Single versus multiple cervical dilation by osmotic dilator before induction of labor for second‐trimester abortion

In this study, we aimed to investigate whether there was a significant prognostic difference between single and multiple cervical dilations when inducing second-trimester abortion.We conducted a retrospective review of 238 pregnant women who underwent termination of pregnancy at 12-21 weeks of gestation at Osaka University Hospital in Osaka, Japan, between January 2010 and May 2018. Termination of pregnancy was performed by vaginal administration of 1 mg gemeprost every 3 h for up to five doses per day after uterine cervical dilation using lamicel.The women were categorized into two groups: 191 women had a delivery time of24 h, whereas 47 had delivery times24 h. Contrasting the groups, there were significant differences with regard to numbers of primiparas (88 [46.1%] and 32 [68.1%], respectively) and lamicel exchanges ± SD (1.9 ± 0.67 for24 h and 2.4 ± 0.87 for24 h, respectively). Additionally, we compared the prognosis of primiparas that received just a single lamicel with that of primiparas that had ≥2 exchanged, but no significant differences were noted in the number of patients with a delivery time of24 h and the number of used gemeprost.Primipara is a risk factor for delayed delivery time of induced abortion. However, increasing the number of exchanged lamicel did not significantly reduce the delivery time; therefore, it should be performed as minimally as possible.