Abstract
An 88-year-old female presented with inappropriate implantable cardioverter-defibrillator shocks. Interrogation revealed lead noise sensed as ventricular fibrillation, leading to 11 shocks in 1 day. A defibrillation at the period of maximal vulnerability caused true ventricular fibrillation/ventricular tachycardia and additional shocks, which failed to terminate device-initiated tachyarrhythmia. The patient recovered spontaneously and the device was reprogrammed. (Level of Difficulty: Intermediate.).