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Updated: Jul 11, 2026
Focal Cerebral Ischemia Model by Endovascular Suture Occlusion of the Middle Cerebral Artery in the Rat
Published on: February 5, 2011
Reproducibility of cerebral cortical infarction in the wistar rat after middle cerebral artery occlusion
Abstract:
Although middle cerebral artery (MCA) occlusion in the rat is often used to study focal cerebral ischemia, the model of ischemia affects the size and reproducibility of infarction. The purpose of this experiment was to methodically examine different preparations to determine the optimum focal cerebral ischemia model to produce a reproducible severe ischemic injury. Eighty-two Wistar rats underwent either 1 hour, 3 hour, or permanent MCA occlusion combined with no, unilateral, or bilateral common carotid artery artery (CCA) occlusion. Three days after ischemia, the animals were prepared for tetrazolium chloride assessment of infarction size. One-hour MCA occlusion produced a coefficient of variation (CV) of 200% with an infarction volume of 20.3+/-10.5 mm(3). Adding unilateral or bilateral CCA occlusion resulted in a CV of 134% and 101%, respectively. Three-hour MCA occlusion combined with bilateral CCA occlusion decreased the CV to 58% with a cortical infarction volume of 82.6+/-12.1 mm(3), P<05, compared with 1-hour MCA occlusion with or without CCA occlusion. Permanent MCA occlusion combined with 3 hours of bilateral CCA occlusion resulted in a CV of 47% with a cortical infarction volume of 89.6+/-16.0 mm(3). These results indicate that 3-hour MCA occlusion combined with bilateral CCA occlusion provide consistently a large infarction volume after temporary focal cerebral ischemia.
Insights
The optimal rat model for studying focal cerebral ischemia involves 3-hour middle cerebral artery (MCA) occlusion with bilateral common carotid artery (CCA) occlusion, yielding reproducible severe ischemic injury.
Area of Science:
- Neuroscience
- Ischemic Stroke Research
- Animal Models of Disease
Background:
- Middle cerebral artery (MCA) occlusion in rats is a common model for focal cerebral ischemia.
- Variability in infarction size and reproducibility is a significant challenge in current models.
- Optimizing the model is crucial for reliable research into ischemic stroke mechanisms and treatments.
Purpose of the Study:
- To systematically evaluate different occlusion preparations for middle cerebral artery (MCA) occlusion in rats.
- To identify the optimal focal cerebral ischemia model that produces a reproducible and severe ischemic injury.
- To determine the best combination of MCA and common carotid artery (CCA) occlusion for consistent infarction.
Main Methods:
- Eighty-two Wistar rats were subjected to varying durations of MCA occlusion (1-hour, 3-hour, permanent).
- Combinations included no, unilateral, or bilateral common carotid artery (CCA) occlusion.
- Infarction size was assessed using tetrazolium chloride staining three days post-ischemia.
Main Results:
- One-hour MCA occlusion showed high variability (CV 200%).
- Adding CCA occlusion improved reproducibility for 1-hour MCA occlusion (CV 134-101%).
- Three-hour MCA occlusion with bilateral CCA occlusion (CV 58%) and permanent MCA occlusion with 3-hour bilateral CCA occlusion (CV 47%) provided the most reproducible and largest infarction volumes.
Conclusions:
- Three-hour MCA occlusion combined with bilateral CCA occlusion offers a highly reproducible method for inducing severe focal cerebral ischemia in rats.
- This optimized model is suitable for studying the effects of temporary focal cerebral ischemia.
- The findings provide a standardized approach for future research in stroke models.
