A study of pregnant women with heart disease has yielded a new risk index that improves on its predecessor by integrating general, lesion-specific, and delivery-of-care variables, investigators say.
“Compared with other published risk indices, including the original CARPREG [Cardiac Disease in Pregnancy] score, CARPREG II risk index had the highest discriminative and calibrative accuracy in our study group,” investigators said in a report published in the Journal of the American College of Cardiology.
First author on the report was Candice K. Silversides, MD, division of cardiology, University of Toronto pregnancy and heart disease research program, Mount Sinai Hospital/Sinai Health System.
The widely used, original CARPREG risk index was the first to predict maternal cardiac complications based on general clinical and echocardiographic data from the baseline antepartum visit, the researchers wrote in their report.
The new index developed by Dr. Silversides and her colleagues stems from a study of pregnant women with heart disease receiving care at two large Canadian obstetric centers.
Based on analysis of 1,938 pregnancies progressing beyond 20 weeks of gestation, the investigators found that cardiac complications were overall quite common in pregnant women with heart disease, occurring in 16% of participants. However, maternal cardiac deaths or cardiac arrests were rare, they said, occurring in just 11 (0.6%) of the pregnancies.
Most complications (64%) occurred in the antepartum period, according to the report.