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Warmed humidified inspired oxygen accelerates postoperative rewarming
S M Frank1, T W Hesel, H K El-Rahmany
1Department of Anesthesiology and Critical Care Medicine, The Johns Hopkins Medical Institutions, Baltimore, MD 21287, USA. sfrank@welch.jhu.edu
Study Objective:
To investigate the efficacy of warmed, humidified inspired oxygen (O(2)) for the treatment of mildly hypothermic postoperative patients.
Design:
Prospective, randomized, unblinded clinical trial.
Setting:
Postanesthesia care unit in a tertiary care hospital.
Patients And Interventions:
30 ASA physical status I, II, and III patients following intraabdominal surgical procedures were randomly assigned to receive either routine O(2) therapy (control group, n = 15), or warmed (42 degrees C) humidified O(2) (treatment group, n = 15) for the initial 90 postoperative minutes.
Measurements:
Core (tympanic) temperature, dry mouth score and shivering score.
Main Results:
Tympanic temperature was similar in both groups on admission ( approximately 35.8 degrees C). Rewarming rate in the first postoperative hour was greater in the treatment group (0.7 +/- 0.1 degrees C. hr(-1)) compared to the control group (0.4 +/- 0.1 degrees C. hr(-1)) (p = 0.03). Patients receiving the warmed, humidified O(2) had a lower incidence of dry mouth compared to the control group (p = 0.03). The incidence of shivering was low and similar in both groups.
Conclusions:
Warming and humidifying inspired O(2) hastens recovery from hypothermia in postoperative patients.
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