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PubMed1992

Limited heat transfer between thermal compartments during rewarming in vasoconstricted patients.

Thermoregulatory vasoconstriction may serve to separate and limit heat transfer between peripheral and central thermal compartments, in effect providing a thermal buffer for central temperature. We hypothesized that thermoregulatory vasoconstriction would limit heat transfer to the central compartment in patients warmed cutaneously. Hypothermic patients (central temperatures < 35 degrees C) recovering from surgery were randomly assigned to receive forced-air warming (n = 6) or warmed cotton blankets (n = 6). The forced-air warmer delivers approximately 50 W of heat, compared to a heat loss of approximately 50 W with warmed cotton blankets. Despite a significantly greater increase in mean skin-surface temperature with forced-air warming, central temperature in the two groups did not significantly differ. All patients vasoconstricted and there was no difference in oxygen consumption between groups. These data confirm that thermoregulatory vasoconstriction limits heat transfer from peripheral to central thermal compartments and impedes skin surface warming of the body core.

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