Left Atrial Appendage: Anatomy, Function, and Importance in Thrombus Formation

The left atrial appendage (LAA) is an extension of the atrium (LA) and has complex anatomical structure unique pathophysiological properties. LAA functions as a decompression chamber during ventricular (LV) systole under increased pressure conditions. Despite previously being considered relatively insignificant portion cardiac anatomy, been highlighted important involved in genesis thrombus formation thromboembolic events. With recent development percutaneous closure devices, morphology assessments have become increasingly important. This article aims to describe anatomy morphology, function assessment parameters, diagnostic challenges, main imaging modalities, particularly transesophageal echocardiography.