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Background: We used warming fl uid for maintenance of body temperature in operating room or intensive care unit. This study was aimed to investigate the effect of infusion rate and catheter length on the temperature of warming fluid. Methods: Normal saline was used for testing infusion and temperature of infusion was maintained by a warmer as 40oC. The temperatures of solution in infusion line were measured at 0, 25, 50, 75,and 100 cm apart from warmer at six different flow rates (100, 200, 300, 700, 1,400, and 2,100 ml/h). We also measured the temperature changes at room temperature (RT) and 5oC, 10oC, and 15oC above RT. Results: The time to maintain solution temperature as 40oC was 165, 122, 37, 37, 21, and 19 s at fl ow rate 100, 200, 300, 700,1,400, and 2,100 ml/h. The peak temperature was 43.58 ± 0.58, 44.43 ± 1.18, 44.37 ± 0.70, 43.79 ± 0.61, 42.82 ±0.97, and 42.11 ± 0.92oC according to increasing fl ow rate. The temperature at 100 cm apart from warmer was 23.96 ± 1.53, 25.46 ± 2.76, 29.32 ± 3.47, 31.40 ± 5.38, 31.39 ± 6.75, and 38.14 ± 0.96oC according to increasing fl ow rate. Conclusions: These results suggested that the decreasing rate of temperature was related inversely to the fl ow rate and directly to the catheter length. There may be needed a rapid infusion pump with adequate heating system at a high fl ow rate and to locate the warmer close to patient for reserving a heating eff ect. (Korean J Anesthesiol 2010; 58: 31~37)