Clopidogrel outperformed aspirin in what is believed to be the first and largest randomized trial to compare the effectiveness of the two antiplatelet drugs as long-term maintenance therapy for patients who had no adverse events after one year of dual antiplatelet therapy (DAPT) following the insertion of a coronary stent. After two years of follow-up, chronic maintenance therapy with clopidogrel resulted in a 30% reduction in deaths, heart attacks, strokes or major bleeding events, according to research presented at the American College of Cardiology’s 70th Annual Scientific Session.