Young women with heart disease are increasingly being seen in obstetrical referral centres owing, in large part, to the dramatic improvements in survival of young adults with congenital heart disease in recent years. Although pregnancies in most women with heart disease result in favourable outcomes, there are important exceptions that must be recognized. These exceptions pose a significant mortality risk to the mother and/or the fetus. The present article provides a general framework for the classification of congenital heart lesions in pregnant women as well as a detailed lesion-specific review.
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