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Cerebral blood flow after carotid occlusion and extracranial-intracranial bypass
Insights
Patients with internal carotid artery occlusion show reduced blood flow in the affected hemisphere. Surgery improved blood flow, reducing asymmetry, while non-surgical management led to persistent asymmetry.
Area of Science:
- Neurology
- Neurosurgery
- Vascular Surgery
Background:
- Internal carotid artery occlusion significantly impacts regional cerebral blood flow (rCBF).
- Hemispheric blood flow asymmetry is a consequence of unilateral internal carotid artery occlusion.
Purpose of the Study:
- To evaluate the impact of extracranial-intracranial bypass surgery on regional cerebral blood flow (rCBF) in patients with internal carotid artery occlusion.
- To compare the long-term effects of surgical versus non-surgical management on hemispheric rCBF asymmetry.
Main Methods:
- Retrospective analysis of eleven patients with unilateral internal carotid artery occlusion.
- Measurement of regional cerebral blood flow (rCBF) in both hemispheres before and after intervention.
- Comparison of outcomes between six patients managed non-surgically and five patients who underwent extracranial-intracranial bypass.
Main Results:
- Non-surgical management resulted in increased rCBF bilaterally but maintained significant hemispheric asymmetry over 2-5 years.
- Extracranial-intracranial bypass led to increased rCBF in the affected hemisphere, with a less pronounced asymmetry compared to the non-operated group.
Conclusions:
- Extracranial-intracranial bypass surgery effectively improves regional cerebral blood flow in the affected hemisphere following internal carotid artery occlusion.
- Surgical intervention significantly reduces, but does not eliminate, the persistent hemispheric blood flow asymmetry observed in non-surgically treated patients.
Abstract:
Eleven patients with occlusion of one internal carotid artery showed marked reduction of regional cerebral blood flow (rCBF) through the hemisphere on the affected side with high rCBF on the opposite side. Six of the patients had no surgery, during follow-up of 2 to 5 years. rCBF increased on both sides leaving a persisting asymmetry of rCBF. Five patients had extracranial-intracranial bypass; rCBF increased on the affected side but not on the opposite side. Asymmetry of rCBF between the hemispheres remained but was much less than in the non-operated group.