Heat loss during surgical skin preparation

Area of Science:

• Anesthesiology
• Perioperative Medicine
• Thermoregulation

Background:

• Hypothermia is a rapid complication during anesthesia, partly due to evaporative heat loss from surgical skin preparation.
• This study investigated the contribution of skin preparation solutions to hypothermia.

Purpose of the Study:

• To test the hypothesis that skin preparation solution evaporation significantly contributes to hypothermia.
• To quantify heat loss associated with different skin preparation solutions and methods.

Main Methods:

• Five volunteers were exposed to various skin preparation solutions (water, 50% ethanol/water, povidone-iodine gel) under different temperature and warming conditions.
• Heat loss and skin temperatures were measured using thermal flux transducers.
• A mathematical model predicted cutaneous heat loss based on skin temperature.

Main Results:

• Heat loss was significantly lower with water-based solutions compared to alcohol-based solutions.
• Radiant warming and warming of solutions reduced heat loss but remained small overall.
• Calculated decreases in mean body temperature ranged from -0.2 to -0.7°C/m².

Conclusions:

• Evaporative heat loss from skin preparation is minimal compared to other causes of perioperative hypothermia.
• Water-based solutions are preferable to alcohol-based ones for reducing heat loss.
• Focusing on other factors is recommended for maintaining intraoperative normothermia.