An asymptomatic old patient presents with bruit in the carotid artery. Which of the following is the investigation of choice?: (A) Doppler ultrasonography, (B) Internal carotid angiography, (C) Aortic arch angiography, (D) Spiral CT angiography
Answer is A. Bruit over carotid artery suggests carotid artery stenosis.
Duplex scanning (B-mode scan and doppler ultrasonic velocimetry) is the method of choice for assessing the degree of carotid stenosis.