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Case Reports
. 2004 Mar;27(3):415-6.
doi: 10.1111/j.1540-8159.2004.00455.x.

Inappropriate ICD therapy due to proarrhythmic ICD shocks and hyperpolarization

Edward Healy  1 , Sanjeev Goyal, Clifford Browning, Dionyssis Robotis, Karthick Ramaswamy, Karen Rofino-Nadoworny, Lawrence Rosenthal
Affiliations
Case Reports

Inappropriate ICD therapy due to proarrhythmic ICD shocks and hyperpolarization

Edward Healy et al. Pacing Clin Electrophysiol. 2004 Mar.

Abstract

A 50-year-old man with an ischemic cardiomyopathy underwent ICD implantation for inducible ventricular fibrillation (VF). Sixteen months later he experienced inappropriate ICD therapy due to atrial fibrillation with a rapid ventricular response. The initial shock resulted in the initiation of VF (proarrhythmia) and the patient received an additional shock converting his rhythm to an idioventricular rhythm with a cycle length of 490 ms (122 beats/min). Due to lead hyperpolarization, the device oversensed ventricular events and the patient subsequently received additional shocks.

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