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Rapid Doppler screening test for internal carotid disease

B I Seneviratne, A Hughes, L S Jayasinghe

    Australian and New Zealand Journal of Medicine
    |August 1, 1986
    PubMed

    Insights

    A new Doppler test accurately identifies significant internal carotid artery stenosis, a key stroke precursor. This non-invasive method is fast, inexpensive, and ideal for screening potential stroke patients.

    Area of Science:

    • Vascular Medicine
    • Neurology
    • Diagnostic Imaging

    Background:

    • Stroke is often caused by hemodynamically significant internal carotid artery lesions (over 50% stenosis or occlusion).
    • Minor carotid lesions are less likely to be stroke precursors.
    • Accurate non-invasive screening for significant stenosis is crucial for stroke prevention.

    Purpose of the Study:

    • To evaluate a combined periorbital and direct audible Doppler test for identifying hemodynamically significant internal carotid artery lesions.
    • To compare the Doppler test's accuracy against conventional biplane angiography.
    • To assess the test's suitability as a non-invasive screening tool.

    Main Methods:

    • A Doppler test was performed on 134 internal carotids from 67 patients.
    • Results were compared with conventional biplane angiography.
    • Sensitivity, specificity, and predictive values were calculated.

    Main Results:

    • The Doppler test demonstrated 100% sensitivity and 91% positive predictive value for hemodynamically significant lesions.
    • Negative predictive value for normal or <50% stenosis was 100%.
    • Carotid bruits were unreliable indicators, heard in only 25% of significant stenoses and 60% of minor lesions.

    Conclusions:

    • The combined Doppler test is a highly sensitive and specific non-invasive method for detecting significant internal carotid artery stenosis.
    • The test is portable, inexpensive, quick (<12 minutes), and minimally invasive, making it an ideal screening tool.
    • This approach can aid in identifying patients at high risk for stroke due to carotid artery disease.

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