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Temperature and metabolic responses to inhalation and bath rewarming protocols
1Defence and Civil Institute of Environmental Medicine, Toronto, Ont., Canada.
Aviation, Space, and Environmental Medicine
|July 1, 1988
Summary
Rapid rewarming in 40°C water is most effective for mild hypothermia. Esophageal temperature monitoring is most sensitive for tracking rewarming progress.
Area of Science:
- Emergency Medicine
- Environmental Physiology
- Thermoregulation
Background:
- Mild hypothermia presents challenges in field settings.
- Effective rewarming strategies are crucial for patient outcomes.
Purpose of the Study:
- To compare the efficacy of different rewarming techniques for mild hypothermia.
- To identify the optimal method for field application.
Main Methods:
- Eight subjects underwent controlled cooling in a water calorimeter.
- Rewarming was achieved via warmed air inhalation, 40°C water immersion, or spontaneous shivering.
- Core body temperatures (rectal, esophageal, auditory) and skin temperatures were monitored.
Main Results:
- 40°C water immersion provided the fastest rewarming and minimal temperature afterdrop.
- Esophageal temperature showed the smallest afterdrop across all methods.
- Auditory and esophageal sites responded faster than rectal during water immersion rewarming.
Conclusions:
- Rapid rewarming in 40°C water is the most efficient method for mild hypothermia.
- Esophageal temperature is the most sensitive indicator of core temperature changes during rewarming.