Nalbuphine as a Bridge to Delayed Epidural Analgesia: A Randomized Trial on First-Stage Labor Duration

Area of Science:

• Obstetrics and Gynecology
• Anesthesiology
• Reproductive Medicine

Background:

• Epidural analgesia is commonly used for labor pain management.
• The timing of epidural administration may influence labor progression.
• Nalbuphine is an opioid analgesic with potential benefits in labor.

Purpose of the Study:

• To compare the effect of nalbuphine-assisted delayed epidural analgesia versus early epidural analgesia on the duration of the first stage of labor in nulliparous women.
• To evaluate if delayed analgesia impacts labor duration.
• To assess safety outcomes associated with different epidural timing strategies.

Main Methods:

• A randomized controlled trial involving 120 nulliparous women.
• Participants were assigned to either early epidural analgesia (normal saline) or nalbuphine-assisted delayed epidural analgesia.
• The primary outcome was the duration of the first stage of labor, analyzed using Kaplan-Meier survival curves.

Main Results:

• Nalbuphine-assisted delayed epidural analgesia significantly shortened the first stage of labor compared to early epidural analgesia (HR = 1.629, P < 0.05).
• No significant differences were found in rates of postpartum hemorrhage, oxytocin use, episiotomy, or cesarean section.
• Adverse maternal outcomes such as fever, nausea, and vomiting were comparable between groups.

Conclusions:

• Nalbuphine-assisted delayed epidural analgesia is effective in reducing the duration of the first stage of labor for nulliparous women.
• This approach provides a potential benefit for labor progression without compromising maternal safety.
• Early epidural analgesia, defined as administration at cervical dilation ≤ 3 cm, was used as the comparator.