Infra-His Block in a Normal Heart

Alasti, Mohammad and Alizadeh, Abolfath and Fazelifar, Amirfarjam and Ali Sadr-Ameli, Mohammad (2006) Infra-His Block in a Normal Heart. [Journal (Paginated)]

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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?

Item Type:Journal (Paginated)
Keywords:His-purkinje system; infra-his block
Subjects:JOURNALS > Indian Pacing and Electrophysiology Journal
ID Code:5239
Deposited By: Indian Pacing and Electrophysiology, Journal
Deposited On:28 Oct 2006
Last Modified:11 Mar 2011 08:56


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