Procedure
PCI was performed according to the standard technique. Decisions of the vascular access site, pre‐dilatation or direct stenting, the use of glycoprotein IIb/IIIa inhibitors, use of intravascular ultrasound (IVUS) or OCT, use of a pressure wire, a technique for bifurcation or chronic total occlusion lesion, and stent selection including type, length, and diameter was at the operator's discretion. A staged procedure was allowed, which was not counted as revascularization.The selection and duration of antiplatelet therapy was at the operator's discretion. A loading dose of aspirin (300 mg) and P2Y12 inhibitor (clopidogrel [600 mg], prasugrel [60 mg], or ticagrelor [180 mg]) was administered to all the patients at least 6 h before the procedure unless the patient had been taking these medications or the procedure was an emergency. After the index PCI, dual antiplatelet therapy (DAPT) with a maintenance dose of aspirin (100 mg) and P2Y12 inhibitor (clopidogrel [75 mg QD], prasugrel [10 mg QD], or ticagrelor [90 mg BID]) was encouraged for at least 12 months. Guideline‐directed medical treatment using beta‐blockers, renin‐angiotensin‐aldosterone system inhibitors, and statins was also encouraged.