AUTHOR=Yang Liu , Chen Zhijian , Zhang Min 

TITLE=Case Report: An Unusual Case of Fasciculoventricular Pathway

JOURNAL=Frontiers in Cardiovascular Medicine

VOLUME=Volume 9 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/cardiovascular-medicine/articles/10.3389/fcvm.2022.818275

DOI=10.3389/fcvm.2022.818275

ISSN=2297-055X

ABSTRACT=A 30-year-old man with an electrocardiogram (ECG) demonstrating ventricular preexcitation with a normal PR interval as well as a QR pattern in the Lead V1 was evaluated. Electrophysiology studies showed a normal AH interval and a shortened HV interval at sinus rhythm; while the degree of preexcitation (QRS waveform) and HV interval were not affected by multisite or incremental atrial pacing. These findings implied ventricular preexcitation due to a fasciculoventricular pathway (FVP). Moreover, temporarily blocking the FVP conduction mechanically resulted in a normal HV interval, absence of delta wave and a rSR’ pattern in V1, which indicated incomplete right bundle branch block (IRBBB). These findings suggested the coexistence of FVP and IRBBB, which is very rare.