Exposure to cold may cause decreased body temperature (hypothermia Hypothermia Hypothermia is a core body temperature < 35° C. Symptoms progress from shivering and lethargy to confusion, coma, and death. Mild hypothermia requires a warm environment and insulating blankets... read more ) and focal soft-tissue injury.
Tissue injury without freezing includes frostnip Frostnip Acute or chronic injuries without freezing of tissue may result from cold exposure. The mildest cold injury is frostnip. Affected areas are numb, swollen, and red. Treatment is rewarming, which... read more
, immersion foot Immersion (trench) foot Acute or chronic injuries without freezing of tissue may result from cold exposure. The mildest cold injury is frostnip. Affected areas are numb, swollen, and red. Treatment is rewarming, which... read more , and chilblains Chilblains (pernio) Acute or chronic injuries without freezing of tissue may result from cold exposure. The mildest cold injury is frostnip. Affected areas are numb, swollen, and red. Treatment is rewarming, which... read more .
Treatment Treatment Hypothermia is a core body temperature < 35° C. Symptoms progress from shivering and lethargy to confusion, coma, and death. Mild hypothermia requires a warm environment and insulating blankets... read more is rewarming and selective, usually delayed, surgical treatment for injured tissues.
Susceptibility to all cold injury is increased by exhaustion, undernutrition, dehydration, hypoxia, impaired cardiovascular function, and contact with moisture or metal.
Prevention of Cold Injury
Prevention is crucial. Several layers of warm clothing and protection against moisture and wind are important even when the weather does not seem to threaten cold injury. Clothing that remains insulating when wet (eg, made of wool or polypropylene) should be worn. Gloves and socks should be kept as dry as possible; insulated boots that do not impede circulation should be worn in very cold weather. A warm head covering is also important.
Consuming ample fluids and food helps sustain metabolic heat production.
Paying attention to when body parts become cold or numb and immediately warming them may prevent cold injury.
General reference
1. Dow J, Giesbrecht GG, Danzl DF, et al: Wilderness Medical Society Clinical Practice Guidelines for the Out-of-Hospital Evaluation and Treatment of Accidental Hypothermia: 2019 Update. Wilderness Environ Med 30(4S):S47-S69, 2019. doi: 10.1016/j.wem.2019.10.002
