"On-Off" phenomenon in a case of concealed left lateral atrio-ventricular accessory pathway - What is the mechanism?

We report a case of symptomatic supraventricular tachycardia who had absent VA conduction during electrophysiology study. The interesting finding was appearance of VA conduction only at a specific cycle length of ventricular pacing which reproducibly induced a sustained orthodromic re-entrant tachyc...

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Bibliographic Details
Published in:Indian pacing and electrophysiology journal 2024, Vol.24 (3), p.160-162
Main Authors: Mukherjee, Sanjeev S, Bera, Debabrata, Halder, Ashesh, Choudhury, Saroj Kumar
Format: Report
Language:English
Online Access:Get full text
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Summary:We report a case of symptomatic supraventricular tachycardia who had absent VA conduction during electrophysiology study. The interesting finding was appearance of VA conduction only at a specific cycle length of ventricular pacing which reproducibly induced a sustained orthodromic re-entrant tachycardia (ORT). We review the literature and conclude that supernormal AP conduction can explain such phenomenon.
ISSN:0972-6292
0972-6292
DOI:10.1016/j.ipej.2024.02.001