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The subcutaneous implantable cardioverter-defibrillator (S-ICD) is a novel technology with proven efficacy in sudden cardiac death prevention; however, there is a lack of long-term safety data. We describe the case of a 55-year-old female patient implanted with an S-ICD due to idiopathic ventricular fibrillation, who subsequently presented with inappropriate shocks leading to ventricular fibrillation that was successfully terminated by another shock. Inappropriate shocks were due to intermittent T wave oversensing during periods of rate-dependent right bundle branch block. Assessment of the S-ICD electrograms during an exercise test allowed successful reprogramming of the device׳s sensing vector with no further events.

Original publication

DOI

10.1016/j.joa.2016.05.006

Type

Journal article

Journal

J Arrhythm

Publication Date

02/2017

Volume

33

Pages

73 - 75

Keywords

Bundle branch block, Implantable defibrillator, Inappropriate shock, Oversensing, Ventricular fibrillation