Risk Versus Benefit of Combined Aspirin and Warfarin Therapy in Patients With Atrial Fibrillation.

Purpose: Guidelines have differing recommendations for aspirin use in patients with an indication for anticoagulation. The purpose of this study was to evaluate the incidence of major bleeding and thromboembolic events (TEs) in patients with atrial fibrillation (AF) receiving warfarin alone (monotherapy group) versus warfarin plus aspirin (combination therapy group).

Methods: This was a retrospective, cohort study including patients from a pharmacist-run anticoagulation clinic.