USMLE® Step 1 style questions USMLE
USMLE® Step 2 style questions USMLE
A 82-year-old man is brought to the emergency department because of muscle weakness and general discomfort. The patient is confused and says he has a headache, he feels thirsty, and that he has not urinated for the past 4 days. He lives with his son and his family, and says that he does the same thing every day, which is watching TV and stay in his room. His temperature is 39.5°C (103.1°F), pulse is 110/min, respirations are 14/min, and blood pressure is 90/65 mm Hg. Physical examination shows purple fingernails.Which of the following is the most likely cause of muscle weakness in this patient's condition?