Increased cesarean section rate and premature birth according to modified WHO maternal cardiovascular risk in pregnant women with congenital heart disease

Abstract

Abstract Background During pregnancy and delivery, hemodynamics are altered, and women with adult congenital heart disease (ACHD) might have a higher risk of obstetric and neonatal complications. We sought to investigate pregnancy outcome and complications in relation to complexity of heart condition. Materials and methods We studied women with ACHD discussed at multidisciplinary conferences March 2009-May 2021. We studied 149 pregnancies in 101 women. We scored each woman retrospectively according to the modified World Health Organization (mWHO) risk classification and included patients in risk class I (n=36, 24.1%), II (n=43, 28.9%), II-III (n=43, 28.9%), III (n=24, 16.1% and IV (n=3, 2.0%). Relative risks were assessed with logistic regression adjusting for parity and age. Results Women with mWHO class ≥III underwent cesarean section more often than women in less complex mWHO classes, p<0.001. Women in mWHO classes I, II and II-III were 83.8% (CI 54.4%-94.2% p<0.001) less likely to give birth prematurely compared to women in mWHO classes III and IV. We found no difference in incidence of preeclampsia, gestational hypertension, gestational diabetes or hemorrhage >1000 ml depending on WHO-class (table 1). Women in mWHO classes III-IV had a higher rate of fetal growth restriction compared to women in mWHO classes I, II, II-III (p<0.007). Conclusions Women with complex congenital heart disease (mWHO ≥III) tend to have a higher rate of cesarean section, premature birth and fetal growth restriction.Table 1