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.