Efficiency of a new radiant heater for postoperative rewarming

Autor: S. Martens, Andreas Weyland, Gerhard Hellige, Ulrich Braun, Wolfgang Weyland, U. Fritz, H. Neumann, T. A. Crozier
Rok vydání: 1994
Předmět:
Zdroj: Acta Anaesthesiologica Scandinavica. 38:601-606
ISSN: 1399-6576
0001-5172
Popis: Effective rewarming devices have only become available recently. This investigation compares the efficiency of an new overhead radiant heater (ARAGONA Thermal Ceilings TM, CTCX, 1000 W) with that of an electric blanket (50 W) or a standard hospital blanket. 35 patients undergoing postoperative assisted ventilation and continued sedation were randomly assigned to one of the treatments. Shivering, oxygen uptake, heart rate and invasive blood pressure were measured and the increase in total body heat minus body heat production was calculated as heat balance. Results are given as medians (range). Subcutaneous temperatures were taken to calculate the mean skin temperature. The evaluation was undertaken for an oesophageal temperature interval of 35 to 37C. All groups exhibited a similar mean oxygen uptake i.e. thermogenesis (3.5 (2.7–4.0) ml kg-1 min-1; 3.3 (2.7–4.9) ml kg-1·min-1; 3.2 (2.4–5.1) ml kg-1. min-1) which correspond to a resting energy expenditure. The time of rewarming of the radiant heat treated group (n = 12) (100 (76–143) min) for this interval was significantly reduced in comparison to both other groups (183 (116–320) min; 231 (115–340) min). A slightly positive heat balance was only achieved in the group treated by radiant heat, indicating that all metabolic heat was conserved or heat losses were compensated by transfer of external heat. Shivering was significantly reduced in the radiant heater group whereas the rate pressure product was insignificantly higher. We did not find any significant effect for the electric heating blanket in comparison to the control group. We conclude that the ARAGONA Thermal Ceilings TM seems to be an effective device for postoperative rewarming without related side effects. For the investigated temperature interval it can reduce the time of rewarming to about 50% of control values at the same rate of thermogenesis.
Databáze: OpenAIRE
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