PMID: 15220774Jun 29, 2004Paper

Combination of isoflurane and caspase inhibition reduces cerebral injury in rats subjected to focal cerebral ischemia

Anesthesiology
Satoki InouePiyush M Patel

Abstract

Recent data indicate that the neuroprotective efficacy of isoflurane is not sustained. Delayed neuronal death, mediated in part by apoptosis, contributes to the gradual increase in the size of the infarction. These data suggest that isoflurane may not be able to inhibit delayed neuronal death. The prevention of apoptosis by a caspase inhibitor might provide neuroprotection in addition to that provided by isoflurane. The current study was conducted to determine whether isoflurane-mediated neuroprotection can be made more durable with the administration of z-VAD-fmk, a nonspecific caspase inhibitor. Fasted Wister rats were allocated to awake-zVAD, awake-vehicle, isoflurane-zVAD, or isoflurane-vehicle groups (n = 16/group). Animals were subjected to focal ischemia for 60 min by filament occlusion of the middle cerebral artery. In the awake groups, isoflurane was discontinued after occlusion of the middle cerebral artery. In the isoflurane groups, isoflurane anesthesia was maintained at 1.5 minimum alveolar concentration during occlusion of the middle cerebral artery. Before and after ischemia, daily injections of z-VAD-fmk or vehicle were administered into the lateral cerebral ventricle for 14 days. Neurologic assessment was perfo...Continue Reading

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