Natural History of Coronary Atherosclerosis

Inclusion Criteria: * General Inclusion Criteria: 1. Age ≥18 years 2. Acute myocardial infarction ≤ 45 days 3. Planned coronary angiography examination or potential interventional treatment * Angiographic Inclusion Criteria: 1. The presence of at least 1 non-flow-restricting lesion (visually estimated diameter stenosis: 30%-80%; QFR \> 0.80) in any non-infarct related artery with RVD ≥2.5 mm by visual assessment Exclusion Criteria: * General exclusion Criteria: 1. Cardiogenic shock 2. Pregnant or woman of child-bearing potential 3. Life expectancy less than 1 year for non-cardiac causes 4. Unable to tolerate contrast agents or anticoagulant/antiplatelet therapy 5. Prior CABG or planned CABG * Angiographic exclusion Criteria: 1. Poor angiographic image quality precluding vessel contour detection or with suboptimal contrast opacification, branch ostium cannot be shown clearly, severe overlap in the stenosed segment or severe tortuosity of any interrogated vessel deemed not amenable to QFR or RWS measurement 2. An interrogated lesion require surgical bypass grafting 3. Unable to judge culprit lesion or infarct-related artery according to current evidence