Paradoxical Undersensing During Atrial Flutter: What Is the Mechanism? | Zendy

KALAHASTY GAUTHAM | Zendy; KENIGSBERG DAVID N. | Zendy; WOOD MARK A. | Zendy; ELLENBOGEN KENNETH A. | Zendy

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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.”

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