Effective doses 50% and 95% of subarachnoid injection of sufentanil with ropivacaine in lumbar anesthesia for cesarean section in severe preeclampsia

Objective: This study aimed to determine the ED50 and ED95 of 10 mg of 0.5% ropivacaine combined with different doses of sufentanil in lumbar anesthesia for cesarean sections in patients with severe preeclampsia by the sequential method. Methods: A total of 47 patients with severe preeclampsia, who underwent cesarean section, were enrolled in the present study. The first patient was given a subarachnoid injection of 10 mg of isobaric 0.5% ropivacaine plus 2.5 mu g of sufentanil. If the anesthetic effect was satisfactory, the dose of sufentanil used for the next patient was reduced by 0.5 mu g. If the anesthetic effect was unsatisfactory, the dose of sufentanil used for the next patient was increased by 0.5 mu g. Results: The ED50 of sufentanil was 1.830 mu g, with a 95% CI ranging within 1.517-2.128 mu g, while the ED95 of sufentanil was 2.852 mu g with a 95% CI ranging within 2.429 4.338 mu g. Conclusion: The ED5o and ED95 of io mg of isobaric 0.5% ropivacaine combined with different doses of sufentanil in lumbar anesthesia for cesarean sections in patients with severe preeclampsia werei.83o pg and 2.852 pg, respectively.