A 66-year-old man has had cough and worsening shortness of breath for 3 years On examination, there is dullness to percussion at both lung bases and poorly audible breath sounds. On physical examination, pulse is 77/ min and BP is 110/80 mm Hg. He does not have anginal pain. His liver span is increased to 14 cm. He has pitting edema to his knees Jugular venous distention is noted to the angle of the jaw at 45-degree elevation of his head while lying down. Which of the following is most likely causing his heart disease?