Occurrence of Incomplete Endothelialization Causing Residual Permeability After Left Atrial Appendage Closure.

We found that incomplete endothelialization, defined as residual permeability on cardiac computed tomography without peridevice leak on transesophageal echocardiography, occurred in 61% of the patients after 10 ± 6 months of percutaneous LAA closure. Predisposing factors and appropriate monitoring of LAA patients remain to be determined in larger cohorts.