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In the hospital, active core rewarming of a hypothermia victim is done by "inhalation rewarming." This procedure donates heat directly to the head, neck, and core of the body through inhalation of warm, water-saturated air at 107 - 122°F. Inhalation rewarming warms the hypothalemus, respiratory center, and the cardiac center at the base of the brainstem. Inhalation rewarming also eliminates respiratory heat loss, which accounts for 10% to 30% of the body's heat loss.