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Transcranial Doppler sonography: collateral pathways in internal carotid artery obstructions
K Rosenkranz1, R Langer, R Felix
1Department of Radiology, University Hospital Rudolf Virchow-Charlottenburg (UKTV-C), Free University of Berlin, Germany.
Angiology
|October 1, 1991
Summary
This study on internal carotid artery (ICA) obstructions found that reduced pulsatility index in the middle cerebral artery (MCA) is a sensitive indicator of hemodynamic changes, more so than flow velocity.
Area of Science:
- Neurovascular imaging
- Cerebrovascular disease
Background:
- Internal carotid artery (ICA) stenosis and occlusion can lead to reduced cerebral blood flow.
- Understanding intracranial collateralization is crucial for assessing hemodynamic compromise.
Purpose of the Study:
- To evaluate intracranial collateralization in patients with extracranial ICA obstructions.
- To determine the sensitivity of Doppler parameters in detecting hemodynamic effects of ICA disease.
Main Methods:
- Fifty-four patients with ICA stenosis/occlusion underwent extracranial duplex and transcranial Doppler.
- Intravenous digital subtraction angiography (IVDSA) was used for initial diagnosis.
- Comparison with 200 healthy volunteers as a control group.
Main Results:
- Intracranial collateralization was observed in 32 patients with ICA stenoses >80% or occlusions.
- Collateral supply involved anterior cerebral artery (ACA) and/or posterior cerebral artery (PCA).
- Reduced pulsatility index in the ipsilateral middle cerebral artery (MCA) was more sensitive than time-mean flow velocity in detecting hemodynamic effects.
Conclusions:
- Doppler ultrasound can effectively assess collateral circulation in ICA obstructions.
- Pulsatility index in the MCA is a more sensitive hemodynamic indicator of ICA disease than mean flow velocity.