Aspirin Monotherapy Versus Sequential Warfarin-Aspirin Therapy After TAVR in Patients With Pure Aortic Regurgitation

This multicenter randomized controlled trial evaluates antithrombotic strategies post-TAVR in severe aortic regurgitation patients without long-term anticoagulation. Patients are randomized 1:1 to aspirin 75-100 mg daily for 12 months versus warfarin (INR 2-3) for 6 months followed by aspirin for 6 months. Primary hypothesis: aspirin is superior for bleeding and non-inferior for death/thrombosis. Primary endpoint is a composite of death, stroke, thrombosis, MI, embolism, and major bleeding at 1 year. Sample size: 1172. Follow-up: 30 days, 6 months, 12 months.