title: Intra-His bundle block in 2:1 atrioventricular block.
abstract: Intra-hisian atrioventricular (AV) block is not a common phenomenon, but it is important for the development of advanced or complete AV block. We observed a 77-year-old female patient with the 2:1 AV block due to an intra-hisian block. In this case we tried to detect the block site, but an alternating pattern of the AH conduction was noted on the His-electrogram in the electrophysiological study (EPS). The cause of the confusing finding might have been the instability of the catheter to record a His potential. We could detect a splitting of the His-electrogram with an intra-hisian block after minimal manipulation of the catheter. The authors' observations suggest that catheter stability is important for a precise recording in the EPS and radiofrequency catheter ablation procedure.
authors.affiliation: Seung Pyo Hong, Yon Woong Park, Young Soo Lee, Division of Cardiology, Department of Internal Medicine, Daegu Catholic University Medical Center, Daegu 705-718, South Korea.
authors.forename: Seung Pyo
authors.initials: SP
authors.lastname: Hong
authors.affiliation: Seung Pyo Hong, Yon Woong Park, Young Soo Lee, Division of Cardiology, Department of Internal Medicine, Daegu Catholic University Medical Center, Daegu 705-718, South Korea.
authors.forename: Yon Woong
authors.initials: YW
authors.lastname: Park
authors.affiliation: Seung Pyo Hong, Yon Woong Park, Young Soo Lee, Division of Cardiology, Department of Internal Medicine, Daegu Catholic University Medical Center, Daegu 705-718, South Korea.
authors.forename: Young Soo
authors.initials: YS
authors.lastname: Lee
keywords: Atrioventricular block; Bundle of His; Cardiac electrophysiologic techniques