Signs
 

Increased Temperature

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Increased Body Temperature

  • Increased temperature most often is related to fevers, however it is important to consider non-inflammatory causes of hyperthermia.
    • Classification

    • Fever - 37.5 - 38.3°C
    • Hyperthermia - 38.4 - 39.9°C
    • Hyperpyrexia - 40 - 41°C
    • Extreme hyperpyrexia - >41.5°C
  • Fevers occur when the body's 'set point' of temperature is set to a higher level than normal. This results in responses aimed at increasing body temperature, including vasoconstriction and shivering.
  • Non-inflammatory hyperthermia occurs when there is an imbalance in heat production and heat dissipation.
    • Causes of Increased Body Temperature

    • Fever

    • Infection - bacterial, protozoal, fungal, viral
    • Auto-immune conditions - rheumatoid arthritis, SLE, thyroiditis
    • Thromboembolism - DVT / PE
    • Metabolic disorders - gout
    • Transfusion reactions
    • Abnormal hypothalamic function - stroke, encephalitis, head trauma
    • Non-Inflammatory Causes

    • Excessive heat production - exertion, thyrotoxicosis, phaeochromocytoma, status epilepticus, tetany
    • Poor heat dissipation - heat stroke, dehydration, autonomic dysfunction, excessive clothing
    • Drug-induced - aspirin, stimulants, anticholinergics
    • Malignant hyperthermia (rare reaction to inhaled anaesthetics)
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