EXPERIMENTAL HYPOTHERMIA AND REWARMING IN THE DOG RECOVERY AFTER SEVERE REDUCTION IN BODY TEMPERATURE

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Abstract
The ability of normal lightly anesthetized dogs to withstand and to recover from marked cooling was detd. Immersion in iced water to the point of respiratory or cardiac crisis was followed by rapid rewarming in warm water (ca. 42 [degree]C). Thirteen animals survived reduction in deep rectal temp. to an avg. of 14.9[degree]C (range 11.7[degree] to 16.8[degree]C), with complete recovery. Eight animals failed to survive. Fall in body temp. was linear, and the visceral-rectal temp. gradient increased progressively during cooling. Linear fall in arterial blood pressure was accompanied by marked bradycardia. One instance of "rewarming death" was recorded.

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