Figure 1. Changes in heart rate (HR; upper) and systolic blood pressure (SBP; lower) from before to after incision. Data are expressed as the mean +/− SD. [dagger] Significantly lower than the baseline within the group. [double dagger] Significantly higher than the baseline within the group. #Increase in HR significantly higher than in the 1 MAC xenon and N²O groups. *Increase in SBP significantly higher than the 0.7 MAC xenon, 1 MAC xenon, and N²O groups.