Prospective Randomized Evaluation of the Watchman Left Atrial Appendage Closure Device in Patients With Atrial Fibrillation Versus Long-Term Warfarin Therapy: The PREVAIL Trial

Study Questions:

How does left atrial appendage (LAA) occlusion compare with long-term oral anticoagulation in patients with nonvalvular atrial fibrillation (AF) who are at risk for thromboembolic events?