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Clinicopathological observations in middle cerebral artery occlusion in the cat
S Komatsumoto1, J H Greenberg, W F Hickey
1Department of Pathology, University of Pennsylvania, Philadelphia 19104, USA.
Abstract:
This study was designed to investigate the relationships among neurological deficits, changes in the electroencephalogram (EEG) and morphological damage over a one week period following temporary occlusion (2 h) of the middle cerebral artery (MCA) in the cat. The animals were grouped into mild, moderate, and severe stroke based on the EEG alterations produced 30 min after the MCA occlusion. All three grades of stroke showed a precipitous fall in mean EEG amplitude followed by a recovery during a 4 h recirculation period. Over the subsequent 7 days there was a gradual secondary depression in the EEG amplitude. Post-operatively, a secondary fall in EEG amplitude in the contralateral hemisphere was also noted in all stroke groups corresponding to the clinical phenomenon of 'diaschisis'. The overall neurological score differed significantly among the severe, moderate, and mild stroke groups. The neurological deficits on the 7th day were highly correlated with the degree of morphological damage. Additionally, the reduction of EEG was also well correlated with the pathological data. This stroke model in the cat has provided important data concerning the restitution of brain function following chronic focal ischaemia.
Insights
This study reveals that neurological deficits after a stroke in cats strongly correlate with brain damage and electroencephalogram (EEG) changes. Recovery showed a secondary EEG depression, indicating brain function restitution after focal ischemia.
Area of Science:
- Neuroscience
- Pathology
Background:
- Focal cerebral ischemia, such as middle cerebral artery (MCA) occlusion, is a significant cause of neurological deficits.
- Understanding the relationship between brain damage, electroencephalogram (EEG) activity, and functional recovery is crucial for stroke research.
Purpose of the Study:
- To investigate the correlation between neurological deficits, EEG alterations, and morphological brain damage in a feline model of temporary MCA occlusion.
- To characterize the time course of EEG changes and neurological impairments following focal cerebral ischemia.
Main Methods:
- A transient 2-hour middle cerebral artery occlusion model was established in cats.
- Animals were categorized into mild, moderate, and severe stroke groups based on EEG changes 30 minutes post-occlusion.
- Neurological scores and EEG amplitudes were monitored over a 7-day period, followed by pathological assessment.
Main Results:
- All stroke groups exhibited an initial drop in EEG amplitude, followed by recovery and a subsequent secondary depression over 7 days.
- A phenomenon termed 'diaschisis' was observed, characterized by a secondary EEG amplitude decrease in the contralateral hemisphere.
- Significant differences in neurological scores were observed across stroke severity groups, with deficits correlating strongly with morphological damage and EEG reduction.
Conclusions:
- The feline stroke model effectively demonstrates the relationship between neurological deficits, morphological damage, and EEG changes.
- The study provides insights into the restitution of brain function following chronic focal ischemia, highlighting the significance of EEG monitoring and neurological assessment.