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Related Concept Videos

Homeostatic Imbalances in Body Temperature01:19

Homeostatic Imbalances in Body Temperature

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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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Increased Body Temperature01:25

Increased Body Temperature

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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...
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Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

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Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
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Types of Fever01:25

Types of Fever

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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:
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Methods of reducing fever01:22

Methods of reducing fever

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The signs and symptoms of fever include hot and dry skin, flushed face, thirst, muscle aches, anorexia, headache, tachycardia, tachypnea, and fatigue. Elevated body temperature is reduced using two methods: pharmacological and nonpharmacological. Proper identification and treatment of the root cause of a fever is of utmost importance.
Pharmacological Methods of Reducing Fever:
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Decreased Body Temperature01:29

Decreased Body Temperature

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A decreased body temperature can occur in patients with hypothermia and frostbite. Heat loss with extended cold exposure overpowers the body's ability to create heat, resulting in hypothermia. Core temperature readings help classify hypothermia. Mild hypothermia is temperatures between 32 °C (89.6 °F) and 35°C (95 °F) and is caused by impaired thermoregulation. Moderate hypothermia is temperatures between 28 C (82.4 °F) and 32 °C (89.6 °F) caused by...
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A Preclinical Model of Exertional Heat Stroke in Mice
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A Preclinical Model of Exertional Heat Stroke in Mice

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A hot topic--heat waves and stroke.

Fiona Chan1, Oliver Francis, Lizzie Dodd

  • 1Stroke Unit, The Queen Elizabeth Hospital, Adelaide, South Australia, Australia.

International Journal of Stroke : Official Journal of the International Stroke Society
|September 19, 2014
PubMed
Summary
This summary is machine-generated.

Extreme heat waves may increase stroke incidence, challenging previous findings. Further research in developing countries is crucial to understand the impact of climate change on stroke.

Keywords:
climate changedeveloping countriesglobalheat waveruralstroke risk

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Area of Science:

  • Environmental Health
  • Neurology
  • Epidemiology

Background:

  • The link between meteorological factors and stroke presentation is a long-standing debate.
  • Previous studies suggest heat waves are unlikely to increase stroke admissions in Australia and the US.

Purpose of the Study:

  • To investigate the association between extreme heat and stroke incidence following a heat wave in Adelaide, South Australia.
  • To evaluate the generalizability of existing literature on heat waves and stroke admissions to other regions.

Main Methods:

  • Retrospective analysis of stroke incidence data.
  • Correlation with meteorological data during a January 2014 heat wave.
  • Literature review on heat waves and stroke admissions.

Main Results:

  • The study questioned the established literature suggesting no link between heat waves and stroke.
  • Preliminary findings suggest a potential association that warrants further investigation.
  • Existing conclusions may not be universally applicable.

Conclusions:

  • Generalizing findings from Australia and the US to other countries and rural areas may be inappropriate.
  • Prospective studies in developing countries are needed to assess the impact of extreme heat on stroke.
  • Findings aim to inform stroke physicians and policymakers on climate change impacts.