DW is a 5' 9", 65-year-old, 135-kg black male who visited his primary care physician for a routine examination. His BP was 158/96 mmHg and his heart rate was 71 bpm. Stroke volume and cardiac output were normal. Serum renin levels were in the normal range. A chest x-ray revealed left ventricular hypertrophy. Other clinical findings were unremarkable.