Five hundred fifty-nine patients were evaluted for carotid artery disease in the Blood Flow Laboratory by the following direct and indirect noninvasive methods: 1. Periorbital doppler examination; 2. Ocular pneumoplethysmography (Gee); 3. Pulsed doppler ultrasonic arteriography; and 4. Sound spectral analysis with a pulsed doppler.
Carotid arteriograms were available for comparison with one hundred fifty- seven vessels (80 patients). Sensitivity, specificity and overall accuracy was established for each noninvasive modality by correlation with the angiographic findings.
For detection of stenoses greater than 50% by diameter reduction, sensitivity was 98%. Sound spectral analysis and ultrasonic arteriography were found to yield a higher sensitivity when compared to the other noninvasive methods in detecting stenoses of less than 50%. In our hands, disturbed spectral flow patterns do not always correlate with the degree of stenosis in non-hemodynamic lesions.
Our results indicate that proper patient selection for angiographic examina tion can be made through noninvasive screening.
