Management of Carotid Artery Bruit in the Emergency Department

Initial Assessment

• The American College of Radiology recommends duplex carotid Doppler ultrasonography as the initial diagnostic test for detecting hemodynamically significant carotid stenosis in patients with a carotid bruit, with 90% sensitivity and 94% specificity for identifying clinically significant stenosis (>70%) 1, 3
• The presence of a carotid bruit correlates more closely with systemic atherosclerosis than with significant carotid stenosis, but still warrants investigation, according to the American Heart Association 5, 6

Diagnostic Algorithm

• The American College of Radiology suggests that carotid Duplex Ultrasonography is the initial imaging modality of choice, which stratifies stenosis into mild (<50%), moderate (50-69%), and severe (>70%) 1, 3, 4
• If stenosis is >70%, additional imaging such as MRA or CTA of the neck may be considered for potential surgical intervention, as recommended by the European Society of Cardiology 1, 3, 8

Important Clinical Considerations

• Caution must be exercised when evaluating patients with extremely severe stenosis or multivessel involvement, as Doppler can overestimate stenosis with contralateral disease or underestimate critical high-grade stenosis, according to the American College of Radiology 1, 3
• MRI of the head is not recommended in the initial workup for asymptomatic patients with carotid bruit but may be useful later to evaluate for sequelae such as clinically silent strokes, as suggested by the American College of Radiology 1, 2

Management Based on Findings

• Asymptomatic patients with hemodynamically significant stenosis (>70%) might warrant surgical intervention, according to the American College of Radiology 1, 3
• Patients with carotid bruits should be evaluated for other manifestations of atherosclerotic disease, as they are at increased risk of cardiac events, as recommended by the American Heart Association 9

Common Pitfalls to Avoid

• Avoid routine screening with carotid duplex ultrasonography in asymptomatic patients who have no clinical manifestations of or risk factors for atherosclerosis, as suggested by the American Heart Association 6, 7
• Do not order MRI or CT perfusion studies as initial tests in the evaluation of asymptomatic carotid bruits, according to the American College of Radiology 1, 2, 3