Objective: This study was to compare pregnancy outcomes between cerclage and expectant management in wemen with a dilated cervix.
Design: Retrospective multicenter cohort study.
Setting: Five hospitals of Catholic University Medical Center Network in Korea.
Population: A total of 173 women between 14 0/7 and 29 6/7 weeks' gestation with cervical dilation of 1 cm or greater by digital examination.
Methods: Pregnancy outcomes were compared according to cerclage or expectant management, with the use of propensity-score matching.
Main outcome measures: Primary outcome was time from presentation until delivery (weeks). Secondary outcomes were gestational age at delivery, neonatal survival, morbidity, preterm birth, and so on.
Results: Of 173 women, 116 received a cerclage (cerclage group), and 57 were managed expectantly without cerclage (expectant group). Cervical dilation at presentation, and the use of amniocentesis performed to exclude subclinical chorioamnionitis differed between two groups. In the overall matched cohort, there was significant difference in the time from presentation until delivery (cerclage vs. expectant group, 10.6±6.2 vs. 2.9±3.2 weeks, p <0.0001). While there was no significant difference in the neonatal survival between two groups, there were lower neonatal morbidity as well as higher pregnancy maintenance rate at 28, 32, 34 and 37 weeks' gestation in the cerclage group, compared with the expectant group.
Conclusion: This study suggests that digital examination-indicated cerclage appears to prolong gestation and decrease neonatal morbidity, compared with expectant management in women with cervical dilation between 14 0/7 and 29 6/7 weeks.
Keywords: Cerclage; Cervical dilation; Preterm birth.