Randomized controlled trial of prolonged second stage: extending the time limit vs usual guidelines

Area of Science:

• Obstetrics and Gynecology
• Maternal-Fetal Medicine
• Clinical Trial Research

Background:

• Historical guidelines for prolonged second stage labor lack robust evidence.
• Current data on maternal/neonatal outcomes with prolonged second stage labor are conflicting.
• No randomized controlled trials (RCTs) exist on extending labor beyond current recommendations.

Purpose of the Study:

• To assess if extending labor in nulliparous women with prolonged second stage impacts cesarean delivery rates.
• To evaluate the effect of extended labor on maternal and neonatal outcomes.
• To provide evidence-based guidance for managing prolonged second stage labor.

Main Methods:

• RCT involving nulliparous women with singleton gestations and prolonged second stage labor.
• Defined prolonged second stage as 3 hours (epidural) or 2 hours (no epidural).
• Randomized to extended labor (≥1 additional hour) or usual labor (expedited delivery).

Main Results:

• Seventy-eight women were randomized; all received epidural anesthesia.
• Cesarean delivery incidence was 19.5% in the extended labor group vs. 43.2% in the usual labor group.
• No significant differences in maternal or neonatal morbidity were observed.

Conclusions:

• Extending labor in nulliparous women with prolonged second stage significantly halved cesarean delivery rates.
• No significant differences in maternal or neonatal morbidity were detected.
• The study was underpowered to detect small, clinically significant differences in morbidity.