ACTIVE W

Clopidogrel plus aspirin versus oral anticoagulation for atrial fibrillation in the Atrial fibrillation Clopidogrel Trial with Irbesartan for prevention of Vascular Events (ACTIVE W): a randomised controlled trial. - The Lancet - 2006

Brief Summary:

Among patients with nonvalvular AF, combination aspirin/clopidogrel is inferior to warfarin for the prevention of stroke, systemic embolism, MI, and CV death, and appears to cause at least as much bleeding.

Reference: http://www.ncbi.nlm.nih.gov/pubmed/16765759