Perioperative Use of Atosiban for Ultrasound-indicated Cerclage to Reduce Spontaneous Preterm Birth(sPTB)

After ultrasound-indicated cerclage, some pregnant women still experience sPTB, and there is controversy regarding the use of tocolytic agents during the perioperative period to reduce the incidence of sPTB. In this study, the investigators employed a randomized double-blind method to investigate whether the use of atosiban during the perioperative period can reduce the incidence of sPTB before 34 weeks.