MSFinals-6071

An 80-year-old man is brought to the hospital following a fall. He reports feeling increasingly dizzy when moving around his apartment, but denies losing consciousness. He has a medical history of heart failure, hypertension, and type 2 diabetes. His medications were recently adjusted by the hospital clinic and include bendroflumethiazide, aspirin, ramipril, gliclazide, furosemide, simvastatin, and a newly prescribed doxazosin. What single observation would aid in establishing his diagnosis?