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Intracranial pressure changes following middle cerebral artery occlusion in rats
Z Kotwica1, H G Hårdemark, L Persson
1Department of Neurosurgery, Medical Academy of Lódź, Poland.
Abstract:
Prolonged recording of intracranial pressure (ICP) was performed on rats subjected to middle cerebral artery (MCA) occlusion. ICP was repeatedly recorded before and after occlusion of the vessel via a narrow catheter placed in the cisterna magna. MCA occlusion was followed by an increase in ICP, and a pressure peak occurred after 12-24 h in all animals. Subsequently, essentially two patterns of ICP changes were observed. These seemed to be related to the severity of neurological deficits and extension of the infarct area. In the most severely affected animals, raised ICP was noted throughout the 1st week after MCA occlusion; in rats with reversible neurological deficits, ICP returned to normal values after the first peak at 12-24 h. The present investigation shows that prolonged ICP recording is feasible in MCA-occluded rats. The MCA occlusion model in rats is well characterized. Thus, ICP registration can be used in conjunction with other methods for evaluating treatment against increased ICP.
Insights
This study demonstrates that prolonged intracranial pressure (ICP) monitoring is feasible in rats with middle cerebral artery (MCA) occlusion. ICP patterns correlate with neurological deficits and infarct size, offering insights into stroke recovery.
Area of Science:
- Neuroscience
- Cerebrovascular Research
- Surgical Models
Background:
- Middle cerebral artery (MCA) occlusion in rats is a common model for ischemic stroke.
- Intracranial pressure (ICP) changes are critical in stroke pathophysiology.
- Understanding ICP dynamics is vital for developing effective stroke treatments.
Purpose of the Study:
- To assess the feasibility of prolonged intracranial pressure (ICP) recording in rats undergoing middle cerebral artery (MCA) occlusion.
- To investigate the relationship between ICP patterns, neurological deficits, and infarct size post-MCA occlusion.
Main Methods:
- Rats underwent middle cerebral artery (MCA) occlusion.
- Intracranial pressure (ICP) was continuously monitored via a cisterna magna catheter before and after MCA occlusion.
- Neurological deficits and infarct area were assessed.
Main Results:
- MCA occlusion led to an initial increase in ICP, peaking at 12-24 hours.
- Two distinct ICP patterns emerged: sustained elevation in severe cases and normalization after the initial peak in milder cases.
- ICP patterns correlated with the severity of neurological deficits and infarct extension.
Conclusions:
- Prolonged ICP monitoring is a viable technique in the rat MCA occlusion model.
- ICP dynamics provide valuable prognostic information regarding stroke severity and outcome.
- This method can aid in evaluating therapeutic interventions targeting elevated ICP in stroke.