system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 72-year-old man comes to the emergency department because of severe, acute, right leg pain for 2 hours. The patient's symptoms started suddenly while he was doing household chores. He has no history of leg pain at rest or with exertion. Yesterday, he returned home after a 6-hour bus ride from his grandson's home. He has hypertension treated with ramipril. He appears uncomfortable. His temperature is 37.4°C (99.3°F), pulse is 105/min and irregular, and blood pressure is 146/92 mm Hg. The right lower extremity is cool and tender to touch. A photograph of the limb is shown. Femoral pulses are palpable bilaterally; popliteal and pedal pulses are decreased on the right side. Sensation to pinprick and light touch and muscle strength are decreased in the right lower extremity. Which of the following is most likely to confirm the underlying source of this patient's condition?
assistant
Echocardiography