Vol 16, No 5 (2009)
Case Reports
Published online: 2009-07-31

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Multiple shocks after upgrade of an implantable cardioverter-defibrillator to a cardiac resynchronization therapy-defibrillator device

Gregory M. Francisco, Saumya Sharma, Anne H. Dougherty, Bharat K. Kantharia
Cardiol J 2009;16(5):473-476.


Inappropriate shocks from implantable cardioverter-defibrillators (ICDs) may occur for many reasons. Inappropriate shocks are not simply painful inconveniences for patients; they also may result in the need for further operative procedures, and sometimes even death. Herein, we report the case of a patient who after upgrade of an ICD to a cardiac resynchronization therapy-defibrillator device (CRT-D), returned with multiple shocks due to altered sensing and defibrillation polarities that resulted from actual physical reversal of the distal (–) and proximal (+) lead terminals in the header of the device.

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