First- and second-degree left bundle branch block and masquerading bundle branch block: Lessons learned during conduction system pacing

Affiliations

• ¹ Division of Cardiovascular Sciences, Department of Medicine, University of South Florida Morsani College of Medicine & Tampa General Hospital, South Tampa Center, Tampa, Florida. Electronic address: Bengt@usf.edu.
• ² Department of Medicine, University of Rochester School of Medicine, Rochester, New York.
• ³ Division of Cardiology, Department of Medicine, Geisinger Heart Institute, Geisinger Wyoming Valley Medical Center, Wilkes-Barre, Pennsylvania.