Pre-induction skin-surface warming minimizes intraoperative core hypothermia

Area of Science:

• Anesthesiology
• Perioperative Medicine
• Thermoregulation

Background:

• Uncontrolled intraoperative hypothermia is a common complication.
• Redistribution hypothermia, a significant cause of heat loss, occurs rapidly after anesthetic induction.
• Preventive measures are crucial for maintaining normothermia.

Purpose of the Study:

• To evaluate the efficacy of one hour of preinduction skin-surface warming in mitigating core hypothermia.
• To test the hypothesis that preoperative warming reduces the rate of core temperature decrease during early anesthesia.

Main Methods:

• A randomized prospective study involving 16 adult patients undergoing laparoscopic cholecystectomy.
• Patients were divided into two groups: prewarmed (forced-air warming for 1 hour pre-induction) and control (wool blanket only).
• Core and skin-surface temperatures were monitored before and during the first hour of general anesthesia.

Main Results:

• Prewarmed patients achieved a significantly higher mean skin temperature (37.0°C vs. 34.7°C).
• The rate of core temperature decrease during the first hour of anesthesia was significantly lower in the prewarmed group (0.6°C/hr vs. 1.1°C/hr).
• More prewarmed patients maintained a core temperature ≥36.5°C after one hour of anesthesia (6/8 vs. 1/8).

Conclusions:

• A single hour of preoperative skin-surface warming effectively reduces the development of core hypothermia during early anesthesia.
• Preoperative warming is a valuable strategy, especially for short procedures where redistribution hypothermia is a concern.
• This intervention aids in maintaining perioperative normothermia and preventing complications associated with hypothermia.