Inappropriate ICD therapy due to proarrhythmic ICD shocks and hyperpolarization |
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Authors: | Healy Edward Goyal Sanjeev Browning Clifford Robotis Dionyssis Ramaswamy Karthick Rofino-Nadoworny Karen Rosenthal Lawrence |
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Institution: | Department of Medicine, UMass Memorial Medical Center, Worcester, Massachusetts 05181, USA. |
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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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Keywords: | inappropriate therapy proarrhythmia hyperpolarization |
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