Interatrial defect and patent ductus arteriosus.

We greatly appreciated the letter to the Editor by Rana Olgunturk and Serdar Kula. We can say that his interpretation coincides with our interpretation and with the knowledge about patent ductus arteriosus (PDA) and secundum atrial septal defects. Although functional closure of PDA usually occurs in the first few hours of life in healthy infants born at term (about 15 h of life in healthy infants born at term), true anatomic closure, in which the ductus loses the ability to reopen, may take several weeks. Persistent, patency for up to 10 days after birth is encountered in premature infants. The male Italian newborn infant of the cited case report was referred at the age of 2 days to the Cardiology Unit for a cardiovascular check-up (in the text: "in a 3-day-old newborn infant" must be comprehended as "in a 2-day-old newborn infant") and was mature. Interatrial septal shunts in newborns are frequently encountered. Since there are no definitive diagnostic criteria for both patent foramen ovale and secundum atrial septal defects, it is difficult to differentiate these two lesions by echocardiography, particularly in the early newborn period. Some authors, called these two lesions as "interatrial septal openings". The diagnosis, in the case report cited, was made not only on the basis of the first observation but also on the basis of the persistence of abnormalities during the long-term follow-up and therefore the infant was referred to a pediatric heart surgical unit were the abnormalities were confirmed.
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