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Published on: November 21, 2017
Hyperthermia and central nervous system injury
W Dalton Dietrich1, Helen M Bramlett
1Department of Neurological Surgery, Miami Project to Cure Paralysis, University of Miami, Miller School of Medicine, Miami, FL 33136, USA. ddietrich@miami.edu
Progress in Brain Research
|July 25, 2007
Summary
Fever after brain or spinal cord injury (SCI) worsens outcomes by increasing cell damage. Controlling fever may improve patient recovery by mitigating these detrimental effects.
Area of Science:
- Neuroscience
- Critical Care Medicine
- Pathophysiology
Background:
- Fever is common after brain and spinal cord injury (SCI).
- Experimental studies show fever exacerbates central nervous system (CNS) injury.
- Mild hyperthermia (>37°C) can worsen outcomes and increase cell damage.
Purpose of the Study:
- To evaluate the detrimental effects of fever after CNS injury.
- To understand the mechanisms underlying hyperthermia's negative impact.
- To highlight the importance of temperature monitoring and fever control.
Main Methods:
- Review of experimental studies on fever and CNS injury.
- Analysis of pathomechanisms aggravated by mild hyperthermia.
- Examination of temperature monitoring and treatment strategies.
Main Results:
- Mild hyperthermia aggravates excitotoxicity, free radical generation, inflammation, apoptosis, and genetic responses.
- Gender differences influence secondary hyperthermia consequences in animal models.
- Dissociations between brain and body temperature emphasize the need for CNS temperature control.
Conclusions:
- Controlling fever after brain or SCI may improve patient outcomes.
- Effective strategies for monitoring and treating hyperthermia are needed.
- Preventing fever is crucial for mitigating secondary injury mechanisms.
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Homeostatic Imbalances in Body Temperature
Hyperthermia occurs when the body's temperature becomes unusually high, often due to heat exposure, intense physical activity, or certain illnesses. This condition can create a dangerous cycle where elevated body temperature increases the metabolic rate, generating more heat and potentially leading to organ failure and brain damage. A severe form of hyperthermia, called heat stroke, can raise body temperature to life-threatening levels. Fever, on the other hand, is a controlled form of...
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A body temperature above 38°C (100.4 °F) is known as fever or pyrexia, and a person with fever is termed 'febrile.' Typically, the hypothalamus, a part of the brain that acts as the body's thermostat, regulates body temperature through a thermoregulatory setpoint. It receives signals from cold and warm thermal receptors throughout the body and adjusts the body's temperature accordingly. Fever occurs when this hypothalamic setpoint is altered, usually in response to an infection or illness.
Types of Fever
Fever can be triggered by several factors, including infections, nervous system disorders, certain cancers, blood diseases like leukemia, embolism, thrombosis, heatstroke, dehydration, surgical trauma, crushing injuries, and allergic reactions.
Here are the different types of fever:
Here are the different types of fever:
Thermoregulation
The human body has a sophisticated thermoregulation system that employs negative feedback mechanisms to maintain an optimal core temperature. When the core temperature drops, peripheral and central thermoreceptors send signals to the hypothalamus, activating the heat-promoting center. This center triggers several responses aimed at increasing the core temperature. First, vasoconstriction reduces the flow of warm blood from internal organs to the skin so that the heat is not lost from the skin,...
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Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...

