2.2. Search Strategy
Two independent reviewers (Z.Y.Z and F.L) conducted comprehensive searches of four online databases (Cochrane Library, Embase, PubMed and Web of Science) from inception to 1 December 2022. Search keywords were “ICE”,“Intracardiac echocardiography”,“TEE ”,“transesophageal echocardiography” ,“atrial fibrillation”, “LAAC”, “left atrial appendage closure”, “LAAO”, and “left atrial appendage occlusion” Clinical studies related to the outcomes of ICE or outcomes comparing TEE vs. ICE for endocardial LAAO were included. Reference lists of review articles were hand searched, and eligible articles were searched for potential publications not previously identified.