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Patent ductus arteriosus complicating the respiratory distress syndrome in preterm infants
Insights
Persistent ductus arteriosus (PDA) in preterm infants with respiratory distress syndrome (RDS) can cause heart failure, even without a murmur. Early detection of massive cardiomegaly in severe RDS is crucial for timely intervention.
Area of Science:
- Neonatal Medicine
- Pediatric Cardiology
- Respiratory Distress Syndrome
Background:
- Patency of the ductus arteriosus (PDA) is common in preterm infants with respiratory distress syndrome (RDS).
- PDA can lead to significant cardiovascular complications, including heart failure and cardiomegaly.
- The clinical presentation of PDA-induced heart failure can vary, sometimes preceding the development of a heart murmur.
Purpose of the Study:
- To investigate the relationship between PDA, RDS severity, and the development of heart failure in preterm infants.
- To determine the diagnostic utility of aortography and clinical findings in assessing PDA and associated shunting.
- To establish criteria for surgical intervention in cases of PDA with severe cardiovascular compromise.
Main Methods:
- A study of 46 preterm infants diagnosed with RDS.
- Assessment of PDA patency using single-film aortography and clinical evaluation, confirmed surgically.
- Correlation of aortogram-derived left-to-right shunt estimations with heart size and clinical signs of heart failure.
- Categorization of infants based on RDS severity (severe vs. mild/moderate) and presence of massive cardiomegaly.
Main Results:
- Aortographic estimation of left-to-right shunt through PDA correlated well with heart size and clinical heart failure.
- Massive cardiomegaly and heart failure associated with PDA occurred in 14 infants, preceding a heart murmur in these cases.
- Massive cardiomegaly developed significantly earlier in infants with severe RDS (12 infants) compared to those with mild/moderate RDS (34 infants).
Conclusions:
- PDA is a significant concern in preterm infants with RDS, potentially leading to heart failure and cardiomegaly.
- The absence of a heart murmur does not rule out significant PDA with heart failure.
- Ductal ligation is recommended for infants with massive cardiomegaly, requiring IPPV, and aortographic evidence of complete contrast diversion to pulmonary arteries, indicating a large left-to-right shunt.
Abstract:
In 46 preterm infants with RDS the patency of the ductus arteriosus was established by single film aortography or by clinical diagnosis and confirmation at surgery. The estimated left-to-right shunt through the PDA by aortogram correlated well with the heart size and the clinical diagnosis of heart failure. In 14 infants massive cardiomegaly and heart failure with a PDA occurred before the appearance of a heart murmur. Twelve infants had severe RDS and 34 had mild or moderate RDS. Massive cardiomegaly occurred significantly earlier in infants with severe RDS. It is suggested that ductal ligation is indicated when an infant with massive cardiomegaly requires IPPV and whose aortagram shows that all of the contrast material is in the pulmonary arteries and none in the aortic arch. A heart murmur may or may not be present.