a) Both in-line countercurrent warming and in-line microwave warming were associated with small increases in parameters of red cell damage representing statistically and clinically insignificant hemolysis. b) Blood sitting in any blood warming device is subject to statistically significant but clinically irrelevant increases in those parameters. c) At high-flow rates, the in-line microwave device warmed blood to higher outlet temperatures than the single channel countercurrent water bath warmer. This method may represent a clinical blood warming modality of the near future.
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