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A condition of elevated body temperature.



the accumulation of excess heat in the body of humans or animals, with an elevation of body temperature, caused by external factors that hinder the transfer of heat to the external environment or increase heat intake from outside the body. Hyperthermia arises when there is maximum strain on the physiological mechanisms of thermoregulation (perspiration, dilation of cutaneous blood vessels, and so forth); if the causes are not removed, it progresses, ending with heat stroke at a body temperature of approximately 41°-42° C.

Hyperthermia is accompanied by an increase of metabolism and qualitative disturbances of it, loss of water and salts, and disruption of blood circulation and the delivery of oxygen to the brain, causing agitation and sometimes convulsions and fainting. High temperature during hyperthermia is tolerated less readily than it is in other feverish diseases. The development of hyperthermia is promoted by an increase in heat production (for example, during muscular work), disruption of thermoregulation mechanisms (with narcosis, drunkenness, and certain diseases), or age-related failure of these mechanisms (in very young children). Artificial hyperthermia is used in treating certain nervous and slowly progressing chronic diseases.


References in periodicals archive ?
Assessment of short-and long-term mortality displacement in heat-related deaths in Brisbane, Australia, 1996-2004.
22 heat-related deaths for every 1 million employees.
Heat-related deaths among crop workers-United States, 1992-2006.
TABLE 1 Summary of 2012 Alabama Heat-Related Deaths and Illnesses Category # Heat-related deaths 6 Other 1 (Blank) 5 Heat-related illnesses 809 Athletic related 104 Other 358 Work related 347 Total 815 TABLE 2 Management Occupation Title From 2002 Census 2002 2002 Assigned Assigned Occupational Census SOC (a) Activity MET Classification System Code Code Codes Values Fire fighters 3740 33-2011 12 5.
1,2) A recent meta-analysis showed that both environmental factors, such as the absence of air conditioning, and population risk factors, such as having cardiovascular or psychiatric co-morbidities, increase the probability of heat-related deaths.
During the summer months, the oil spill in the Gulf of Mexico received front-page attention; meanwhile, heat-related deaths and hospitalizations increased in communities from Oklahoma to Maine, but that received far less attention.
Experts at the EEA say that by the end of the century, annual heat-related deaths could be double the 70,000 in the European heat wave of 2003.
High temperatures during the first two weeks of August in 2003 led to an estimated 40,000 heat-related deaths across Europe.
Forty percent of all heat-related deaths occur in people aged 65 or older.
While heat-related deaths in summer will increase, this will be more than offset by a significant reduction in cold-related deaths in winter.
The threat of heat-related deaths shouldn't be a factor.
Britain, for example, with a temperate climate, has only 1,000 heat-related deaths every year, compared with 20,000 cold-related.