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Background  Temperature management is used with increased frequency as a tool to mitigate neurological injury. Although frequently used, little is known about the optimal cooling methods for inducing and maintaining controlled normo- and hypothermia in the intensive care unit (ICU). In this study we compared the efficacy of several commercially available cooling devices for temperature management in ICU patients with various types of neurological injury.    Methods  Fifty adult ICU patients with an indication for controlled mild hypothermia or strict normothermia were prospectively enrolled. Ten patients in each group were assigned in consecutive order to conventional cooling (that is, rapid infusion of 30 ml/kg cold fluids, ice and/or coldpacks), cooling with water circulating blankets, air circulating blankets, water circulating gel-coated pads and an intravascular heat exchange system. In all patients the speed of cooling (expressed as°C/h) was measured. After the target temperature was reached, we measured the percentage of time the patient's temperature was 0.2°C below or above the target range. Rates of temperature decline over time were analyzed with one-way analysis of variance. Differences between groups were analyzed with one-way analysis of variance, with Bonferroni correction for multiple comparisons. A  p  < 0.05 was considered statistically significant.    Results  Temperature decline was significantly higher with the water-circulating blankets (1.33 ± 0.63°C/h), gel-pads (1.04 ± 0.14°C/h) and intravascular cooling (1.46 ± 0.42°C/h) compared to conventional cooling (0.31 ± 0.23°C/h) and the air-circulating blankets (0.18 ± 0.2°C/h)  (p  < 0.01). After the target temperature was reached, the intravascular cooling device was 11.2 ± 18.7% of the time out of range, which was significantly less compared to all other methods.    Conclusion  Cooling with water-circulating blankets, gel-pads and intravascular cooling is more efficient compared to conventional cooling and air-circulating blankets. The intravascular cooling system is most reliable to maintain a stable temperature.

Comparison of cooling methods to induce and maintain normo- and hypothermia in intensive care unit patients: a prospective intervention study