Abstract
Background
Animal models of stroke play a crucial role in determining the pathophysiology of stroke progression and assessment of any new therapeutic approaches. Transient middle cerebral artery occlusion (tMCAo) in rodent models are the most common site-specific type of ischemia because of their relevance to the clinical setting. Compared with the intraluminal filament technique for inducing tMCAo, the transfemoral approach using endovascular wires is relatively a new technique
Methods
Here we present the use of commercially available wires used for neuro-endovascular surgical procedures to induce tMCAo in rats via a transfemoral approach. We used male Wistar rats in four groups to assess the effect of occlusion time (1 vs. 2 hours) and the wire type (PT2 TM 0.014″ vs. TransendTM EX, 0.014″, Boston Scientific, MA, USA). Infarct volume, edema, neurological deficits, and pro-inflammatory/anti-inflammatory blood biomarkers were used as outcome measures.
Results
We observed a significant effect of the wire type on the infarct volume (p value = 0.0096) where infarcts were slightly larger in the PT2 wiregroups. However, the occlusion time had no significant effect on infarct volume, even though the interaction between wire-type * occlusion-time was significant (p value = 0.024). Also, the amount of edema and blood pro-inflammatory/anti-inflammatory biomarkers were not statistically different among the wire-type and occlusion-time groups.
Conclusions
The choice of appropriate endovascular wire should probably be the focus of the study design instead of the occlusion time when planning an experiment. The transfemoral approach using endovascular wires for inducing tMCAo in rats provides a more consistent outcome with fewer complications compared with suture filament models.
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Acknowledgements
The authors express their gratitude toward Charles River Laboratories for providing gratis rats used in this study. Further, we thank Apameh Salari, MD, for her help with performing some of the experiments.
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AAD designed the study, performed the experiments, interpreted the results, prepared the manuscript the subsequent revisions, and supervise the project. TDF, MDN, KSS and MF contributed to the study design, manuscript preparation, and subsequent revisions. PS designed and performed statistical analysis, contributed to manuscript preparation, and subsequent revisions. AJ and MJ performed the experiments and contributed to data collection.
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Dr. Salazar is an employee of Vital Images (Minnetonka, MN, USA).
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The study was approved by and conducted according to the guidelines set by the IACUC at the University of Minnesota. The data are reported based on the recommendations from “Improving bioscience research reporting: the ARRIVE guidelines for reporting animal research”.
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Divani, A.A., Farr, T.D., Di Napoli, M. et al. Transfemoral Approach to Induce Transient Middle Cerebral Artery Occlusion in Rats: The Use of Commercially Available Endovascular Wires. Neurocrit Care 32, 575–585 (2020). https://doi.org/10.1007/s12028-019-00791-8
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DOI: https://doi.org/10.1007/s12028-019-00791-8