What Causes Patent Ductus Arteriosus?

The cause of patent ductus arteriosus (PDA) is not known.

Genetics may play a role. A defect in one or more genes could prevent the ductus arteriosus from closing normally after birth.

PDA is more common in:

• Premature infants (babies born too early)
• Infants with genetic abnormalities such as Down syndrome
• Infants whose mother had German measles (rubella) during pregnancy