Cervical ripening and induction of labor by prostaglandin E2: a comparison between intracervical gel and vaginal pessary

Abstract

Objective: To compare the effectiveness and safety of two formulations of prostaglandin (PG) E2 (gel and pessary) for induction of labor. Primary outcomes were cervical ripening, initiation/duration of labor, and type of delivery.Study design: A total of 115 women with singleton gestations were consecutively enrolled and assigned to receive intracervical PGE2 (dinoprostone0.5 mg) by gel (n = 66) or PGE2 (dinoprostone 10 mg) by intravaginal pessary (n = 49).Results: Independently from parity, the vaginal pessary induced successful cervicalripening with a slightly higher but not statistically significant occurrence of vaginal delivery with respect to gel induction. The mean time interval from induction to vaginal delivery did not differ betweengroups, despite being shorter for the pessary group in inducation-delivery intervals > 12 h. No significant differences were found between the groups with respect to patients who required a second courseof PGE2 (9% vs. 2%), as well as oxytocin (11% vs. 13%) induction. No significant difference was found in the incidence of uterine hyperstimulation and other adverse reactions in nulliparas, orin fetal and neonatal outcome.Conclusion: Independently from parity, both PGE2 administration routes appeared to be effective in achieving cervical ripening, initiation of labor andoptimal type of delivery, and showed the same incidence of side-effects.