USMLE® Step 1 style questions USMLE
USMLE® Step 2 style questions USMLE
A 17-year-old teenage boy comes to the office because of generalized leg weakness. His medical history is relevant to a recently diagnosed idiopathic heart failure. Upon medical interrogation, the patient claims that lately, he stumbles easily when he walks. Physical exam shows a "duck-like" walk and bilaterally enlarged calf muscles. His temperature is 36.4°C (97.5°F), pulse is 90/min, respirations are 17/min, blood pressure is 120/80 mmHg. Laboratory findings show increased serum creatine kinase. Which of the following mutations is the most likely cause of this patient's current condition?