Discussion
The major finding of present study are as follows: 33 out of 84 AF patients, who were underwent Watchman LAAC combined with AFCA, developed PDL, and incomplete endothelialization was found in 7 out of the 51 patients without PDL by CCTA at 6 months post procedure. Maximum diameter of LAA orifice could be used to predict the occurrence of PDL. These data thus indicate the close association between LAA orifice size and the occurrence of PDL post LAAC.