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• W1970427487 abstract "Background and Purpose Previous studies from this laboratory have shown that mild intraischemic or prolonged (ie, 12 to 24 hours) postischemic hypothermia conveys long-lasting (1 to 6 months) protection against CA1 injury. However, these studies have used young animals (aged ≈3 to 5 months). Stroke incidence rises sharply in late middle age at a time when changes in brain chemistry could alter the response to neuroprotective treatments. Therefore, we evaluated the efficacy of hypothermia in an older population (aged 18 to 20 months) of gerbils. Methods Three groups of gerbils were exposed to a 5-minute episode of global ischemia or sham occlusion. One group was cooled during ischemia (mean brain temperature of 32°C). A second group was maintained at normothermia (36.4°C) during occlusion and the first hour of reperfusion. Beginning 1.0 hour after occlusion, these gerbils were gradually cooled to 32°C and maintained at this level before gradual rewarming to 37°C at 25 hours after ischemia. The third ischemic group was kept at normothermia during surgery and the first hour of reperfusion. After surgery, all animals were tested for acute (ie, within 30 hours of ischemia) changes in locomotor activity as well as for chronic (ie, 5, 10, and 30 days after ischemia) habituation deficits in an open field test. Results Both intraischemic and postischemic hypothermia provided robust protection ( P <.0001) of hippocampal CA1 neurons when assessed 30 days after ischemia. However, intraischemic hypothermia was more effective than postischemic hypothermia in providing behavioral protection. Conclusions This study demonstrates that both intraischemic and prolonged postischemic hypothermia provide robust and lasting (30-day survival) histological protection against a severe ischemic insult. The extent of behavioral protection with postischemic hypothermia was less than that previously observed in younger animals. This suggests that neuroprotective treatments in young animals may lose efficacy as a result of aging." @default.
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• W1970427487 date "1997-11-01" @default.
• W1970427487 modified "2023-10-02" @default.
• W1970427487 title "Hypothermic Neuroprotection" @default.
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• W1970427487 doi "https://doi.org/10.1161/01.str.28.11.2238" @default.
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