Adam Rubin, MD

An 83-year-old man complains of weakness, easy fatigability, and poor appetitethat began 4 to 6 weeks ago. He becomes short of breath on his daily walksand has lost about 20 pounds over the last 3 months. He denies nocturia,paroxysmal nocturnal dyspnea, exertional chest pain, fever, cough, melena,and hematochezia. His only GI symptom is occasional crampy abdominal painwith bowel movements.