"Antiplatelet Therapy for Stable Coronary Artery Disease in Atrial Fibrillation Patients on Oral Anticoagulant: A Nationwide Cohort Study"
Circ
http://circ.ahajournals.org/content/early/2014/01/27/CIRCULATIONAHA.113.004834.abstract
"Conclusions—In AF patients with stable CAD, adding antiplatelet therapy on top of VKA is not associated with a reduction in risk of recurrent coronary events or thromboembolism, while risk of bleeding is significantly increased. The common practice of adding antiplatelet therapy to oral VKA anticoagulation in patients with AF and stable CAD warrants reassessment."