Labour in women with gestational diabetes mellitus.

OBJECTIVES: Gestational diabetes mellitus (GDM) constitutes one of the most common pregnancy complications and affects 3-5% of all pregnancies, with its incidence still growing. Due to possible maternal and fetal complications, the peripartum management of GDM patients continues to be a debatable issue. The aim of the study was to analyse the course and final way of delivery in women with gestational diabetes mellitus. The effectiveness of induction of labour (IOL) was also assessed and factors predisposing to cesarean section were identified.

MATERIAL AND METHODS: The study group consisted of 204 women with GDM who delivered in the Academic Centre for Woman's and Neonate's Health in Warsaw over the years 2013 and 2014. The indications and ratios of elective and intrapartum cesarean sections were analysed. Patients qualified for induction of labour were compared depending on their final way of delivery.

RESULTS: Over a half of all deliveries in the study group (53%) were cesarean sections. Elective surgeries accounted for 70% of all cesarean sections, predominantly due to a history of previous operational deliveries. Only 12% of the study group developed spontaneous uterine contractions and delivered vaginally. A comparison of the vaginal delivery group (n = 96) with cesarean section group (n = 108) pointed to high pregestational BMI value and advanced maternal age as factors increasing the patient's risk for surgical delivery (p = 0.0000 and p = 0.048 accordingly). The comparison of women undergo-ing IOL vs. omen with spontaneous uterine contractions showed no increase in the ratio of intrapartum cesarean sections in the IOL group - in both subgroups vaginal delivery was achieved in 75% of cases.

CONCLUSIONS: Patients with GDM are more likely to undergo cesarean section, but the implementation of induction of labour at term does not further aggravate this risk. Major risk factors for operational delivery in GDM population included: advanced maternal age, high pregestational BMI value and undergoing insulin therapy.