Effects of LBBAP on QRSd
The pre- and post-procedural effects of LBBAP on QRSd were compared in 14 studies. LBBAP was significantly associated with shortened QRSd, with a mean difference of −48.10 msec (95% CI −60.16 to −36.05, I2 = 96.7%) compared with the baseline of the patients. Notably, there were no differences among PICM versus non-PICM patients (−58.67 vs. −45.49, p = 0.10) nor in the Chinese versus non-Chinese population (−53.58 vs. −34.94, p = 0.14).