Infra-his block in a normal heart

Alasti, Mohammad; Alizadeh, Abolfath; Fazelifar, Amirfarjam and Sadr-Ameli, Mohammad Ali (2006) Infra-his block in a normal heart. Indian Pacing and Electrophysiology Journal, 6 (3). pp. 184-185. ISSN 0972-6292

Full text available as:

PDF - Requires Adobe Acrobat Reader or other PDF viewer.
173 Kb


A 55 year old man with history of palpitation was referred for electrophysiologic study. Baseline ECG, physical examination and transthoracic echocardiographic study were normal. Electrophysiologic study revealed normal AH and HV intervals. Pacing of right atrium with a cycle length of 300 msec showed 2:1 AV block. AH interval was 252 msec and the block was infra-his (Figure 1). With continual of right atrial pacing, one to one AV conduction with increasing AH interval to 282 msec and QRS widening (LBBB pattern) were being observed. HV intervals during 2:1 block and during 1:1 AV conduction were normal. What is the mechanism? Is it an abnormal finding in this patient?

EPrint Type:Article
Uncontrolled Keywords:Infra-His Block, Normal Heart
Subjects:Diagnosis > Diagnostic Techniques and Procedures > Diagnostic Techniques, Cardiovascular > Heart Function Tests > Electrocardiography
-Journal Repositories > Indian Pacing and Electrophysiology Journal
Cardiovascular Diseases > Heart Diseases > Arrhythmia > Heart Block > Bundle-Branch Block
Cardiovascular Diseases > Heart Diseases > Arrhythmia > Heart Block
Cardiovascular System > Heart > Heart Conduction System
ID Code:1847
Deposited By:Indian Pacing and Electrophysiology Journal
Deposited On:03 October 2006

Archive Staff Only: edit this record