A Prospective Multicenter Real-World Registry of Quantitative Flow Ratio-Guided Coronary REvascularization and QuAlity evaLuation

This prospective, multicenter observational registry aims to establish a QFR-based quality control standard system for coronary revascularization in patients with coronary artery disease. The study will enroll over 10,000 patients with visually estimated at least one main branch coronary stenosis ≥50% from more than 50 centers across China (covering provincial, municipal, and county-level hospitals). Coronary angiographic images and intracoronary imaging (if available) will be collected and retrospectively analyzed by an independent core laboratory. The primary endpoint is QFR acquisition accessibility, defined as the mean of QFR usage proportion across centers.

Inclusion Criteria: * Age ≥18 years * Coronary angiography showing visually estimated at least one main branch coronary stenosis ≥50% in patients with acute coronary syndrome (including unstable angina, non-ST-segment elevation myocardial infarction, and ST-segment elevation myocardial infarction \>4 weeks after onset) or chronic coronary syndrome (including stable angina and asymptomatic myocardial ischemia) who undergo PCI or receive conservative treatment * Ability to understand the study design and provide written informed consent Exclusion Criteria: * ST-segment elevation myocardial infarction within 4 weeks of onset * History of coronary artery bypass grafting (CABG) or planned CABG within 6 months * Inability to undergo coronary angiography * Non-cardiac cause with expected survival \