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Assessment of the efficiency of warming devices during neonatal surgery

Abstract : This study assessed the relative efficiency of different warming devices (surgical sheets covering the body and a tubegauze on the head, forced-air warming, warming mattress) commonly used to prevent body hypothermia during neonatal surgery. Dry heat losses were measured from a thermal manikin, which simulated a low-birth-weight neonate of 1,800 g. The manikin's surface temperatures (35.8degreesC) corresponded to those of neonates nursed in closed incubators. Experiments were performed in a climatic chamber at an ambient temperature of 30degreesC, as commonly found in operating theatres. The supine manikin was naked or covered with operative sheets with a 5x5 cm aperture over the abdomen. Its head could be covered by a tubegauze. Additional warming was provided by conduction through a warming mattress (surface temperature, 39degreesC) and/or by convection (Bair Hugger, forced-air temperature 38degreesC). Covering the manikin with surgical sheets decreased the dry heat loss by 10.4 W. Additional forced-air warming was more efficient than the warming mattress to reduce the total dry heat loss (6.8 W vs 2.1 W). Heat losses were reduced by 7.9 W when combining the warming mattress and Bair Hugger. The heat loss from the head of the covered manikin was reduced from 4.5 W to 3.9 W when the head was covered with the tubegauze. Our data indicate that forced-air warming is more effective than conductive warming in preventing neonatal hypothermia during abdominal operations.
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Submitted on : Friday, March 21, 2014 - 1:59:28 PM
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Philippe Buisson, Veronique Bach, Elmountacer-Billah Elabbassi, Karen Chardon, Stéphane Delanaud, et al.. Assessment of the efficiency of warming devices during neonatal surgery. European Journal of Applied Physiology, Springer Verlag, 2004, 92 (6), pp.694-697. ⟨10.1007/s00421-004-1126-1⟩. ⟨ineris-00962874⟩



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