Objective: To evaluate the efficacy of induction of labour in obese women using sequential double-balloon catheter and oral misoprostol in comparison with oral misoprostol alone.
Study design: In this cohort study, 400 pregnant women with BMI higher than 35 kg/m2 undergoing labour induction at term were included. Induction of labour with a double-balloon catheter and, if necessary, sequential oral misoprostol (n = 216) was compared to oral misoprostol alone (n = 184). The primary outcome measure was the caesarean section rate. Secondary outcome parameters were, among others, the induction-to-delivery-interval, the rate of vaginal delivery within 24 and 48 h as well as fetal outcome parameters.
Results: The caesarean section rate was significantly lower in the group with sequential use of double-balloon catheter and oral misoprostol (27.6% versus 37.5%, p = 0.0345). After stratification for parity this reduction was seen especially in nulliparous (38.6% versus 56.9%, p = 0.0039). The rate of abnormal CTG was significantly lower as well (19.9% versus 30.4%, p = 0.0150), particularly in nulliparous (25.9% versus 40.4%, p = 0.0138). Uni- and multivariable analyzes showed that the caesarean section rate was significantly influenced by the method of induction of labour (p = 0.0026), parity (p < 0.0001) and Bishop score (p = 0.0425).
Conclusion: In obese women, induction of labour with sequential use of double-balloon catheter and oral misoprostol is associated with significantly more normal vaginal deliveries and less caesarean sections.
Keywords: Body mass index; Double-balloon catheter; Induction of labour; Misoprostol; Sequential use.