%A Mohammad Alasti
%A Abolfath Alizadeh
%A Amirfarjam Fazelifar
%A Mohammad Ali Sadr-Ameli
%J Indian Pacing and Electrophysiology Journal
%T Infra-His Block in a Normal Heart

%X 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?

%N 3
%K His-purkinje system; infra-his block

%P 184-185
%E Balbir Singh
%E Yash Lokhandwala
%E Johnson Francis
%E Anup Gupta
%E Joydeep Ghosh
%V 6
%D 2006
%I Indian Pacing and Electrophysiology Group
%L cogprints5239

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