UNDER-BODY FORCED-AIR WARMING BLANKET VERSUS RESISTIVE HEATING BLANKET FOR PREVENTION OF HYPOTHERMIA DURING SPINAL SURGERY: A RANDOMIZED PROSPECTIVE STUDY
Prevention of hypothermia in patients undergoing major posterior approach spinal surgery can be difficult, as a
large body surface is exposed to the cold environment of the operating theatre. We compared the efficacy of a
new under-body forced-air warming blanket with that of a resistive heating blanket in preventing hypothermia.
Sixty patients undergoing major posterior approach spinal surgery lasting for more than 2 hours were randomly
assigned to warming with a full under-body forced-air warming blanket or three segments of resistive heating
blankets, both set at 42Â°C. The ambient temperature was kept near 20Â°C. Nasopharyngeal, rectal and axillary
temperatures were measured at regular intervals. Changes in core temperature (average of nasopharyngeal
and rectal) over time were compared by the independent t-test.
The characteristics of the patients were comparable. The baseline core temperature was 36.36 Â±0.38Â°C in the
forced-air group and 36.27 Â± 0.46Â°C in the resistive heating group. During the first hour, the core temperature
decreased similarly from baseline in both groups. From 100 minutes after induction until the end of the surgery,
core temperature rose in both groups. At the end of surgery, the core temperature was increased by 0.08
Â± 0.09Â°C from baseline in the forced-air group but decreased by 0.40 Â±0.04Â°C from baseline in the resistive
heating group. The difference in the change of the core temperature, at the end of the surgery, between the
two groups is statistically significant (P<0.05).
We demonstrated that the new under-body forced-air warming blanket is superior to the resistive heating
blanket in preventing hypothermia in patients undergoing major posterior approach spinal surgery.
All authors agree that the article, if editorially accepted for publication, shall be licensed under the Creative Commons Attribution License 4.0 to allow others to freely access, copy and use research provided the author is correctly attributed, unless otherwise stated. All articles are available online without charge or other barriers to access. However, anyone wishing to reproduce large quantities of an article (250+) should inform the publisher. Any opinion expressed in the articles are those of the authors and do not reflect that of the University of Malaya, 50603 Kuala Lumpur, Malaysia.