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Temporal thresholds of reperfusion in the middle cerebral artery occlusion model in rats
T Katsumata1, Y Katayama, A Terashi
1Second Department of Internal Medicine, Nippon Medical School, Tokyo, Japan.
Abstract:
In this study, the middle cerebral artery (MCA) of adult male Sprague-Dawley rats was occluded by the modified Koizumi method to determine the temporal thresholds of reperfusion for the treatment of cerebral embolism. Regional cerebral blood flow (rCBF) and pathological findings were measured at 1 and 2 h of ischemia and after 24 h and 7 days of reperfusion following 1 or 2 h of ischemia. rCBF was decreased the most (less than 10% of control CBF) in the parietal cortex (Pcor) and the lateral caudoputamen (Lcp) at both 1 and 2 h of ischemia. There was no significant difference in rCBF in these areas between the 2 ischemic groups. The 2 h ischemia group clearly showed infarction in the area perfused by the middle cerebral artery (including the Pcor and Lcp) after 24 h and 7 days of reperfusion, while the 1 h ischemia group showed only slight infarction. These findings suggest that temporal thresholds of reperfusion in this model exist between 1 and 2 h of ischemia, and that rCBF levels during ischemia and the duration of ischemia are the most important factors in producing brain infarction.
Insights
Determining reperfusion time for stroke treatment is crucial. This study in rats found that between 1 and 2 hours of ischemia, brain damage significantly increases, highlighting the importance of timely intervention for cerebral embolism.
Area of Science:
- Neuroscience
- Cerebrovascular Research
- Ischemia-Reperfusion Studies
Background:
- Cerebral embolism poses a significant risk for stroke.
- Understanding the time-sensitive nature of reperfusion therapy is critical for effective treatment.
- Animal models are essential for investigating the pathophysiology of ischemic stroke.
Purpose of the Study:
- To determine the temporal thresholds for reperfusion therapy in a rat model of middle cerebral artery occlusion.
- To investigate the relationship between ischemic duration and subsequent brain infarction.
- To assess the impact of regional cerebral blood flow (rCBF) on infarction severity.
Main Methods:
- Adult male Sprague-Dawley rats underwent middle cerebral artery (MCA) occlusion using the modified Koizumi method.
- Regional cerebral blood flow (rCBF) was measured.
- Pathological findings, including infarction, were assessed after 1 or 2 hours of ischemia followed by 24 hours and 7 days of reperfusion.
Main Results:
- Ischemia significantly reduced rCBF in the parietal cortex (Pcor) and lateral caudoputamen (Lcp).
- The 2-hour ischemia group exhibited clear infarction in MCA-perfused areas, unlike the 1-hour group which showed only slight infarction.
- No significant difference in rCBF was observed between the 1-hour and 2-hour ischemia groups.
Conclusions:
- Temporal thresholds for reperfusion in this cerebral embolism model lie between 1 and 2 hours of ischemia.
- Both the duration of ischemia and the level of rCBF during ischemia are critical determinants of brain infarction.
- Prompt reperfusion is vital to mitigate brain damage following ischemic events.