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To quantify the frequency of serious maternal complications associated with cerclage use during pregnancy. We performed a retrospective population-based cohort study of all live births in Ohio from 2006 to 2015. Maternal sociodemographic, medical, and obstetric characteristics were compared for births in which cerclage was utilized during the pregnancy versus those without cerclage. The primary outcome for the study was a composite of adverse outcome including maternal intensive care unit (ICU) admission, blood product transfusion, uterine rupture and unplanned hysterectomy in all births. Secondary outcomes included each of the individual adverse outcomes as well as maternal hospital transfer to a tertiary facility, unplanned operation after delivery and chorioamnionitis. Each outcome was also analyzed separately in singleton and twin births. Generalized linear modeling was used to estimate the relative risk of adverse maternal outcomes associated with cerclage placement after adjustment for coexisting risk factors. Of the 1,428,655 singleton and twin live births in Ohio from 2006 to 2015, 4595 [0.3%] were recorded on the birth certificate as having cerclage during pregnancy. Of those, 11.7% experienced a serious adverse maternal outcome, compared to 3.7% without cerclage, adjRR 2.7 [95% CI 2.5, 3.0]. The rate of the composite maternal adverse outcome was significantly increased for pregnancies with cerclage versus those without overall, and in singleton and twin pregnancies when measured individually [all  p  ≤ .001]. Even after adjustment for coexisting risk factors, cerclage remained significantly associated with composite adverse outcome in each of these groups. Over 1 in 10 women with cerclage experience an adverse maternal outcome. Even after adjusting for gestational age at delivery and other risk factors, maternal risk for serious adverse event remains over twofold increased for pregnancies with cerclage. This information may be helpful in counseling women regarding potential maternal risk when considering neonatal benefit of cerclage in pregnancies at high risk of preterm birth.

Severe maternal morbidity associated with cerclage use in pregnancy