ECG 1. Sinus rhythm interrupted by polymorphic VT.
ECG 2. Polymorphic VT.
ECG 3. Polymorphic VT progresses to ventricular fibrillation (VF).
ECG 4. Polymorphic VT progresses to ventricular fibrillation (VF).
ECG 5. Ventricular fibrillation (VF).
ECG 6. Delivery of shock during ventricular fibrillation (VF).
