5 CONCLUSIONS
This study shows that the LBBAP electrode can be safely paced over a wide range. At RAO 30°, the pacing electrode located in the rectangle formed by connecting the central points of the PM, M, PI and MI is safe for the coronary artery. Locating the electrode in the PM position can not only quickly capture the left bundle branch, but also improve the safety of the coronary artery. The risk of anterior descending branch injury was greater than posterior descending branch injury.