Figure 1. Core temperatures during and after cardiopulmonary bypass. The beginning of bypass cooling was designated elapsed time-zero for cooling. Because the duration of cooling differed among patients, and especially between the groups, a second elapsed time-zero was defined as the beginning of rewarming. Similarly, the end of rewarming identified elapsed time-zero for the postbypass period. Fewer data points are shown for the 31 [degree sign]C group (open circles) than for the 27 [degree sign]C group (filled circles), because both the cooling and rewarming periods were shorter. Results are presented as means +/- SDs.