Non-stenting Treatment Strategy for Acute Myocardial Infarction With Non-severe Stenosis(EROSION IV)

This study is a prospective, multicenter, open-label, non-inferiority, randomized controlled trial. A total of 2,000 patients with STEMI (\<24 hours or 7-14 days) or NSTEMI will be recruited from at least 20 centers in China. Eligible patients must have residual DS \< 70% at the culprit lesion assessed by QCA, with optional thrombus aspiration, and TIMI flow of grade 3. Patients will be randomly assigned in a 1:1 ratio to the experimental group or the control group. The planned enrollment period is 36 months, and all patients will be followed up for at least 12 months after randomization, with continued follow-up until the end of the study. The primary outcome is the first occurrence of TLF after randomization, defined as the composite of cardiovascular death, target vessel myocardial infarction, ischemia-driven target lesion revascularization. The study aims to verify whether guideline-recommended standard medical therapy is non-inferior to DES implantation combined with guideline-recommended standard medical therapy in AMI patients with non-severe coronary artery stenosis. A total of 120 participants (60 in the experimental group and 60 in the control group) enrolled at the Second Affiliated Hospital of Harbin Medical University were included in the functional substudy. Using Abbott Pressure Wire™X pressure wire test functional indicators, and explore the incidence of coronary microvascular dysfunction (CMD) as assessed by the index of microcirculatory resistance (IMR) in two groups, and its impact on the rate of the composite endpoint of all-cause death and heart failure readmission occurring for the first time within 12 months.