Natural Cervical Ripening to Prevent Pharmacological Induction of Labor - a Pilot Study.

Approximately 25% of vaginal births currently occur following induction of labor (IOL). At the University Hospital Zurich, internal guidelines recommend IOL at 40 weeks of gestation for women with non-insulin-dependent, diet-controlled gestational diabetes. However, IOL may be associated with side effects and a less positive birth experience. Alternative, natural methods for cervical ripening in an outpatient setting may help promote spontaneous labor onset and reduce the need for medical induction.

This investigator-initiated, mono-centric, prospective, randomized controlled trial aims to evaluate the effectiveness, safety, and feasibility of natural cervical ripening methods, specifically nipple stimulation (breast massage/colostrum harvesting) and membrane sweeping. The primary objective is to assess whether these interventions shorten the time from 37 weeks of gestation (start of intervention) to the onset of spontaneous labor.

The primary endpoint is the time interval between 37 weeks' gestation and spontaneous onset of labor. Secondary endpoints include the rate of spontaneous labor before planned IOL, oxytocin use during childbirth, use of pharmacological induction agents, duration of hospitalization, postpartum hemorrhage (>500 ml), mode of birth, patient satisfaction with the intervention/induction and birth experience, and neonatal outcomes.

The study includes 74 pregnant women aged ≥18 years with singleton pregnancies, diet-controlled gestational diabetes, planned vaginal birth, and scheduled IOL at 40 weeks, who can communicate in German or English and have provided informed consent. Key exclusion criteria include multiple gestation, fetal growth abnormalities, insulin-dependent diabetes, planned cesarean section, onset of labor prior to enrollment, or inability to comply with study procedures.

Participants are randomized to either an intervention group or a control group. The intervention group receives membrane sweeping twice weekly by medical personnel from 37 weeks, breast massage/nipple stimulation performed by the participant for 60 minutes on three days per week, and standard colostrum harvesting beginning at 36 weeks. The control group receives standard care only, consisting of colostrum harvesting twice daily from 36 weeks, which is already routine practice at the institution.