FIGURE LEGEND
Figure 1. Placement of BIS and PSI patches on the patient’s forehead.
Figure 2. Flow diagram of the study
Figure 3. Consecutive target REM concentrations during PSI guide anesthesia for EC50 determination among groups. The red triangle represents “positive”; and the blue dot represents “negative”. (A) The variation of concentration of REM according to the change of PSI in high group; (B) The variation of concentration of REM according to the change of PSI in middle group; (C) The variation of concentration of REM according to the change of PSI in low group. (D) REM EC50 and its 95% confidence interval of groups.
Figure 4.  The time of change in MAP, HR, PSI and BIS. (A) The change of MAP. (B) The change of HR. (C) The change of PSI. (D) The change of BIS.
Figure 5.  Density spectral arrays showing EEG spectral activity of six patients from different groups. a represent the minimum concentration while b represent maximum. (A, B, C) Change of DSA among high, middle and Low group. (D) dispaly brain wave shape and its power value.
Figure 6.The ROC curve of PSI and BIS. The area under the PSI curve was greater than the area under the BIS curve (0.95 ± 0.02 versus 0.89 ± 0.04, respectively).