title: Multiple shocks after upgrade of an implantable cardioverter-defibrillator to a cardiac resynchronization therapy-defibrillator device.
abstract: 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.
authors.affiliation: Division of Cardiology, University of Texas, Medical School at Houston, Houston, Texas 77030, USA.
authors.forename: Gregory M
authors.initials: GM
authors.lastname: Francisco
authors.forename: Saumya
authors.initials: S
authors.lastname: Sharma
authors.forename: Anne H
authors.initials: AH
authors.lastname: Dougherty
authors.forename: Bharat K
authors.initials: BK
authors.lastname: Kantharia
mesh_terms: D000200:Action Potentials; D000368:Aged; D002304:Cardiac Pacing, Artificial / Q000009:adverse effects*; D009202:Cardiomyopathies / Q000150:complications / Q000503:physiopathology / Q000628:therapy*; D017147:Defibrillators, Implantable / Q000009:adverse effects*; D004554:Electric Countershock / Q000009:adverse effects* / Q000295:instrumentation; D011211:Electric Power Supplies; D004559:Electric Wiring; D022062:Electrophysiologic Techniques, Cardiac; D004867:Equipment Design; D004868:Equipment Failure; D006801:Humans; D008297:Male; D010138:Pacemaker, Artificial / Q000009:adverse effects*; D012815:Signal Processing, Computer-Assisted; D017180:Tachycardia, Ventricular / Q000175:diagnosis / Q000209:etiology / Q000503:physiopathology / Q000628:therapy*