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Updated: Aug 11, 2026
Embolic Middle Cerebral Artery Occlusion (MCAO) for Ischemic Stroke with Homologous Blood Clots in Rats
Published on: September 17, 2014
Selective MCA occlusion: a precise embolic stroke model
Vincent A Dinapoli1, Charles L Rosen, Tomoaki Nagamine
1Department of Neurosurgery, West Virginia University School of Medicine, Morgantown, 26506-9183, USA.
Abstract:
The present study describes a method for improving the precision and accuracy of clot placement within the middle cerebral artery (MCA) of rats, utilizing a micro-catheter and laser Doppler flowmetry. This technique reduces the size of clot needed to achieve stable occlusion with no failed embolizations and a low percentage of early recanalizations. Infarctions were consistent in both size and distribution within the MCA perfusion territory. Selective embolization in aged animals (n = 10) resulted in substantially larger infarctions than those seen in aged animals (n = 10) following non-selective embolization (P < 0.05), or young animals (n = 10) subjected to filamentous occlusion (P < 0.001). Clots were localized to the MCA by direct examination at 0, 60 and 120 min post-embolization (n = 14). All aged animals surviving 24h exhibited moderate to severe functional deficits, with selectively occluded animals having a higher mean score on the modified neurologic severity scale (P = 0.002). This model provides a highly reproducible method for embolization of the MCA and reliable reperfusion with rt-PA.
Insights
This study presents a precise method for inducing middle cerebral artery (MCA) occlusion in rats using micro-catheter technology. The improved technique ensures reproducible clot placement, leading to consistent stroke models for research.
Area of Science:
- Neuroscience
- Cerebrovascular Research
- Animal Models
Background:
- Accurate middle cerebral artery (MCA) occlusion is crucial for stroke research.
- Existing methods for inducing MCA occlusion in rodents have limitations in precision and reproducibility.
- Developing a reliable animal model for studying ischemic stroke is essential for therapeutic development.
Purpose of the Study:
- To describe an improved method for precise clot embolization in the rat MCA.
- To validate the reproducibility and accuracy of the developed embolization technique.
- To assess the resulting infarct characteristics and functional deficits in a rat stroke model.
Main Methods:
- Utilized a micro-catheter for precise clot delivery into the rat MCA.
- Employed laser Doppler flowmetry to monitor cerebral blood flow during embolization.
- Quantified infarct size and distribution, and assessed neurological deficits using the modified neurologic severity scale.
- Verified clot localization via direct examination at multiple time points post-embolization.
Main Results:
- Achieved stable MCA occlusion with reduced clot size, minimizing failed embolizations and early recanalization.
- Demonstrated consistent infarct size and distribution within the MCA perfusion territory.
- Selective embolization in aged rats produced significantly larger infarcts compared to non-selective embolization or filamentous occlusion in young rats.
- Aged animals with selective MCA occlusion exhibited severe functional deficits, with higher scores on the modified neurologic severity scale.
Conclusions:
- The described micro-catheter and laser Doppler flowmetry technique offers a highly reproducible method for MCA embolization in rats.
- This model reliably induces ischemic stroke with consistent infarcts and functional deficits, suitable for studying stroke pathophysiology and treatment.
- The model facilitates reliable reperfusion studies, including evaluation of recombinant tissue plasminogen activator (rt-PA).
