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  • Title: High-dose vaginal misoprostol versus concentrated oxytocin plus low-dose vaginal misoprostol for midtrimester labor induction: a randomized trial.
    Author: Nuthalapaty FS, Ramsey PS, Biggio JR, Owen J.
    Journal: Am J Obstet Gynecol; 2005 Sep; 193(3 Pt 2):1065-70. PubMed ID: 16157113.
    Abstract:
    OBJECTIVE: This study was undertaken to compare the efficacy and side effects of a high-dose vaginal misoprostol regimen to concentrated intravenous oxytocin plus low-dose vaginal misoprostol for midtrimester labor induction. STUDY DESIGN: Women at 14 to 24 weeks, with obstetric or fetal indications for delivery and no prior cesarean, were randomly assigned to receive either vaginal misoprostol 600 microg x 1, then 400 microg every 4 hours x 5 (group 1) or escalating dose-concentrated oxytocin infusions (277-1667 mU/min) plus vaginal misoprostol 400 microg x 1, then 200 microg every 6 hours x 2, then 100 microg x 1 (group 2). Analysis was by intent to treat. Primary outcomes were live birth rate and induction-to-delivery interval. RESULTS: The intended sample size was 70 women per group; however, the trial was terminated at the initial interim analysis because of a highly significant difference in 1 of the primary study outcomes. Twenty women were assigned to group 1 and 18 were assigned to group 2. Median induction-to-delivery interval was significantly shorter in group 1 (12 hours, range 4-44 hours) versus group 2 (18 hours, range 7-36 hours; P = .01). Induction success rate at 12 hours was significantly higher in group 1 (60%) compared with group 2 (22%, P = .02). No significant difference was noted in the live birth rate between groups 1 and 2 (13%, 0%, P = .16). The incidence of retained placenta requiring curettage, chorioamnionitis, intrapartum fever, nausea, emesis, and diarrhea were similar between both groups. CONCLUSION: Compared with concentrated oxytocin plus low-dose vaginal misoprostol, high-dose vaginal misoprostol significantly shortens midtrimester labor inductions.
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