Mr. B is an 84 year-old African-American male veteran

with a history of type 2 diabetes and hypertension who was

admitted to the VA hospital for hypertensive urgency. In

the ICU, he became unresponsive and pulseless. Telemetry

showed “ventricular fibrillation” which spontaneously

converted to sinus rhythm. An echocardiogram showed an

ejection fraction of 60%. An ECG performed prior to the

ventricular arrhythmia is shown below.