Objective. To evaluate the impact of choosing the obstetric management for the membranes prelabour rupture at term and immature or insufficiently mature cervix on the course and outcome of labour.

Materials and methods. A retrospective analysis of 103 labour case histories, hospital neonatal records and exchange cards of women with the membranes prelabour rupture at term with an immature and insufficiently mature cervix at the
1st Municipal Clinical Hospital in Minsk was carried out. The main group (1) included 53 pregnant women who had been managed while expected actively and mifepristone appointed after the membranes prelabour rupture had discharged and the control group (2) included 50 women whose labour was induced in 3—4 hours after the membranes prelabour rupture.

Results. The use of the active-expectant management when compared to the active management leads reliably oftener to the spontaneous labour development without using uterotonic drugs (group 1—32.1%, group 2—8.0%, p<0.05), to decreasing of the number of cases and the prostaglandins use duration (group 1—67.9%, 300 (245—360) min; group 2—92.0%, 360 (300—420) min, p<0.05), as well as to decreasing of the number of caesarean section (group 1—24.5%, group 2—44.0%, p<0.05) not affecting the condition of the newborns at birth, the number of complications in the placental stage and postpartum period.

Conclusion. The active-expectant management with the mifepristone prescription can improve the labour outcome in patients with the membranes prelabour rupture with an immature and insufficiently mature cervix.