Repetitive shock therapy of subcutaneous implantable cardioverter defibrillators in a patient with idiopathic ventricular fibrillation: What is the mechanism?

A 45-year-old man was admitted to our hospital due to repetitive shock therapies from a subcutaneous implantable cardioverter defibrillator (ICD) without syncope during the daytime. When he was 35-years-old, he was resuscitated from ventricular fibrillation (VF) during sleep. He was diagnosed with idiopathic ventricular fibrillation (VF) (J wave syndrome), and a dual chamber transvenous ICD (TV-ICD) was implanted in another hospital. When he was 44-years-old, he received repetitive inappropriate ICD shocks due to lead dysfunction, and therefore a subcutaneous ICD (S-ICD) was implanted. This article is protected by copyright. All rights reserved.