Gaurav A. Upadhyay

Gaurav A. Upadhyay, MD, and Jeremy S. Treger, MD, PhD discuss a revised definition of left bundle branch block using time to notch in lead I. They explore challenges in defining LBBB, study conduction system pacing, introduce a new criterion for diagnosis, emphasize measuring notches in lead I, and stress the importance of ECGs in diagnosing cardiac conditions.