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Related Concept Videos

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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Homeostatic Imbalances in Body Temperature01:19

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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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Hyperventilation refers to a higher-than-normal rate and depth of breathing, often associated with anxiety attacks. This excessive breathing surpasses the body's need to expel CO2, leading to a condition known as hypocapnia - an unusually low level of carbon dioxide in the blood. Hypocapnia can constrict cerebral blood vessels, reducing blood flow to the brain, which may result in dizziness or fainting. Early signs include tingling and muscle spasms in the hands and face, caused by falling...
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Hypercapnic respiratory failure, also known as Type 2 or ventilatory respiratory failure, is a severe condition characterized by the body's inability to effectively remove carbon dioxide (CO2) from the bloodstream. It leads to an arterial CO2 pressure (PaCO2) exceeding 45 mmHg and a blood pH above 7.35. This situation indicates that the body's ventilatory demand, or the ventilation needed to maintain normal PaCO2 levels, surpasses its supply or the maximum gas flow achievable without...
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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.
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Oxygen Transport in the Blood01:27

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Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...
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Esophageal Heat Transfer for Patient Temperature Control and Targeted Temperature Management
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Cerebral oxygenation and hyperthermia.

Anthony R Bain1, Shawnda A Morrison2, Philip N Ainslie1

  • 1Centre for Heart Lung and Vascular Health, University of British Columbia Okanagan, BC, Canada.

Frontiers in Physiology
|March 14, 2014
PubMed
Summary
This summary is machine-generated.

During hyperthermia, reduced cerebral blood flow (CBF) is primarily caused by decreased arterial CO2 pressure (PaCO2) in passive conditions. Dynamic states may involve other factors impacting cerebral perfusion.

Keywords:
cerebral blood flowcerebral oxygenationheat stresshemorrhagehyperthermiasyncope

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Area of Science:

  • Physiology
  • Neuroscience
  • Environmental Health

Background:

  • Hyperthermia significantly reduces cerebral blood flow (CBF).
  • Mechanisms include peripheral blood flow redistribution, hyperventilation, and hypocapnia.
  • The relative contribution of these factors to reduced CBF during hyperthermia is debated.

Purpose of the Study:

  • To review the mechanisms governing changes in CBF during moderate to severe hyperthermia.
  • To discuss the role of arterial CO2 pressure (PaCO2) in regulating CBF.
  • To explore factors affecting cerebral oxygenation during heat stress.

Main Methods:

  • Literature review of studies on hyperthermia and cerebral blood flow.
  • Analysis of experimental data concerning physiological responses to heat stress.
  • Discussion of near-infrared spectroscopy (NIRS) applications and limitations.

Main Results:

  • Reduced PaCO2 is a primary driver of decreased CBF during supine passive hyperthermia.
  • In dynamic conditions (e.g., hemorrhage), impaired peripheral vascular conductance can compromise cerebral perfusion.
  • Cutaneous blood flow influences oxygenation measures like NIRS.

Conclusions:

  • PaCO2 is a critical determinant of CBF regulation during hyperthermia.
  • Understanding these mechanisms is vital for managing heat-related illnesses.
  • Further research is needed to clarify CBF regulation in diverse hyperthermic conditions.