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Following operation when the patient is relaxed, the temperature subnormal, and the functional activity of the organs diminished, it is an essential that reaction should be brought about promptly and every means which will promote this result should be employed.
This relaxed abnormal condition of the patient is best overcome by the application of external heat, which is the greatest of all stimulants at this time. Artificial heat is usually applied by placing several hot-water bags about the patient, which is quite sufficient when there is no shock and the temperature is normal. A very small portion, usually the edge of the hot-water bag, comes in contact with the patient, and as a rule
TRACY SE. A SIMPLE AND EFFICIENT MEANS OF APPLYING ARTIFICIAL HEAT. JAMA. 1910;55(17):1443–1444. doi:10.1001/jama.1910.04330170023007