Fixed Minidose Warfarin and Aspirin Alone and in Combination vs Adjusted-Dose Warfarin for Stroke Prevention in Atrial Fibrillation

Abstract
ATRIAL FIBRILLATION is associated with an overall risk for ischemic stroke of 4.5% per year, which is about 6 times the risk with sinus rhythm.1,2 Seven randomized studies have shown that adjusted-dose oral anticoagulant therapy is effective for primary and secondary prevention of thromboembolic events in patients with nonvalvular atrial fibrillation.3-9 Therefore, anticoagulant therapy with the intensity of the international normalized ratio of prothrombin time (INR) of 2.0 to 3.0 is recommended.10 Antiplatelet therapy seems less effective.