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Clinical implications of the Doppler cerebrovascular examination: a correlation with angiography
Insights
Directional Doppler ultrasound is effective for severe carotid artery stenosis but misses many clinically significant lesions. Relying solely on Doppler findings may lead to overlooking crucial carotid artery disease requiring angiography.
Area of Science:
- Neurology
- Vascular Surgery
- Medical Imaging
Background:
- Cerebrovascular disease poses significant health risks.
- Accurate detection of carotid artery stenosis is crucial for patient management.
- Noninvasive imaging techniques are vital for initial patient evaluation.
Purpose of the Study:
- To compare the diagnostic accuracy of directional Doppler ultrasound with angiography in evaluating internal carotid arteries.
- To assess the utility of Doppler ultrasound in identifying clinically significant carotid artery lesions.
- To determine if Doppler findings alone should guide decisions for angiography.
Main Methods:
- A comparative study involving 152 internal carotid arteries.
- Directional Doppler ultrasound examination.
- Angiographical findings as the gold standard.
Main Results:
- Doppler ultrasound correctly identified 95% of arteries with >75% stenosis.
- Only 4 of 63 arteries with lesser stenosis were detected by Doppler.
- No false-positive Doppler results were observed.
- Relying solely on Doppler would have missed 60% of clinically significant carotid lesions.
Conclusions:
- Directional Doppler ultrasound is highly sensitive for severe carotid stenosis but lacks sensitivity for milder degrees.
- The technique is limited in detecting non-hemodynamically significant lesions that can be embolic sources.
- Doppler ultrasound should not be the sole determinant for proceeding with angiography in routine cerebrovascular evaluations.
Abstract:
A directional Doppler ultrasound cerebrovascular examination was compared with angiographical findings of 152 internal carotid arteries. The Doppler examination was abnormal in 36 of 38 (95%) arteries with occlusion or stenosis greater than 75%. Of 63 arteries with lesser degrees of stenosis, the Doppler examination identified only four. There were no false-positive Doppler examinations. If the decision to perform angiography had been predicated exclusively on the presence of abnormal Doppler findings, 61 of 101 (60%) carotid lesions of potential clinical significance would have been overlooked. While the Doppler ultrasound cerebrovascular examinations is the most useful noninvasive technique available for the evaluation of certain specific categories of patients with cerebrovascular disease, the technique is based on hemodynamic alterations of pressure and flow, and cannot be expected to identify the relatively large number of non-hemodynamically significant carotid lesions that are still clinically significant as sources of emboli. This paper illustrates that in the routine evaluation of patients with symptomatic cerebrovascular disease, the Doppler examination should not play a part in the decision to proceed with angiography.