Abstract

Hypothermia induced by the use of neuroplegic drugs such as Hydergine, chlorpromazine or promethazine, followed by refrigeration, does not significantly enhance the protective action afforded by refrigeration alone against the lethal dose of whole body x-irradiation in CF1 male mice. The neuroplegic drugs, without refrigeration, provide a slight degree of protection, probably due to the slight reduction in the body temperature. It appears that the action of hypothermia as a protective mechanism depends not on depression of metabolism alone, but on a general depression of bodily processes. Urethane, in conjunction with refrigeration, appears to augment the lethal effect of x-irradiation in the CF1 strain of male mice.

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