Figure 2. In the control group, plasma epinephrine increased significantly from 32 min of 4% end-tidal desflurane to 8 min of 8% end-tidal desflurane (*P < 0.05). Plasma epinephrine at 8 min of 8% end-tidal desflurane was significantly reduced in both propofol groups compared to control (**P < 0.05). There was no significant difference in norepinephrine concentration after the increase in desflurane concentration within or between the groups.