Abstract
Carotid artery disease is an important factor in the aetiology of stroke and cerebrovascular insufficiency. Angiography remains the definitive technique for the investigation of the carotid arteries, but the risk and expense involved has stimulated research into suitable non-invasive techniques. A comparison between a velocity-sensitive, colour-coded Doppler principle ultrasound flowmeter (Echoflow) and conventional angiography was conducted on 52 patients (101 arteries) investigated at Royal Perth Hospital over a 16-month period. An acceptable correlation was found in 78% of cases. Echoflow scanning proved to be particularly accurate in assessing normal arteries. Our results support the use of Echoflow as a first line of investigation, and in aiding the selection of cases requiring further study, although we caution against routine angiography in all patients with positive Echoflow scan results.
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