Hyperthermia

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hyperthermia

[‚hī·pər′thər·mē·ə]
(physiology)
A condition of elevated body temperature.

Hyperthermia

 

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.

P. N. VESELKIN

References in periodicals archive ?
While long-duration travel and hyperthermal balneotherapy are the most likely causes of PFMS in our patient, diabetic ketoacidosis (6) and streptococcal infections (3) have been suggested in other cases.
stearothermophilus GRE1, newly isolated from a hyperthermal spring in Ethiopia (Haki and Rakshit, 2003b, 2004), was used in this study.
Hyperthermals have been identified and studied with the purpose of advancing out knowledge of how the Earth system responds to large atmospheric, oceanographic, and/or external perturbations.
2006, Eocene hyperthermal event offers insight into greenhouse warming: EOS, Transactions of the American Geophysical Union, v.
The resulting cell culture support interacts with low energy electromagnetic radiation coming from an external and non-invasive source, creating localised hyperthermal effects at the locations of the immobilized nanoparticles and leading to the release of growing cells.
Ultimately, these records and boundary conditions will be integrated into climate models by a dedicated postdoc to unravel the role and behavior of Asian Monsoons with respect to long-term Greenhouse to Icehouse cooling, pCO2 levels as well as global hyperthermal and cooling event such as the PETM, MECO and EOT.
Although this study is of primary nature but it will assess endemism effects on the benthic foraminiferal community, to use benthic foraminifera for determining the age of the interval studied as well as the paleobathymetry and paleoenvironment and to evaluate the suitability of the sedimentary material for future paleoclimatological research on the early Eocene hyperthermals.
They concluded that decreased body size "seems to be a common evolutionary response" by mammals to extreme global warming events, known as hyperthermals, "and thus may be a predictable natural response for some lineages to future global warming.
A team of scientists from the University of Michigan said mammals decreased in size "substantially" during two ancient global warming events, known as hyperthermals.

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