Reliability of Doppler Scanning of the Carotid Bifurcation: Angiographic Correlation

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Abstract
The results of continuous wave Doppler scanning of 96 common carotid arteries and their immediate branches were compared with those of selective angiography. The overall accuracy of the Doppler technique for the assessment of the common, internal and external carotid arteries was 98, 81 and 86%, respectively, with a sensitivity of 60, 70 and 54%, and a specificity of 100, 93 and 96%. When stenoses of 50% were considered hemodynamically insignificant, the overall accuracy of the assessment of the common, internal and external carotid arteries rose to 100, 93 and 93%, but the sensitivity was only 100, 83 and 53%, and the specificity was 100, 96 and 96%. This modality was not useful in the detection of intimal ulcers and plaques and the degree of stenosis could not be accurately graded. Contrast angiography remains imperative prior to surgery.

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