Painful Left Bundle Branch Block Syndrome Treated With Conduction System Pacing. A Report of Two Cases.

Painful left bundle branch block (LBBB) syndrome is a rare condition characterized by chest pain associated with the development of LBBB in the absence of myocardial ischemia. Although the mechanism of this entity is not fully understood, the occurrence of retrosternal chest pain is considered to be the consequence of ventricular dyssynchrony induced by LBBB. We present two cases of patients with non-ischemic cardiomyopathy and chest pain associated with intermittent LBBB morphology.