FORCED-AIR SPEEDS REWARMING IN ACCIDENTAL HYPOTHERMIA

Study objective: To compare the rates of rewarming of forced-air and p assive insulation as a treatment for accidental hypothermia. Methods: We carried out a prospective, randomized clinical trial in two urban, university-affiliate emergency departments. Our subjects were 16 adult hypothermia victims with core temperatures less than 32 degrees C. A convective cover inflated with air at about 43 degrees C (forced-air g roup) or cotton blankets (control group) were applied until the patien t's core temperature reached 35 degrees C. Members of both groups were given IV fluids warmed to 38 degrees C and warmed, humidified oxygen at 40 degrees C by inhalation. Results: The mean+/-SD initial temperat ure was 28.8 degrees+/-2.5 degrees C (range, 25.5 degrees C to 31.9 de grees C) in the patients who underwent forced-air rewarming and 29.8 d egrees+/-1.5 degrees C (range, 28.2 degrees C to 31.9 degrees C) in th ose given blankets. Core temperature increased about 1 degrees C/hour faster in patients treated with forced-air rewarming (about 2.4 degree s C/hour) than in patients given only cotton blankets (about 1.4 degre es C/hour, P=.01). Core-temperature afterdrop was detected in neither group. Conclusion: Forced air accelerated the rate of rewarming withou t producing apparent complications in hypothermic patients.