1. Objective Objective: \> The purpose of this study is to evaluate whether a short-term (1-month) dual antiplatelet therapy (DAPT) followed by single antiplatelet therapy (SAPT) is non-inferior to the standard 6-month DAPT in patients undergoing Drug-Coated Balloon (DCB) angioplasty for de novo small coronary artery disease.
Methods: \> This is an open-label, randomized, non-inferiority trial. Patients will be assigned to either 1 month or 6 months of DAPT after successful DCB treatment. The study will compare the incidence of Net Adverse Clinical Events (NACE)-a composite of cardiovascular death, myocardial infarction, target vessel revascularization, and major bleeding-between the two groups from 1 to 12 months post-procedure. 2. Background Following percutaneous coronary intervention (PCI), dual antiplatelet therapy (DAPT) is essential to prevent stent thrombosis and ischemic events. While short-duration DAPT (e.g., 4 weeks) has shown benefits in patients at high bleeding risk, evidence regarding the optimal DAPT duration specifically after Drug-Coated Balloon (DCB) angioplasty for small vessel disease remains insufficient. This study aims to fill this clinical gap by comparing 1-month versus 6-month DAPT strategies.
Primary Objective To demonstrate the non-inferiority of 1-month DAPT (followed by SAPT up to 12 months) compared to 6-month DAPT in terms of Net Adverse Clinical Events (NACE) occurring between 1 and 12 months post-randomization.
Secondary Objectives To evaluate ischemic safety (CV death, MI, TLR). To assess bleeding safety (BARC type 2, 3, or 5). To analyze individual components of the primary composite endpoint, including all-cause death and stent thrombosis.
1)Adults aged 19 years or older 2)Subjects who have undergone drug-coated balloon (DCB) angioplasty 3) Subjects with stable angina, asymptomatic ischemia, and angiographically confirmed coronary lesions 4)Patients who have not undergone coronary intervention and whose coronary angiography demonstrates a reference vessel diameter between 2.0 mm and 3.0 mm, meeting all of the following conditions: No severe dissection corresponding to National Heart, Lung, and Blood Institute (NHLBI) grade C to F No reduction in coronary blood flow defined as TIMI flow grade < 2 No residual stenosis ≥ 30% 5)Patients newly diagnosed with small-vessel coronary artery disease among those maintained on single antiplatelet therapy (SAPT) for at least 6 months after undergoing: de novo percutaneous coronary intervention (de novo PCI),in-stent restenosis PCI (ISR PCI), or percutaneous transluminal coronary angioplasty (PTCA) 6)Subjects who voluntarily agree to participate in this clinical study and provide written informed consent
1) Patients diagnosed with Acute Coronary Syndrome (ACS), including STEMI, NSTEMI, or Unstable Angina.
Parallel
1-Month DAPT followed by SAPT
DrugAspirin 100 mg and Clopidogrel 75 mg daily for 1 month, followed by single antiplatelet therapy (Aspirin 100 mg or Clopidogrel 75 mg) up to 12 months.
6-Month DAPT followed by SAPT
DrugAspirin 100 mg and Clopidogrel 75 mg daily for 6 months, followed by single antiplatelet therapy (Aspirin 100 mg or Clopidogrel 75 mg) up to 12 months.
Primary Validation Variables
Cumulative incidence of NACE, defined as a composite of cardiovascular (CV) death, non-fatal myocardial infarction (MI), target vessel revascularization, and bleeding (BARC type 3 or 5), assessed from the time of first dose of study drug through 12 months.
Secondary Validation Variables:
\[Outcome Measure 1\] Title: Composite of CV Death, Non-fatal MI, and Target Lesion Revascularization (TLR) Time Frame: 1, 3, 6, and 12 months Description: Cumulative incidence of the composite endpoint (cardiovascular death, non-fatal myocardial infarction, and target lesion revascularization). \[Outcome Measure 2\] Title: Composite of BARC Bleeding Type 2, 3, or 5 Time Frame: 1, 3, 6, and 12 months Description: Incidence of bleeding events according to the Bleeding Academic Research Consortium (BARC) criteria. \[Outcome Measure 3\] Title: Landmark Analysis of NACE between 1 and 12 Months Time Frame: From 1 month up to 12 months after the index PCI Description: Composite of CV death, MI, TLR, and BARC bleeding type 3 or 5, assessed specifically for the interval between 1 month and 12 months post-index PCI. \[Outcome Measure 4\] Title: Individual Components of Clinical Endpoints Time Frame: 1, 3, 6, and 12 months Description: Incidence of each individual component: all-cause death,
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