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Misoprostol as a labor induction agent
P M Magtibay1, K D Ramin, D Y Harris
1Department of Obstetrics and Gynecology, Mayo Clinic, Rochester, Minnesota 55905, USA.
The Journal of Maternal-Fetal Medicine
|March 21, 1998
Summary
Misoprostol effectively ripens the cervix and induces labor, proving more economical than prostaglandin E2 (PGE2) and oxytocin. This labor induction method showed faster delivery times with no adverse perinatal outcomes.
Area of Science:
- Obstetrics and Gynecology
- Reproductive Medicine
- Clinical Pharmacology
Background:
- Labor induction is frequently required for post-term pregnancies and other maternal or fetal indications.
- Cervical ripening agents play a crucial role in successful labor induction, particularly with an unfavorable cervix.
- Prostaglandin E2 (PGE2) is a standard agent, but its efficacy, safety, and cost-effectiveness are continually evaluated against alternatives.
Purpose of the Study:
- To compare the efficacy, safety, and cost of intravaginal misoprostol versus a standard protocol of prostaglandin E2 (PGE2) and intravenous oxytocin for labor induction.
- To assess the impact of misoprostol on cervical ripening, induction-to-delivery times, and cesarean section rates.
- To evaluate the incidence of adverse events, specifically tachysystole, in both treatment groups.
Main Methods:
- A prospective randomized study involving 38 patients requiring labor induction with an unfavorable cervix (Bishop score ≤ 5).
- Patients were randomized to receive either 50 mcg intravaginal misoprostol every 4 hours or a single dose of 0.5 mg PGE2 gel followed by oxytocin infusion.
- Bishop scores were assessed in a blinded manner, and clinical outcomes including delivery times and cesarean rates were compared.
Main Results:
- Misoprostol significantly improved Bishop scores (median change of 4) compared to the control group (median change of 1) (P < 0.001).
- A higher proportion of women in the misoprostol group delivered within 36 hours (88%) compared to controls (47%) (P = 0.01).
- Tachysystole occurred more frequently in the misoprostol group (8 patients) than in the PGE2/oxytocin group (0 patients) (P < 0.01), with no perinatal morbidities reported in either group.
Conclusions:
- Intravaginal misoprostol is an effective and economical agent for cervical ripening and labor induction.
- Misoprostol demonstrates superior efficacy in improving cervical favorability and reducing induction-to-delivery time compared to PGE2/oxytocin.
- While associated with increased tachysystole, misoprostol appears safe for labor induction when managed appropriately, offering a cost-effective alternative.