Korean J Anesthesiol.  2013 Jan;64(1):6-11. 10.4097/kjae.2013.64.1.6.

The effect of heated breathing circuit on body temperature and humidity of anesthetic gas in major burns

• Kwak IS
• Choi DY
• Lee TH
• Bae JY
• Lim TW
• Kim KM

• KMID: 2236227
• DOI: http://doi.org/10.4097/kjae.2013.64.1.6

Abstract

BACKGROUND
Cold and dry gas mixtures during general anesthesia cause the impairment of cilliary function and hypothermia. Hypothermia and pulmonary complications are critical for the patients with major burn. We examined the effect of heated breathing circuit (HBC) about temperature and humidity with major burned patients.
METHODS
Sixty patients with major burn over total body surface area 25% scheduled for escharectomy and skin graft were enrolled. We randomly assigned patients to receiving HBC (HBC group) or conventional breathing circuit (control group) during general anesthesia. The esophageal temperature of the patients and the temperature and the absolute humidity of the circuit were recorded every 15 min after endotracheal intubation up to 180 min.
RESULTS
There was no significant difference of the core temperature between two groups during anesthesia. The relative humidity of HBC group was significantly greater compared to control group (98% vs. 48%, P < 0.01). In both groups, all measured temperatures were significantly lower than that after intubation.
CONCLUSIONS
The use of HBC helped maintain airway humidity, however it did not have the effect to minimize a body temperature drop in major burns.

Keyword

Anesthesia; Closed circuit; General anesthesia; Humidity; Hypothermia

MeSH Terms

Anesthesia
Anesthesia, General
Body Surface Area
Body Temperature
Burns
Cold Temperature
Hot Temperature
Humans
Humidity
Hypothermia
Intubation, Intratracheal
Respiration
Skin
Transplants