Rewarming in immersion hypothermia: radio-wave and inhalation therapy.
Anesthetized random source dogs were cooled by ice water immersion (1 degree C) to a stable core temperature of 25 degrees C, and subsequently rewarmed with warm humidified inhalation (43 degrees C, 450 cc of min ventilation/kg), radio wave induction hyperthermia (4-6 W/kg) or both therapies simultaneously. The mean time required for core rewarming to 30 degrees C was 262 +/- 29 min for humidified ventilation, 68.5 +/- 6 min for radio wave therapy (P less than 0.01), and 74.8 +/- 12 for both therapies combined (P less than 0.3 vs. radio wave). There was no tissue damage with these protocols. These data suggest radio wave heating alone is the most rapid non-invasive method for core rewarming in immersion hypothermia.
D000818:Animals; D001831:Body Temperature; D004285:Dogs; D006979:Hyperthermia, Induced / Q000379:methods*; D007035:Hypothermia / Q000628:therapy*; D011846:Radio Waves; D012138:Respiratory Therapy