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Duration dependent post-ischemic hypothermia alleviates cortical damage after transient middle cerebral artery
Abstract:
We investigated the effect of post-ischemic 30 degrees C hypothermia on transient middle cerebral artery (MCA) occlusion in the rat. Male Wistar rats (n = 27) were subjected MCA occlusion for 2 h by inserting a nylon filament into the internal carotid artery. Three groups of animals were studied: 1) normothermic ischemia and normothermic reperfusion (n = 13), 2) normothermic ischemia and 1 h of hypothermic reperfusion (n = 6), 3) normothermic ischemia and 3 h of hypothermic reperfusion (n = 6); monitoring of cerebral temperatures were performed on two additional rats. The animals were sacrificed after one week, and coronal sections were obtained and stained with hematoxylin and eosin (H/E) for histopathological examination and determination of infarct volume. The data indicate that both normothermic reperfusion and 1 h hypothermic reperfusion groups exhibited similar infarct volumes in the cortex and the basal ganglia, respectively (P > 0.1). The 3 h post-ischemic hypothermia group revealed a significant decrease in infarct volume in the cortex compared to the normothermic group (P < 0.05). However, the infarct volume of the basal ganglia was not significantly lessened by the 3 h post-ischemic hypothermia. Thus 3 h post-ischemic hypothermia provides preferential reduction of cell damage in the cortex, from 2 h of MCA occlusion in the rat.
Insights
Post-ischemic hypothermia significantly reduced cortical infarcts after middle cerebral artery occlusion in rats. Three hours of hypothermia offered preferential neuroprotection in the cortex, not the basal ganglia.
Area of Science:
- Neuroscience
- Cerebrovascular Research
- Ischemic Stroke Models
Background:
- Middle cerebral artery (MCA) occlusion is a common model for studying ischemic stroke.
- Hypothermia is a potential neuroprotective strategy following ischemic events.
Purpose of the Study:
- To evaluate the neuroprotective effects of post-ischemic hypothermia on transient MCA occlusion in a rat model.
- To determine the impact of hypothermia duration on infarct volume in different brain regions.
Main Methods:
- Male Wistar rats underwent 2-hour transient MCA occlusion.
- Three experimental groups received normothermic reperfusion, 1-hour hypothermic reperfusion, or 3-hour hypothermic reperfusion.
- Infarct volumes were assessed via histopathological examination (H/E staining) after one week.
Main Results:
- No significant difference in infarct volume between normothermic and 1-hour hypothermic reperfusion groups.
- 3-hour post-ischemic hypothermia significantly reduced cortical infarct volume (P < 0.05).
- Hypothermia did not significantly reduce infarct volume in the basal ganglia.
Conclusions:
- 3-hour post-ischemic hypothermia demonstrates preferential neuroprotection in the cortex following 2-hour MCA occlusion in rats.
- The duration of hypothermia is critical for achieving regional neuroprotection in ischemic stroke models.