Pregnancy in women with congenital heart diseases: Does the Carpreg II score significantly predict maternal outcomes in congenital heart diseases (PREG-GUCH study)?

Background Management of pregnancy and risk stratification in women with congenital heart diseases (CHD) are challenging especially due to physiological haemodynamic modifications that inevitably occur during pregnancy. Objective To compare the accuracy of the main published scores including CARPREG II score in prediction of maternal complications during pregnancy in CHD patients. Method We included all pregnant women with CHD who delivered their babies after the 20th gestational week in our institution between 2007 and 2018 until 6 months postpartum. Pregnancy scores (CARPREG, CARPREG II, Harris, ZAHARA risk scores and modified WHO (mWHO) risk classification) were applied retrospectively. Results Of 121 pregnancies in 65 CHD patients, 30% had cardiovascular complications. The c-statistic was 0.577 (95% confidence interval (CI): 0.428, 0.727; P = 0.19) for CAPREG score, 0.593 (95% CI: 0.469, 0.717; P = 0.11) for the ZAHARA score, 0.601 (95% CI: 0.402, 0.799; P = 0.15) for Harris score, 0.646 (95% CI: 0.525, 0.767; P Fig. 1 ). Conclusion Even if the new CARPREG II score seems to be better than most of the previously used scores as predictor of adverse maternal cardiovascular events mWHO appears to be more accurate in CHD patients.