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- W1893162825 abstract "We examined effects of hypothermia on cerebral metabolic rate and cerebral blood flow in anesthetized, newborn pigs (1-4 days old). Cerebral blood flow (CBF) was determined with 15-micronS radioactive microspheres. Regional CBF ranged from 44 to 66 ml . min-1.100 g-1, and cerebral metabolic rate was 1.94 +/- 0.23 ml O2.100 g-1 . min-1 during normothermia (39 degrees C). Reduction of rectal temperature to 34-35 degrees C decreased CBF and cerebral metabolic rate 40-50%. In another group of piglets, we examined responsiveness of the cerebral circulation to arterial hypercapnia during hypothermia. Although absolute values for normocapnic and hypercapnic CBF were reduced by hypothermia and absolute values for normocapnic and hypercapnic cerebrovascular resistance were increased, the percentage changes from control in these variables during hypercapnia were similar during normothermia and hypothermia. In another group of animals that were maintained normothermic and exposed to two episodes of hypercapnia, there was no attenuation of cerebrovascular dilatation during the second episode. We conclude that hypothermia reduces CBF secondarily to a decrease in cerebral metabolic rate and that percent dilator responsiveness to arterial hypercapnia is unaltered when body temperature is reduced." @default.
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- W1893162825 date "1987-10-01" @default.
- W1893162825 modified "2023-10-15" @default.
- W1893162825 title "Hypothermia reduces cerebral metabolic rate and cerebral blood flow in newborn pigs" @default.
- W1893162825 doi "https://doi.org/10.1152/ajpheart.1987.253.4.h869" @default.
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