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Wiley InterScience | ||||||||||
  Journal of Cardiovascular ElectrophysiologyVolume 17 Issue 11, Pages 1252 - 1254 Published Online: 27 Jul 2006 Journal compilation © 2010 Wiley Periodicals, Inc.
Abstract | References | Full Text: HTML, PDF (Size: 105K) | Related Articles | Citation Tracking 
Arrhythmia Rounds
Editor: George J. Klein, M.D. Paradoxical Undersensing During Atrial Flutter: What Is the Mechanism? J Cardiovasc Electrophysiol, Vol. 17, pp. 1252-1254, November 2006. Copyright 2006 by Futura Publishing Company, Inc. KEYWORDS
atrial flutter
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pacemaker undersensing
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quiet timer blanking
Pacemaker Undersensing During Atrial Flutter. ABSTRACTA patient with congenital complete heart block underwent implantation of a dual-chamber pacemaker. He presented to the emergency room with fatigue and was found to be in atrial flutter. Device interrogation revealed undersensing of 5 mV flutter waves at a programmed sensitivity of 0.5 mV. Due to undersensing, mode switch did not occur. This case illustrates apparently paradoxical undersensing of atrial flutter waves by a dual-chamber pacemaker and can be explained by a phenomenon known as "quiet timer blanking." | 
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