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Middle cerebral artery perfusion pressure in cerebrovascular occlusive disease
Insights
The middle cerebral artery pressure/mean systemic blood pressure ratio correlates with cerebral vascular occlusive disease severity. Lower ratios indicate more severe disease and may predict neurologic improvement after extracranial-intracranial arterial bypass surgery.
Area of Science:
- Neurology
- Vascular Surgery
- Medical Imaging
Background:
- Cerebrovascular disease often involves occlusion of major cranial vessels.
- Neurological deficits are common in patients with cerebrovascular disease.
- Extracranial-intracranial arterial bypass (EIAB) is a surgical option for certain cerebrovascular conditions.
Purpose of the Study:
- To investigate the relationship between the middle cerebral artery pressure/mean systemic blood pressure (MCAP/MSBP) ratio and the severity of angiographically confirmed cerebral vascular occlusive disease.
- To determine if the MCAP/MSBP ratio could predict neurological outcomes following EIAB.
- To explore the correlation between MCAP/MSBP and graft perfusion in the middle cerebral artery territory.
Main Methods:
- Measurement of the MCAP/MSBP ratio in 76 patients undergoing EIAB.
- Classification of patients into groups based on preoperative angiographic findings of cerebral vascular occlusive disease.
- Analysis of the correlation between MCAP/MSBP ratios and angiographic severity, preoperative neurological deficits, and postoperative graft perfusion.
Main Results:
- A significant inverse correlation was observed between increasing severity of cerebral vascular occlusive disease and lower MCAP/MSBP ratios.
- Patients with preoperative neurological deficits who showed postoperative improvement had significantly lower mean MCAP/MSBP ratios compared to those who did not improve.
- Postoperative perfusion of the middle cerebral artery territory via the bypass graft demonstrated an inverse linear relationship with the MCAP/MSBP ratio.
Conclusions:
- The MCAP/MSBP ratio is a valuable indicator of cerebral vascular occlusive disease severity.
- A lower MCAP/MSBP ratio may suggest a higher risk of hypoperfusion and potentially predict a better response to EIAB in select patients.
- Hypoperfusion resulting from major cranial vessel occlusion plays a critical role in the development of neurological deficits in cerebrovascular disease.
Abstract:
We measured the MCAP (middle cerebral artery pressure)/MSBP (mean systemic blood pressure) ratio in 76 patients who underwent an EIAB (extracranial-intracranial arterial bypass). Patients were divided into groups on the basis of angiographic findings. We found a definite correlation between increasing angiographic cerebral vascular occlusive disease and lower MCAP/MSBP ratios. Six of 32 patients with a preoperative neurologic deficit demonstrated mild but definite postoperative neurologic improvement. The mean MCAP/MSBP ratio in these six patients was significantly lower than that for the remainder of this group (p less than .05). Finally, postoperative filling of the middle cerebral artery territory through the graft was found to correlate in an inverse linear relationship with MCAP/MSBP. Evidence is presented that hypoperfusion produced by occlusion of major cranial vessels plays an important role in temporary and permanent neurological deficits seen in patients with cerebrovascular disease.