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Paradoxical Undersensing During Atrial Flutter: What Is the Mechanism?
Author(s) -
KALAHASTY GAUTHAM,
KENIGSBERG DAVID N.,
WOOD MARK A.,
ELLENBOGEN KENNETH A.
Publication year - 2006
Publication title -
journal of cardiovascular electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.193
H-Index - 138
eISSN - 1540-8167
pISSN - 1045-3873
DOI - 10.1111/j.1540-8167.2006.00571.x
Subject(s) - medicine , atrial flutter , cardiology , anesthesia , atrial fibrillation
A 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.”