Like other congenital heart defects, ventricular septal defect occurs during fetal development. The cause is unknown, but genetics may play a role. If members of your family have ventricular septal ...

For all 129 fetuses, karyotyping and an ultrasound examination had been performed ... The malformations in order of frequency were: ventricular septal defect (VSD) (28%), atrioventricular septal ...