Clinical validation of the 2021 European Society of Cardiology guidelines on preexisting right bundle branch block in patients undergoing transcatheter aortic valve implantation

Risk stratification of patients with right bundle branch block (RBBB) undergoing transcatheter aortic valve implantation (TAVI) remains challenging. This study aimed to evaluate the European Society of Cardiology (ESC) criteria for risk stratification of RBBB patients undergoing TAVI. We retrospectively analyzed prospectively enrolled patients with preexisting RBBB undergoing TAVI between 2011 and 2023. A surface 12-lead electrocardiogram was available before and after the procedure in all patients. The following ESC criteria were validated: ΔPR interval ≥20 ms, QRS axis change, and transient high-degree atrioventricular block (HAVB)