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Body heat transfer during hip surgery using active core warming

P Kulkarni1, J Webster, F Carli

  • 1Deprtment of Anaesthesia, Northwick Park Hospital, Harrow, Middlesex, U.K.

Canadian Journal of Anaesthesia = Journal Canadien D'Anesthesie
|July 1, 1995
PubMed
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Active core warming using humidified gases effectively prevents core temperature drop during hip replacement surgery, unlike esophageal warming or no warming. This improves patient thermal regulation.

Area of Science:

  • Anesthesiology
  • Perioperative Medicine
  • Thermoregulation

Background:

  • Maintaining normothermia during surgery is crucial for patient outcomes.
  • Hypothermia can lead to adverse events, including increased blood loss and delayed recovery.
  • Effective heat redistribution strategies are needed to prevent perioperative hypothermia.

Purpose of the Study:

  • To evaluate the impact of active core warming on heat redistribution from the core to the periphery.
  • To assess changes in core, mean skin, and mean body heat during total hip replacement surgery.
  • To compare the efficacy of humidified warmed gases versus an esophageal heat exchanger for active warming.

Main Methods:

  • A study involving 30 patients undergoing total hip replacement, divided into three groups: control (no warming), humidifier (warmed gases at 40°C), and esophageal (heat exchanger).

Related Experiment Videos

  • Core, mean skin, and mean body temperatures were measured at multiple time points: pre-induction, end of surgery, and one hour post-recovery.
  • Standardized operating room temperature and relative humidity were maintained across all groups.

    • Main Results:

    • Core temperature decreased significantly in the control (1.9°C) and esophageal (1.2°C) groups, but not in the humidifier group (0.4°C).
    • Mean skin temperature decreased in the control group (-1.0°C) but increased slightly in the actively warmed groups (0.1°C esophageal, 0.2°C humidifier).
    • Active core warming, particularly with humidified gases, demonstrated a superior ability to maintain core temperature and promote heat redistribution.

    Conclusions:

    • Active core warming using humidified gases is effective in preventing core temperature decrease during total hip replacement.
    • Humidified warmed gases appear more effective than an esophageal heat exchanger in maintaining intraoperative normothermia.
    • These findings suggest that optimizing core warming strategies can significantly improve patient thermal stability during major orthopedic surgery.