Abstract
Pericardial effusion is a serious complication following percutaneous left atrial appendage occlusion and is associated with adverse outcomes. While acute effusions occur from procedure associated macro-perforations, delayed effusions are less well understood. Reported here is a case of a hemorrhagic pericardial effusion presenting almost 6 months following left atrial appendage occlusion and successfully treated with corticosteroids. LEARNING OBJECTIVE: Delayed pericardial effusions following left atrial appendage occlusion occur due to microperforations. These pericardial effusions can cause hemopericardium and pericardial inflammation. Anti-inflammatory therapy may promote resolution and prevent adverse sequalae.