High- vs low-dose oxytocin protocols for labor induction: a systematic review and meta-analysis

Area of Science:

• Obstetrics and Gynecology
• Reproductive Medicine
• Perinatal Care

Background:

• Induction of labor is a common obstetric procedure.
• Oxytocin is the primary agent used for labor induction.
• Optimal oxytocin dosing protocols remain a subject of investigation.

Purpose of the Study:

• To systematically review and synthesize evidence on maternal and neonatal outcomes comparing high-dose versus low-dose oxytocin for labor induction.
• To evaluate the impact of different oxytocin dosing strategies on cesarean delivery rates and other key obstetric outcomes.

Main Methods:

• Systematic review of randomized and observational studies.
• Searched multiple databases (PubMed, Embase, Scopus, CINAHL, Cochrane) and ClinicalTrials.gov.
• Included studies comparing specific low-dose and high-dose oxytocin protocols for labor induction.
• Extracted data and assessed risk of bias using PRISMA guidelines and Cochrane tools.
• Calculated pooled relative risks for primary (cesarean delivery) and secondary outcomes using random-effects models.

Main Results:

• Six studies (7850 deliveries) were included, with all studies having medium or high risk of bias.
• No significant difference in cesarean delivery rates between high-dose and low-dose oxytocin protocols (26.0% vs 28.4%).
• High-dose oxytocin was associated with a significantly lower frequency of postpartum hemorrhage (7.6% vs 9.9%).
• No differences observed in spontaneous vaginal delivery, operative vaginal delivery, duration of labor, uterine tachysystole, or neonatal morbidity.

Conclusions:

• Current evidence suggests no difference in cesarean delivery rates between high-dose and low-dose oxytocin for labor induction.
• High-dose oxytocin may reduce the risk of postpartum hemorrhage.
• Significant methodological limitations and a need for high-quality trials exist to establish optimal oxytocin dosing for labor induction.