Friday, July 16, 2010

Hypothermia


Central thermoregulation maintain body temperature through perspiration control, vasoconstriction, vasodilatation, chemical thermogenesis, and chills.
Impaired thermoregulation may occur as a result of hypothalamic dysfunction, consistent and central nervous system or because of drugs. Trauma, hypoxia, tumor, or cerebrovascular disease can interfere with the central regulation of temperature.
In addition to the actual exposure to cold, there are factors predisposing the body against hypothermia. Decrease in heat-related disorders include hypothyroidism, hypoglycemia, starvation, malnutrition, immobilization, and reduced activity due to stroke, arthritis, and Parkinson also causes reduced production of heat.
Early signs are fatigue, weakness, slow movement, apathy, speech is not clear, confusion, and cool skin. Muscular rigidity, stiffness, slowed reflexes, pupil dilation, skin becomes very dry, the individual becomes unresponsive, bradycardia, semi-coma or coma, and loss of consciousness are common. Patients who survive are sometimes thought to have died after being found not breathing or pulse was throbbing.

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