Relative Clinical Heat Transfer Effectiveness: ForcedAir Warming Vs. Conductive Fabric Electric Warming, A Randomized Controlled Trial
Journal Title: Journal of Anesthesia and Surgery - Year 2018, Vol 5, Issue 2
Abstract
Study Objective: Forced-air warming (FAW) relies on convection and is limited to the area under a single blanket. Conductive fabric warming (CFW) relies on conductive heat transfer. More important clinically is that CFW can roughly double the body surface area in contact with the heat by using both a blanket over the patient and a heated mattress under the patient. This study is designed to test the hypothesis that doubling the body surface area in conductive contact with heat will improve clinical heat transfer of warming systems. Design: This study is a prospective randomized, controlled trial with a two group, parallel design. Patients and setting: We randomized 41 ASA 1 & 2 patients undergoing open GI surgical procedures in the operating room, lasting more than 2 hours and no need for fluid warming. Interventions: 1) FAW Group; treated with a WarmTouch® upper or lower body blanket. 2) CFW Group; treated with a HotDog® upper or lower body blanket plus an underbody heated mattress. All of the warming blankets and mattress temperatures were set at 39°C. All of the other relevant variables were held constant, including: warming temperature, warming duration, surgical exposure and patient demographics. Measurements: We recorded the rewarming rate as a surrogate indicator of clinical heat transfer effectiveness. Results: The FAW Group (n = 20) experienced a warming rate of 0.01°C/hr over 2 hours. The CFW Group (n = 21) experienced a warming rate of 0.35°C/hr over 2 hours. There were no adverse events due to patient warming in either group. Conclusions: The CFW system showed significantly higher patient warming rates than the FAW system (0.35°C/hr. vs. 0.01°C/hr.), when all other relevant variables were held constant, including warming temperature. Under these controlled conditions, the clinical heat transfer effectiveness of CFW (HotDog®) is significantly greater than FAW (WarmTouch®).
Authors and Affiliations
Haruko Sugai
Keywords
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- EP ID EP421234
- DOI 10.15436/2377-1364.18.1963
- Views 103
- Downloads 0
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