Left Atrial Appendage Closure: Technical Considerations of Endocardial Closure.

Left atrial appendage closure (LAAC) is a safe and effective therapy for the prevention of stroke in patients with nonvalvular atrial fibrillation and high bleeding risk with oral anticoagulants. Multimodality imaging with transesophageal echocardiography and computed tomography angiography to define the anatomy and its implications on endocardial exclusion is becoming increasingly important. The only LAAC device currently approved for clinical use in the United States is the WATCHMAN device. Systematic assessment of the transseptal crossing site, left atrial appendage anatomy, adequate device size selection, and device postdeployment evaluation is essential for the safety and efficacy of the procedure.