Objective To study the effect of gender and ages on predict blood and effect-site EC50 for propofol and remifentanil TCI and bispectral index at loss of consciousness and response to a standard noxious painful stimulu...Objective To study the effect of gender and ages on predict blood and effect-site EC50 for propofol and remifentanil TCI and bispectral index at loss of consciousness and response to a standard noxious painful stimulus. Methods 405 ASA Ⅰ-Ⅱunpremedicated Chinese patients in 5 medical centers for elective operation were involved. Patients were allocated to 4 groups according to ages (group1: 18<age<30, group2: 30≤age<40, group3: 40≤age<50, group4: 50≤age<65). The propofol was started a predict blood concentration of 1.2 mg/L delivered by Diprifusor, and increased by 0.3 mg/L every 30 s until patients lost their consciousness. After that, effect-site concentration of propofol kept constant and infused remifentanil a predict blood concentration of 2.0 μg/L and increased by 0.3 μg/L every 30 s until they lost response to a standard noxious stimulus. Bispectral index was measured. Probit regression was used to estimate population values for predicted blood and effect-site propofol and remifentanil concentrations at the two clinical end-points and BIS. Results The effect-site and the predict blood propofol concentrations EC50 of male and female were similar. The predict blood and effect-site propofol concentrations EC50 of younger were higher than that of older and BIS values were lower. The blood and effect-site remifentanil ancentrations EC50 at no response to painful stimulus of male and female were similar. The blood and effect-site remifentanil concentrations EC50 and BIS values at this point of each group were similar. 50% of male and female patients lost their consciousness at a BIS value with 54.0 and 59.0 respectively; and at loss of response to painful stimulus with 60.8 and 67.3 respectively. Conclusion Gender didn’t affect the predicted propofol and remifentanil blood and effect-site concentration but affected the BIS values. The propofol concentrations of older were lower than that of younger. And that of remifentanil were not different between younger and older.展开更多
文摘Objective To study the effect of gender and ages on predict blood and effect-site EC50 for propofol and remifentanil TCI and bispectral index at loss of consciousness and response to a standard noxious painful stimulus. Methods 405 ASA Ⅰ-Ⅱunpremedicated Chinese patients in 5 medical centers for elective operation were involved. Patients were allocated to 4 groups according to ages (group1: 18<age<30, group2: 30≤age<40, group3: 40≤age<50, group4: 50≤age<65). The propofol was started a predict blood concentration of 1.2 mg/L delivered by Diprifusor, and increased by 0.3 mg/L every 30 s until patients lost their consciousness. After that, effect-site concentration of propofol kept constant and infused remifentanil a predict blood concentration of 2.0 μg/L and increased by 0.3 μg/L every 30 s until they lost response to a standard noxious stimulus. Bispectral index was measured. Probit regression was used to estimate population values for predicted blood and effect-site propofol and remifentanil concentrations at the two clinical end-points and BIS. Results The effect-site and the predict blood propofol concentrations EC50 of male and female were similar. The predict blood and effect-site propofol concentrations EC50 of younger were higher than that of older and BIS values were lower. The blood and effect-site remifentanil ancentrations EC50 at no response to painful stimulus of male and female were similar. The blood and effect-site remifentanil concentrations EC50 and BIS values at this point of each group were similar. 50% of male and female patients lost their consciousness at a BIS value with 54.0 and 59.0 respectively; and at loss of response to painful stimulus with 60.8 and 67.3 respectively. Conclusion Gender didn’t affect the predicted propofol and remifentanil blood and effect-site concentration but affected the BIS values. The propofol concentrations of older were lower than that of younger. And that of remifentanil were not different between younger and older.
