“…In the Cochrane analysis[18], a balloon catheter probably reduces the rate of uterine hyperstimulation combined with FHR (RR 0.35, 95% CI 0.18-0.67), rate of serious neonatal morbidity or perinatal death (RR 0.48, 95% CI 0.25-0.93) and may slightly reduce the rate of aneonatal intensive care unit (NICU) admission (RR 0.82, 95% CI 0.65-1.04). A recent trial conducted by Grace et al published in 2021 [24] reported that the rates of uterine hyperstimulation and foetal distress were lower in DBC group than vaginal prostaglandin group in the rst 12 h. However, a multicentre randomized controlled trial in Australian [10] showed that there were no statistically signi cant differences in the primary outcome variables (a composite neonatal measure comprising nursery admission, intubation/cardiac compressions, acidaemia, hypoxic ischaemic encephalopathy, seizure, infection, pulmonary hypertension, stillbirth or death) and or in the rate of meconium stained liquor (12.6% vs 11.2%, P = 0.647)between DBC group and dinoprostone group (18.6% vs 25.8%; RR = 0.77, 95% CI 0.51-1.02; P = 0.070),but uterine hyperstimulation occurred exclusively in the dinoprostone group (3.0% versus 0%; P = 0.029). Considering that maternal factors and fetal intrauterine conditions would affect neonatal outcomes, Diguisto et al [9] observed no difference in the rate of cesarean delivery due to nonreassuring fetal status for prolonged pregnancies between DBC group and dinoprostone group (5.8% vs 5.3%,95% CI − 2.1-3.1%, p = 0.70).…”