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Cerebral blood flow in relation to contralateral carotid disease, an MRA and TCD study
A J de Nie1, J D Blankensteijn, G H Visser
1Department of Surgery, Division of Vascular Surgery, Utrecht, PO Box 85500, NL-3508 GA, The Netherlands.
Insights
In severe internal carotid artery (ICA) stenosis, contralateral ICA disease significantly alters cerebral blood flow. Occlusion leads to substantial redistribution via anterior and posterior communicating arteries.
Area of Science:
- Neurology
- Vascular Surgery
- Medical Imaging
Background:
- Internal carotid artery (ICA) stenosis affects cerebral blood flow.
- Understanding collateral circulation is crucial for managing ICA disease.
Purpose of the Study:
- To investigate cerebral blood flow redistribution in severe ICA stenosis.
- To correlate flow patterns with contralateral ICA disease severity.
Main Methods:
- Sixty-six patients undergoing carotid endarterectomy (CEA) were grouped by contralateral ICA stenosis severity.
- Transcranial Doppler (TCD) and magnetic resonance angiography (MRA) were used for preoperative assessment.
Main Results:
- Reversed flow in contralateral anterior cerebral and ophthalmic arteries was observed in 75% of patients with ICA occlusion (Group IV).
- Group IV patients showed reduced middle cerebral artery flow velocity and increased ipsilateral ICA and basilar artery (BA) flow volumes.
- Total cerebral blood flow (ICAs + BA) remained unchanged.
Conclusions:
- Contralateral ICA disease severity dictates cerebral blood flow redistribution patterns.
- Significant posterior communicating pathway flow occurs with contralateral ICA occlusion.
Objective:
to describe redistribution of cerebral blood flow in patients with severe internal carotid artery (ICA) stenoses in relation to contralateral ICA disease.
Methods:
sixty-six patients scheduled for carotid endarterectomy (CEA) were grouped according to severity of contralateral stenosis (<30% [group I]; 30-69% [group II]; 70-99% [group III]; occlusion [group IV]. Transcranial Doppler (TCD) and magnetic resonance angiography (MRA) investigations were performed preoperatively.
Results:
TCD demonstrated a reversed flow in the contralateral anterior cerebral artery (A(1)segment) and ophthalmic artery in three-quarters of group IV patients (p <0.0001). Group IV patients also exhibited decreased blood flow velocity in the contralateral middle cerebral artery (p =0.001). MRA showed increased ipsilateral ICA and basilar artery (BA) blood flow volumes (Q-flows) in group IV patients when compared to the other groups (p <0.001). No changes in total Q-flow (ICAs+BA) were found.
Conclusions:
in patients considered for CEA, the severity of the contralateral ICA disease is an important determinant of the pattern of blood flow redistribution through the anterior communicating pathway and ophthalmic artery. Significant flow redistribution through the posterior communicating pathway occurs especially in patients with contralateral ICA occlusion.