The fatal consequence of inappropriate therapy in a single VF zone primary prevention defibrillator.

We report a case of inappropriate implantable cardioverter defibrillator (ICD) therapy due to single ventricular fibrillation (VF) zone programming leading to patient death. A remote transmission was received from a patient with a cardiac resynchronization therapy-defibrillator showing sinus tachycardia in the VF detection zone initiating inappropriate shocks and resulting in shock refractory VF. This case report highlights the importance of manufacturer specific ICD programming. In devices without discrimination in the VF zone, a higher rate single VF detection zone and/or addition of a ventricular tachycardia zone with supraventricular tachycardia discrimination should be considered.