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Hyperpyrexia

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hyperpyrexia [¦hī·pər·pī′rek·sē·ə]
(medicine)
Extremely high fever.
Hyperpyrexia 

elevation of the body temperature in humans and animals caused by a disturbance in heat loss. A fever of 42°C is considered critical: lethal changes in the brain tissue develop. The critical temperature for an individual may range from 40° to 44°C. A few cases have been recorded in which persons with a temperature of 44°C have recovered. Moderate hyperpyrexia may be induced artificially for therapeutic purposes (treatment of syphilis and other diseases). Artificially induced hyperpyrexia is called hyperthermia.

REFERENCES

Fizicheskie faktory vneshnei sredy [v usloviiakh proizvodstva]. Edited by A. A. Letavet. Moscow, 1960.
Mnogotomnoe rukovodstvo po patologicheskoi fiziologii, vol. 2. Moscow [1966].
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6°F or 42°C resulting in hyperpyrexia.
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A post-mortem revealed that he had died of hyperpyrexia caused my the ingestion of the ecstasy ingredient MDMA.
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Also, if the atmosphere is as warm as or warmer than the skin during times of high humidity, blood brought to the body surface cannot shed heat by conduction to the air, and a condition called hyperpyrexia results.
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