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Related Experiment Videos

Elevated thermostatic setpoint in postoperative patients.

S M Frank1, M J Kluger, S L Kunkel

  • 1Department of Anesthesiology and Critical Care Medicine, The Johns Hopkins Medical Institutions, Baltimore, Maryland, USA. sfrank@welch.jhu.edu

Anesthesiology
|January 10, 2001
PubMed
Summary
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Postoperative fever is a normal thermoregulatory response, not necessarily infection. This regulated increase in core body temperature (Tc) after surgery is linked to surgical stress and cytokine release.

Area of Science:

  • Physiology
  • Surgical Medicine
  • Immunology

Background:

  • The mechanism and clinical significance of elevated core temperature (Tc) post-surgery remain unclear.
  • Distinguishing normal thermoregulation from infection-related fever is crucial for patient care.
  • This study investigated whether a regulated increase in Tc setpoint occurs after surgical procedures.

Purpose of the Study:

  • To test the hypothesis that a regulated increase in core body temperature setpoint occurs post-surgery.
  • To understand the normal thermoregulatory response in the early postoperative period.
  • To differentiate physiological fever from pathological fever after surgery.

Main Methods:

  • Prospective study of 271 patients within 24 hours of various surgical procedures.

Related Experiment Videos

  • Monitored core body temperature (urinary bladder), skin temperatures, and thermoregulatory responses (vasoconstriction, shivering).
  • Assessed total leukocyte counts and plasma cytokine concentrations (TNF, IL-6, IL-8) in a subset of patients.

    • Main Results:

    • Average maximum Tc increase was 1.4°C, peaking 11.1 hours post-surgery.
    • 50% of patients reached ≥38.0°C, 25% reached ≥38.5°C.
    • Postoperative Tc elevation correlated with vasoconstriction, shivering, IL-6 response, and surgical duration/extent, indicating a regulated response.

    Conclusions:

    • A regulated elevation in core body temperature setpoint (fever) is a normal postoperative occurrence.
    • Early postoperative fever is associated with perioperative stress, surgical factors, and cytokine response.
    • This physiological fever should be differentiated from infection-related fever.