Comparison of forced-air warming systems with upper body blankets using a copper manikin of the human body.
Acta Anaesthesiologica Scandinavica, 2002
Comparison of forced-air warming systems with upper body blankets using a copper manikin of the human body.
abraeue@gwdg.de BACKGROUND: Forced-air warming with upper body blankets has gained high acceptance as a measure for the prevention of intraoperative hypothermia.
This study was conducted to determine the heat transfer efficacy of eight complete upper body warming systems and to gain more insight into the principles of forced-air warming.
A, where Qdot;= heat flux [W], h=heat exchange coefficient [W m-2 degrees C-1], DeltaT=temperature gradient between the blanket and surface [ degrees C], and A=covered area [m2].
We tested eight different forced-air warming systems: (1) Bair Hugger and upper body blanket (Augustine Medical Inc.
Eden Prairie, MN); (2) Thermacare and upper body blanket (Gaymar Industries, Orchard Park, NY); (3) Thermacare (Gaymar Industries) with reusable Optisan upper body blanket (Willy R_sch AG, Kernen, Germany); (4) WarmAir and upper body blanket (Cincinnati Sub-Zero Products, Cincinnati, OH); (5) Warm-Gard and single use upper body blanket (Luis Gibeck AB, Upplands V_sby, Sweden); (6) Warm-Gard and reusable upper body blanket (Luis Gibeck AB); (7) WarmTouch and CareDrape upper body blanket (Mallinckrodt Medical Inc., St.
Luis, MO); and (8) WarmTouch and reusable MultiCover trade mark upper body blanket (Mallinckrodt Medical Inc.) on a previously validated copper manikin of the human body.
The temperature gradient between the blanket and surface (DeltaT) was varied between -8 and +8 degrees C, and h was determined by linear regression analysis as the slope of DeltaT vs.
Mean DeltaT was determined for surface temperatures between 36 and 38 degrees C, as similar mean skin surface temperatures have been found in volunteers.
RESULTS: Total heat flow from the blanket to the manikin was different for surface temperatures between 36 and 38 degrees C.
View rest of article at www.ncbi.nlm.nih.gov «
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