Occurrence risk for congenital heart defects in relatives of patients with aortic stenosis, pulmonary stenosis, or ventricular septal defect.

Knowledge of the risk of occurrence of congenital heart defects in offspring of individuals with a congenital heart defect is important for genetic counseling and understanding the etiology of congenital heart diseases.A portion of the questionnaire mailed to all patients in the Second Natural History Study of Congenital Heart Defects (NHS-2) addressed marital status, pregnancy, miscarriage, and presence or absence of congenital heart defects or...