the stroke prevention in atrial fibrillation study is a 15-center randomized clinical trial examining the risks and benefits of low-intensity warfarin ( prothrombin time of 1.3-1.8 times control ) and aspirin ( 325 mg/day ) in patients with constant or intermittent atrial fibrillation .
C0004238
atrial fibrillation
C0043031
warfarin