
Obstetrics and gynecology (PubMed)··Systematic Review
Labor and delivery nurses are essential in monitoring cervical ripening, administering induction pharmacotherapy, and managing prolonged labor. Understanding the physiologic mechanisms and clinical outcomes of progesterone receptor blockade helps perinatal nurses anticipate cervical changes, titrate subsequent oxytocin infusions safely, and support shared decision-making during term inductions.
L&D / OBMed-SurgCervical ripening is often the longest and most unpredictable phase of labor induction, prompting investigation of oral progesterone receptor antagonists. Investigators conducted a systematic review and meta-analysis conforming to PRISMA guidelines and registered in PROSPERO (CRD420251236886), searching MEDLINE, Embase, Scopus, and ClinicalTrials.gov through October 2025. Across 15 eligible randomized controlled trials evaluating mifepristone for labor induction in singleton pregnancies at 37 weeks or greater (1,063 receiving mifepristone and 811 control participants), mifepristone was associated with significantly reduced odds of cesarean delivery (33.1% vs 41.9%; odds ratio [OR] 0.67; 95% CI, 0.54-0.82). Sensitivity analyses restricted to placebo-controlled, high-quality trials demonstrated a consistent protective effect (OR 0.58; 95% CI, 0.40-0.83). Mifepristone also improved 24-hour Bishop scores, shortened induction-to-delivery time, and decreased requirements for supplemental oxytocin and prostaglandins, without observed increases in postpartum hemorrhage or NICU admissions.
Key takeaways
- Systematic review and meta-analysis synthesized 15 randomized controlled trials comprising 1,874 term singleton pregnancies.
- Mifepristone was associated with a 33% reduction in the odds of cesarean delivery compared with control induction methods (33.1% vs 41.9%, OR 0.67, 95% CI 0.54-0.82).
- In high-quality placebo-controlled trials, the odds of cesarean delivery remained significantly lower (OR 0.58, 95% CI 0.40-0.83).
- Treated patients demonstrated higher 24-hour Bishop scores, shorter induction-to-delivery intervals, and lower oxytocin utilization.
Why this matters on shift
Labor and delivery nurses are essential in monitoring cervical ripening, administering induction pharmacotherapy, and managing prolonged labor. Understanding the physiologic mechanisms and clinical outcomes of progesterone receptor blockade helps perinatal nurses anticipate cervical changes, titrate subsequent oxytocin infusions safely, and support shared decision-making during term inductions.
Bedside takeaway
In a meta-analysis of 15 RCTs (1,874 women), mifepristone for labor induction at >=37 weeks was associated with a 33% reduction in cesarean delivery odds (33.1% vs 41.9%, OR 0.67), higher 24-hour Bishop scores, and lower oxytocin use.
Nursing implications
- Review physician orders and institutional induction protocols when administering ripening agents, perform serial Bishop scoring, maintain continuous fetal heart rate monitoring during active labor, and monitor for uterine tachysystole when combining ripening agents with oxytocin.
Limitations & cautions
- Variable mifepristone dosing regimens across trials; secondary safety endpoints such as postpartum hemorrhage and NICU admission were inconsistently reported across primary studies.
- AI-summarized from the linked source. Review the original article before applying to practice.
Citations · exact source links
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