Review of Evidence-Based Methods for Successful Labor Induction.
Nicole Carlson, Jessica Ellis, Katie Page and 2 others
PMID 33984171WHAT IT FOUND
Membrane sweeping, cervical balloons, misoprostol, and combined ripening methods are linked with more spontaneous labor or shorter induction, but induced labor often takes longer than spontaneous labor.
Ripen the cervix before starting oxytocin.
Key findings
01Membrane sweeping compared with expectant management promoted spontaneous labor and reduced induction after 42 weeks, without increased maternal or fetal morbidity.
02Combining a cervical balloon with misoprostol was associated with a 1.99 hour shorter induction to birth interval and less uterine hyperstimulation and fewer NICU admissions than misoprostol alone.
03Discontinuing synthetic oxytocin during active labor was associated with lower cesarean birth (9.3% vs 14.7%) and lower uterine tachysystole (6.2% vs 13.1%) than continuing infusion.
STILL TO COME
How it was doneWhat they foundWhat it means for RNs
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What it does not show
This is a review, not a new trial, so it summarizes other studies rather than testing one induction method directly. The search was limited to English publications from January 1, 2015 to October 11, 2020, so older or non-English evidence may be missing. Many findings come from meta-analyses and subgroup analyses, and some studies were underpowered or not designed to answer the outcome being discussed. The review focuses on low-risk people at term, so its conclusions may not apply to higher-risk pregnancies, preterm people, or settings with different induction practices. Optimal oxytocin dosing and maximum dose are not established, and people can respond very differently to the same infusion rate. Induction often uses several methods together, so the contribution of any single component cannot always be separated.
Declared interests
The authors declared no conflicts of interest.
The easy way to misread this
Do not use this review to promise a successful induction or to start oxytocin before the cervix is ripe. The evidence comes from selected low-risk term studies, and the paper says oxytocin should be delayed until cervical ripening is complete because early oxytocin may increase cesarean risk.