罗哌卡因混合舒芬太尼用于剖宫产术患者腰麻的半数有效剂量

目的 确定剖宫产术患者混合舒芬太尼时罗哌卡因腰麻的半数有效剂量(ED50).方法 择期行剖宫产术患者28例,ASA分级Ⅰ或Ⅱ级,经L2,3间隙行脊椎.硬膜外联合穿刺.蛛网膜下腔注射罗哌卡因混合舒芬太尼5 μg,注射时间30 s.第1例患者罗哌卡因剂量为11 mg,采用序贯法,根据腰麻是否成功确定下一例患者的罗哌卡因剂量,相邻剂量梯度为1 mg.采用序贯法计算罗哌卡因腰麻的ED50(95%可信区间).结果 罗哌卡因腰麻的ED50为7.780 mg(95%可信区间为6.850～8.836 mg).结论 罗哌卡因混合舒芬太尼5 μg用于剖宫产术腰麻的ED50为7.780 mg.

Abstract：

Objective To determine the median effective dose (ED50 ) of ropivacaine for spinal anesthesia when combined with sufentanil in patients undergoing caesarean section. Methods Twenty-eight ASA Ⅰ or Ⅱ parturients, aged 18-40 yr, weighing 50-110 kg, undergoing cesarean section under combined spinal-epidural anesthesia, were enrolled in this study. Combined spinal-epidural anesthesia was performed at L2,3 interspace. The mixture of ropivacaine and 5 fig sufentanil was injected into the subarachnoid space over 30 s. The initial dose of ropivacaine was 11 mg. The dose was increased/decreased by 1 mg in the next patient. The ED50 and 95% confidence interval were calculated by up-and-down method. Results The ED50 of ropivacaine was 7.780 mg (95% confidence interval 6.850-8.836 mg). Conclusion When combined with sufentanil 5 μg, the ED50 of ropivacaine for spinal anesthesia is 7.780 mg in patients undergoing caesarean section.

Median effective dose of ropivacaine for spinal anesthesia when combined with sufentanil in patients undergoing caesarean section

Objective To determine the median effective dose (ED50 ) of ropivacaine for spinal anesthesia when combined with sufentanil in patients undergoing caesarean section. Methods Twenty-eight ASA Ⅰ or Ⅱ parturients, aged 18-40 yr, weighing 50-110 kg, undergoing cesarean section under combined spinal-epidural anesthesia, were enrolled in this study. Combined spinal-epidural anesthesia was performed at L2,3 interspace. The mixture of ropivacaine and 5 fig sufentanil was injected into the subarachnoid space over 30 s. The initial dose of ropivacaine was 11 mg. The dose was increased/decreased by 1 mg in the next patient. The ED50 and 95% confidence interval were calculated by up-and-down method. Results The ED50 of ropivacaine was 7.780 mg (95% confidence interval 6.850-8.836 mg). Conclusion When combined with sufentanil 5 μg, the ED50 of ropivacaine for spinal anesthesia is 7.780 mg in patients undergoing caesarean section.