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Related Experiment Videos

Thermogenesis after major elective surgical procedures.

F Carli1, V R Aber

  • 1Department of Anaesthesia, Royal Postgraduate Medical School, Hammersmith Hospital, London, UK.

The British Journal of Surgery
|November 1, 1987
PubMed
Summary

Postoperative body temperature in patients undergoing major surgery shows two distinct peaks within 48 hours. This study found no evidence of a circadian rhythm influencing these temperature changes in patients after surgery.

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Area of Science:

  • Physiology
  • Surgical Medicine
  • Thermoregulation

Background:

  • Postoperative body temperature fluctuations are common in patients after major surgery.
  • Understanding these temperature changes is crucial for patient recovery and monitoring.

Purpose of the Study:

  • To investigate the sequential changes in body temperature for 48 hours following major elective surgery.
  • To determine if a circadian rhythm influences postoperative body temperature oscillations.
  • To analyze the relationship between body temperature and metabolic rate post-surgery.

Main Methods:

  • Core body temperature (aural canal) was measured in 147 patients for 48 hours after major abdominal, cardiac, orthopedic, and pelvic surgery.
  • A subgroup of 14 cardiac surgery patients had their temperature monitored for 72 hours postoperatively, compared to a 24-hour preoperative cycle.

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  • Postoperative body temperature and metabolic rate (oxygen consumption) were analyzed.

    • Main Results:

    • Core body temperature increased immediately after surgery, peaking at 37.5°C around 14 hours post-surgery, followed by a second peak of 37.4°C at 18 hours.
    • The interval between the two temperature peaks remained consistent across all surgery types.
    • No circadian rhythm was observed in postoperative core temperature oscillations, even when compared to preoperative cycles.

    Conclusions:

    • Postoperative body temperature exhibits a biphasic pattern after major surgery, independent of surgery type.
    • Circadian rhythms do not appear to govern body temperature changes in the immediate postoperative period.
    • Postoperative increases in core and skin temperatures correlate with metabolic rate changes, including oxygen consumption.