A ductus arteriosus that failed to close at birth; may require surgical correction WordNet 3.0 & Open English WordNet

Patent ductus arteriosus is a medical condition in which the ductus arteriosus fails to close after birth: this allows a portion of oxygenated blood from the left heart to flow back to the lungs through the aorta, which has a higher blood pressure, to the pulmonary artery, which has a lower blood pressure. Wikipedia

A heart defect Wikipedia Disambiguation

Condition wherein the ductus arteriosus fails to close after birth Wikidata

Pathology consisting in that the foetal communication between the pulmonary artery and the aorta has not been closed. OmegaWiki