• BJOG · Nov 2008

    Randomized Controlled Trial Multicenter Study

    Titrated low-dose vaginal and/or oral misoprostol to induce labour for prelabour membrane rupture: a randomised trial.

    • L Bricker, H Peden, A J Tomlinson, T K Al-Hussaini, T Idama, C Candelier, M Luckas, H Furniss, A Davies, B Kumar, J Roberts, and Z Alfirevic.
    • Obstetric Directorate, Liverpool Women's NHS Foundation Trust, Liverpool, UK. leanne.bricker@lwh.nhs.uk
    • BJOG. 2008 Nov 1; 115 (12): 1503-11.

    ObjectiveTo evaluate the clinical effectiveness and safety of titrated low-dose misoprostol for induction of labour (IOL) in the presence of prelabour rupture of membranes (PROM).DesignRandomised controlled trial.SettingMaternity units in the UK (9) and Egypt (1).PopulationWomen >34 weeks of gestation with PROM, singleton viable fetus and no previous caesarean section.MethodsSubjects randomised to IOL with a titrated low-dose misoprostol regimen (oral except if unfavourable cervix, where initial dose vaginal) or a standard induction method, namely vaginal dinoprostone followed by intravenous oxytocin if the cervix was unfavourable or intravenous oxytocin alone if the cervix was favourable.Main Outcome MeasuresPrimary outcome measures were caesarean section and failure to achieve vaginal delivery within 24 hours. Analysis was by intention to treat.ResultsThe trial did not achieve the planned sample size of 1890 due to failure in obtaining external funding. Seven hundred and fifty-eight women were randomised (375 misoprostol and 383 standard). There were less caesarean section (14 versus 18%, relative risk [RR] 0.79; 95% CI 0.57-1.09) and less women who failed to achieve vaginal delivery within 24 hours in the misoprostol group (24 versus 31%, RR 0.79; 95% CI 0.63-1.00), but the differences were not statistically significant. Subgroup analysis showed that with unfavourable cervix, misoprostol may be more effective than vaginal dinoprostone. There was no difference in hyperstimulation syndrome. There were more maternal adverse effects with misoprostol, but no significant differences in maternal and neonatal complications.ConclusionsTitrated low-dose misoprostol may be a reasonable alternative for IOL in the presence of PROM, particularly in women with an unfavourable cervix. Safety and rare serious adverse events could not be evaluated in a trial of this size.

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