Figure 1. Study flowchart.
CABG: coronary artery bypass graft; CTO: chronic total occlusion; FFR: fractional flow reserve; GFR: glomerular filtration rate; LMCA: left main coronary artery; LVEF: left ventricular ejection fraction; NSTEMI: non-ST-elevation myocardial infarction; PCI: percutaneous coronary intervention; QFR: quantitative flow ratio; RCA: right coronary artery; STEMI: ST-elevation myocardial infarction.