Keywords: Cardiac arrest; Defibrillators; ICD sensing; ICD, implantable cardioverter-defibrillator; S-ICD, subcutaneous implantable cardioverter-defibrillator; Subcutaneous ICD; TV-ICD, transvenous implantable cardioverter-defibrillator; TWOS, T-wave oversensing; Ventricular arrhythmias; implantable.