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Rapid Doppler screening test for internal carotid disease.
Australian and New Zealand Journal of Medicine
|August 1, 1986
Summary
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.