Efficacy and safety of propofol target-controlled infusion combined with butorphanol for sedated colonoscopy

Figure 2 Bar graphs for the amount of propofol used during the sedated colonoscopy and the awakening concentration of propofol in each group. A: The amount of propofol used during the sedated colonoscopy in each group; B: The awakening concentration of propofol in each group. The amount of propofol used for the sedated colonoscopic procedure and the awakening concentration of propofol in group C, group B1 and group B2 are illustrated in the bar graphs. The lowest mean amount of propofol used for sedated colonoscopic procedures was observed in group B2, and there was a significant difference among the groups. The wakening concentration of propofol was defined as the effect-site concentration of propofol in association with eye opening in response to verbal command. The mean awakening concentration of propofol was lower in group B2, when compared to group B1.