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Early versus late amniotomy for labour induction: a randomized controlled trial.

Karine Gagnon-Gervais¹, Emmanuel Bujold, Marie-Hélène Iglesias

¹Department of Obstetrics and Gynecology, CHU Sainte-Justine Research Center, Université de Montréal, Montreal, Quebec, Canada.

The Journal of Maternal-Fetal & Neonatal Medicine : the Official Journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians

|May 24, 2012

Summary

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Early amniotomy (EA) shortens labor for nulliparous women undergoing oxytocin induction without increasing cesarean rates. This study compared EA to late amniotomy (LA) in labor induction.

Area of Science:

Obstetrics and Gynecology
Reproductive Medicine

Background:

Induction of labor is a common obstetric procedure.
The timing of amniotomy during oxytocin induction may influence labor outcomes.

Purpose of the Study:

To compare the effects of early amniotomy (EA) versus late amniotomy (LA) on delivery mode.
To assess the impact of amniotomy timing on labor duration and intrapartum fever during induced labor.

Main Methods:

A randomized controlled trial involving 143 women undergoing labor induction with oxytocin.
Participants were randomized to EA (concurrent with oxytocin initiation) or LA (4 hours after oxytocin initiation).
Outcomes included cesarean delivery rate, labor duration, and intrapartum fever, stratified by parity.

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Main Results:

Cesarean delivery rates were similar between EA and LA groups for both nulliparous (18% vs. 17%) and parous women (3% vs. 0%).
Early amniotomy was associated with a significantly shorter oxytocin-to-delivery interval in nulliparous women (12 vs. 15 hours).
A non-significant trend towards reduced intrapartum fever was observed with EA in nulliparous women (3% vs. 25%).

Conclusions:

Early amniotomy during oxytocin induction shortens labor duration in nulliparous women.
The timing of amniotomy does not affect the risk of cesarean section in women undergoing labor induction, regardless of parity.