Vol 19, No 2 (2012)
Interesting electrocardiograms
Published online: 2012-03-30

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Paradoxical atrial undersensing by a dual chamber pacemaker during atrial fibrillation

S. Serge Barold, Bengt Herweg
Cardiol J 2012;19(2):207-209.


This report describes paradoxical atrial undersensing by a dual chamber pacemaker in a patient with paroxysmal atrial fibrillation. Atrial undersensing was present only when the device was programmed to a high sensitivity but sensing normalized when a lower sensitivity was programmed. This unusual response should be differentiated from the recently documented lock-in behavior of pacemakers delivering managed ventricular pacing. (Cardiol J 2012; 19, 2: 207–209)

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