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Original research
Focal middle cerebral artery ischemia in rats via a transfemoral approach using a custom designed microwire
  1. Afshin A Divani1,2,3,
  2. Ricky Chow3,4,
  3. Homayoun Sadeghi-Bazargani5,6,
  4. Amanda J Murphy1,7,
  5. Jessica A Nordberg1,
  6. Julian V Tokarev1,7,
  7. Mario Hevesi1,7,
  8. Xiao Wang8,
  9. Xiao-Hong Zhu8,
  10. Tommy Acompanado4,
  11. Peter A Edwards4,
  12. Yi Zhang8,
  13. Wei Chen8
  1. 1Department of Neurology, University of Minnesota, Minneapolis, Minnesota, USA
  2. 2Department of Neurological Surgery, University of Minnesota, Minneapolis, Minnesota, USA
  3. 3Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minnesota, USA
  4. 4Lake Region Medical, Chaska, Minnesota, USA
  5. 5Neurosciences Research Center, Tabriz University of Medical Sciences, Iran
  6. 6Department of Public Health Sciences, Karolinska Institute, Stockholm, Sweden
  7. 7Medical School, University of Minnesota, Minneapolis, Minnesota, USA
  8. 8Department of Radiology, Center for Magnetic Imaging Research, University of Minnesota, Minneapolis, Minnesota, USA
  1. Correspondence to Dr AA Divani, University of Minnesota, Department of Neurology, MMC 295, 420 Delaware Street SE, Minneapolis, MN 55455, USA; adivani{at}gmail.com

Abstract

Objectives The aim of this study was to develop a reliable and repeatable method of inducing focal middle cerebral artery occlusion (MCAo) in rats without ligation of the external carotid artery (ECA), while reducing the risk of subarachnoid hemorrhage.

Methods We prototyped microwires with different diameters (0.0120 inch, 0.0115 inch, 0.0110 inch), materials, and construction methods (coil-on-core, extruded polymer jacket-on-core). Under fluoroscopic guidance and using femoral artery access, the microwires were navigated into the internal carotid artery of male Wistar rats (n=50, weight 376±64 g) to induce MCAo for 1 or 2 h. We performed neurological assessments at baseline, and at 3, 24, 72, and 168 h after MCAo. MRI measurements were performed on a 9.4 T scanner at 1 and 7 days post-injury.

Results The 0.0115 inch microwire with polymer jacket-on-core provided the most successful outcome. At 1 and 7 days post-injury, we observed similar infarction volumes for 1 and 2 h MCAo in the MRI study. Infarcted lesion volumes in both MCAo groups were significantly reduced at 7 days compared with 1 day post-injury. The trend in longitudinal changes for the scores of different neurological assessments was confirmed to be significant after the injury, but both groups showed a similar trend of neurological deficits over the course of the study.

Conclusions We have developed a reliable and repeatable MCAo method in rats, allowing for precise occlusion of the MCA under direct fluoroscopic visualization without alteration of the cerebral hemodynamics associated with ECA ligation. The custom designed microwire can also be sized for targeted focal ischemia in larger animals.

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