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Hyperthermia is an elevated body temperature due to failed thermoregulation. Hyperthermia occurs when the body produces or absorbs more heat than it can dissipate. When the elevated body temperatures are sufficiently high, hyperthermia is a medical emergency and requires immediate treatment to prevent disability and death.
The most common causes are heat stroke and adverse reactions to drugs. Heat stroke is an acute condition of hyperthermia that is caused by prolonged exposure to excessive heat and/or humidity. The heat-regulating mechanisms of the body eventually become overwhelmed and unable to effectively deal with the heat, causing the body temperature to climb uncontrollably. Hyperthermia is a relatively rare side effect of many drugs, particularly those that affect the central nervous system. Malignant hyperthermia is a rare complication of some types of general anesthesia.
Hyperthermia can be created artificially by drugs or medical devices. Hyperthermia therapy may be used to treat some kinds of cancer and other conditions, most commonly in conjunction with radiotherapy.NCI> from the U.S. National Cancer Institute
Hyperthermia differs from a fever in the mechanism that causes the elevated body temperatures: a fever is caused by a change in the bodys temperature set-point.
The opposite of hyperthermia is hypothermia, which occurs when an organisms temperature drops below that required for normal metabolism. Hypothermia is caused by prolonged exposure to low temperatures and is also a medical emergency requiring immediate treatment.
Signs and symptoms
The normal human body temperature in a healthy adult can be as high as 37.7°C (99.9°F) in the late afternoon.Harrisons /> Hyperthermia requires an elevation from the temperature that would otherwise be expected. Such elevations range from mild to extreme; body temperatures above 40°C (104 °F) can be life-threatening.
Hot, dry skin is a typical sign of read more at » http://en.wikipedia.org/wiki/Hyperthermia
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