Symptomatic Atrioventricular Block in an Atriofascicular Pathway Inserting into the Left Bundle Branch Without Apparent Atrioventricular Node Function

Abstract

We report a patient with symptomatic AV block associated with conduction solely through an atriofascicular pathway that inserted into the left bundle branch. There was no apparent conduction present through the AV node. There was, however, passive activation through the His-Purkinje system. His-bundle pacing demonstrated normal conduction through both right and left bundles. This is the first report of such a case.