultrasound criteria for assessment of intermediate left main coronary artery lesions results from the multicenter LITRO study Clinical impact of intravascular ultrasound guidance in drug-eluting stent implantation for unprotected left main coronary disease: pooled analysis at the patient-level of 4 registries Intravascular ultrasound findings of early stent thrombosis after primary percutaneous intervention in acute myocardial infarction: a Harmonizing Outcomes with Revascularization and Stents in Acute Myocardial Infarction (HORIZONS-AMI) substudy Imaging- and physiology-guided percutaneous coronary intervention without contrast administration in advanced renal failure: a feasibility, safety, and outcome study Coronary artery imaging with intravascular high-frequency ultrasound Mechanisms of in-stent restenosis after drug-eluting stent implantation: intravascular ultrasound analysis Comparison of one-year clinical outcomes between intravascular ultrasound-guided versus angiography-guided implantation of drug-eluting stents for left main lesions: a single-center analysis of a 1,016-patient cohort Stent underexpansion and residual reference segment stenosis are related to stent thrombosis after sirolimus-eluting stent implantation: an intravascular ultrasound study Intravascular Ultrasound Guidance Reduces Cardiac Death and Coronary Revascularization in Patients Undergoing Drug-Eluting Stent Implantation: Results From a Meta-Analysis of 9 Randomized Trials and 4724 Patients The Role of Vascular Imaging in Guiding Routine Percutaneous Coronary Interventions: A Meta-Analysis of Bare Metal Stent and Drug-Eluting Stent Trials
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EditorialOctober 2017, Volume 10, Issue 10

JOURNAL：Circ Cardiovasc Imaging. Article Link

High-Risk Coronary Atherosclerosis: Is It the Plaque Burden, the Calcium, the Lipid, or Something Else?

Akiko Maehara, Gregg W. Stone

ABSTRACT

Cardiac death and myocardial infarction usually result from thrombotic occlusion of a coronary artery with underlying atherosclerotic plaque. Histologically, most underlying plaques that have resulted in sudden cardiac death or myocardial infarction because of coronary thrombosis (vulnerable plaque) are ruptured thin-cap fibroatheromas with large plaque burden and a lipid-rich necrotic core. Second most common are erosions of proteoglycan-rich plaques with thrombosis, despite an intact fibrous cap. The extent that macroscopic or microscopic calcification contributes to plaque instability and thrombosis is controversial. Both fibroatheromas and erosion-prone plaques may be calcified and, occasionally, an isolated calcified nodule has been associated with coronary thrombosis. Using noninvasive and invasive imaging techniques, new in vivo insights into the role of calcification in patient and plaque vulnerability are emerging. The computed tomography (CT)-derived coronary artery calcium score (CACS) accounts for the area and the maximum density of each detected calcium deposit in the entire coronary tree and has proven useful in predicting future cardiovascular events in asymptomatic patients at intermediate risk. CT angiography has demonstrated that hypolucent plaques with positive remodeling or a napkin-ring sign predict future cardiac death, myocardial infarction, or acute coronary syndromes (ACS; patient-level analysis). Finally, prospective intravascular ultrasound (IVUS) studies have shown that a large plaque burden, small minimal lumen area (MLA), and composition consistent with a thin-cap fibroatheroma by radiofrequency analysis identifies those plaques that are likely to cause future adverse cardiovascular events (lesion-level analysis). In this regard, coronary calcification has been correlated with plaque burden but not luminal stenosis. Reconciling these differences, especially the apparent discordance between plaque burden, coronary calcium, and lipid as risk factors is a matter of importance.
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