Effects of intermittent reperfusion during temporal focal ischemia

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  • 1 Neurosurgery Cerebrovascular Research, Mayo Clinic and Mayo Graduate School of Medicine, Rochester, Minnesota
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✓ There is controversy regarding the role of intermittent reperfusion employed as a cerebroprotective measure when temporary arterial occlusion is necessary during repair of difficult aneurysms. The intraluminal suture middle cerebral artery (MCA) occlusion technique was used in 23 Wistar rats under barbiturate anesthesia to induce 60, 90, or 120 minutes of uninterrupted MCA occlusion. The total infarcted areas obtained were compared to those occurring in 27 animals subjected to identical cumulative ischemic periods but with 5 minutes of reperfusion after every 10-minute ischemic period. The mean total infarcted areas in the groups with 60-minute (1.8 ± 0.89 sq mm), 90-minute (1.08 ± 1.02 sq mm), and 120-minute (8.72 ± 5.89 sq mm) intermittent reperfusion were significantly smaller than those occurring in the 60-minute (12.02 ± 3.10 sq mm), 90-minute (11.54 ± 2.68 sq mm), or 120-minute (30.43 ± 6.51 sq mm) control groups, respectively (p < 0.05). Furthermore, there was no difference in the occurrence of blood-brain barrier breakdown, intraparenchymal hemorrhage, hemispheric edema, or seizures between control and intermittent reperfusion groups. The results support the hypothesis that intermittent reperfusion is beneficial if vessel occlusion is required during aneurysm repair.

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