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Doppler sonography in basilar artery occlusion
Insights
Directional continuous-wave Doppler sonography effectively diagnoses basilar artery occlusion. This non-invasive technique aids in identifying obstructions in the vertebro-basilar system, particularly complete occlusions of distal vertebral or proximal basilar arteries.
Area of Science:
- Neurology
- Vascular Imaging
- Diagnostic Sonography
Background:
- Vertebro-basilar system occlusive diseases pose significant diagnostic challenges.
- Accurate and timely diagnosis is crucial for patient management and outcomes.
Purpose of the Study:
- To establish criteria for diagnosing basilar artery occlusion or stenosis using directional continuous-wave Doppler sonography.
- To evaluate the efficacy of Doppler sonography compared to angiography in detecting these conditions.
Main Methods:
- Investigated 6,972 patients using directional continuous-wave Doppler sonography.
- Correlated sonographic findings with 1,071 retrograde brachial angiograms.
- Defined sonographic criteria including bilateral silence or absent diastolic flow in vertebral arteries.
Main Results:
- Sonography suspected obstruction in nine cases, confirmed by angiography as near or complete occlusion.
- Detected stenoses <80% lumen reduction were not identifiable sonographically.
- Angiography identified two additional basilar artery occlusions missed by sonography due to collateral circulation or specific occlusion patterns.
Conclusions:
- Directional continuous-wave Doppler sonography is highly useful for diagnosing near or complete occlusions of distal vertebral arteries or the proximal basilar artery.
- Sonography is a valuable non-invasive tool for evaluating the vertebro-basilar system.
- Limitations exist for detecting subtle stenoses or occlusions with extensive collateralization.
Abstract:
We have investigated 6,972 patients with directional continuous-wave Doppler sonography within the last three and a half years, and have derived criteria for the sonographic diagnosis of basilar artery occlusion or tight stenosis in conjunction with 1,071 retrograde brachial angiograms. By sonographic patterns, we have suspected obstruction of the basilar artery or of both distal vertebral arteries in nine cases. Either bilateral sonographic silence or the absence of a diastolic flow component of the vertebral arteries served as criteria in the sonographic evaluation. Angiography of the vertebro-basilar system, performed in eight cases, showed near or complete occlusion in the distal vertebrals or in the proximal basilar artery. Degrees of stenosis less than an 80 percent reduction in lumen diameter could not be detected sonographically. Two further basilar artery occlusions were detected by means of angiography despite negative Doppler sonography: one of these patients showed an extensive collateral circulation between the posterior inferior and the superior cerebellar arteries, and one patient had an occlusion only of the middle and rostral thirds of the basilar artery, the proximal third and the anterior inferior cerebellar arteries being widely patent. Thus, we believe that directional CW Doppler sonography is very useful in the diagnosis of near or complete occlusion of both distal vertebral arteries or of the proximal basilar artery.