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Multicenter Registry for Angiography-Derived Quantitative Flow Ratio
1. to investigate the feasibility and diagnostic performance of contrast quantitative flow ratio (QFR) for identifying the functional significance of intermediate degree stenotic lesions in all-comer patients with coronary artery disease (CAD) including presentation of acute myocardial infarction (AMI) with non-culprit lesion. 2. to compare the changes of contrast QFR and fractional flow reserve (FFR) according to severity of percent diameter stenosis (%DS) 3. to evaluate prognostic implication of contrast QFR in comparison with FFR
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