This patient had no significant past medical history. She presented with dizziness. There was the possibility of syncope but it was not witnessed. She did not report chest pain, shortness of breath, palpitations, or other symptoms except moderate fatigue and lethargy. Echocardiography showed severe left ventricular dysfunction. Cardiac catheterization showed moderate coronary disease out of proportion to the underlying left ventricular dysfunction. While on telemetry, a long run of Non-Sustained Ventricular Tachycardia was observed. Later, her relatives reported several remote episodes during which the patient's eyes rolled back and she 'turned blue'. Based on the historical information, severe LV dysfunction, and NSVT, a defibrillator was implanted.

Several weeks after implantation, the patient returned for routine non-invasive evaluation of the defibrillator. No shocks or runs of VT had been recorded.

Two weeks later, the patent was admitted with incessant VT requiring over 20 shocks. The tracing shown above was recovered during defibrillator interrogation. She was started on amiodarone and was discharged uneventfully.