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![Figure 5](/view/journals/anpr/55/3/inline-i0003-3006-55-3-82-f05.gif)
Changes in bispectral index (BIS) and Ramsay score (RS). BIS decreased significantly from 10 minutes after the start of dexmedetomidine (Dex) infusion to 30 minutes after the end of Dex infusion (P < .05). RS showed the optimal sedation level from 10 minutes to 30 minutes after the start of Dex infusion.
![<bold>Figure 3.</bold>](/view/journals/anpr/66/2/inline-i0003-3006-66-2-97-f03.png)
Regression and correlation analysis between the mean infusion rate of propofol and frequency (total number of cases, target-controlled infusion, and step-down method). A significant positive correlation was observed between the frequency of intravenous sedation and the dosage of propofol in each situation. The step-down method exhibited the higher increase in rate of propofol infusion at 0.18 mg/kg/h per administration versus TCI at 0.07 mg/kg/h per administration.
![Figure 8.](/view/journals/anpr/58/4/inline-i0003-3006-58-4-166-f08.png)
Representative context-sensitive half-times. The following graph compares the time required for serum concentrations to decline by 50% upon discontinuation of varied durations of continuous infusions. With the exception of remifentanil, the context-sensitive half-times increase following greater durations of infusion. Continuous infusions of diazepam and vfentanyl result in an unacceptable time for recovery. Data are adapted from Hughes et al12 and Egan et al.13
![Figure 1.](/view/journals/anpr/62/2/inline-i0003-3006-62-2-51-f01.png)
Comparisons of systolic blood pressure (SBP), diastolic blood pressure (DBP), mean arterial pressure (MAP), and heart rate (HR) during remifentanil (Remi) infusion with those during no Remi infusion. All variables were decreased during Remi infusion when compared under identical end-tidal carbon dioxide tension (ETCO2) level. The DBP level was increased and HR was decreased along with ETCO2 elevation during Remi infusion. Data are shown as mean ± SD (n = 8). *P < .05 versus respective values at ETCO2 30 mm Hg. #P < .05 between two values at the same ETCO2 level.