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Inhaled nitric oxide to prevent bronchopulmonary dysplasia in preterm neonates

Jean-Christophe Mercier1, Paul Olivier, Gauthier Loron

  • 1Service d'Accueil des Urgences pédiatriques, Hôpital Robert Debré, Assistance Publique - Hôpitaux de Paris & Faculté de Médecine, Université Paris 7 Denis Diderot, Paris, France. jean-christophe.mercier@rdb.aphp.fr

Seminars in Fetal & Neonatal Medicine
|November 7, 2008
PubMed

Insights

Inhaled nitric oxide may help prevent chronic lung disease in premature infants, potentially improving both lung and brain development. Further research is ongoing to confirm its benefits and identify optimal patient subsets.

Area of Science:

  • Neonatal Medicine
  • Pulmonology
  • Neuroscience

Background:

  • Bronchopulmonary dysplasia (BPD) is a significant cause of morbidity and mortality in premature infants.
  • Advances in respiratory support have led to a 'new BPD' characterized by chronic oxygen dependency without severe acute respiratory distress, possibly due to impaired lung growth.
  • The vascular endothelial growth factor/nitric oxide (VEGF/NO) pathway is implicated in lung development, but clinical data on inhaled nitric oxide (iNO) for BPD are inconclusive.
  • Neurological complications like intracranial hemorrhage are common in extremely premature infants, and iNO has shown potential neuroprotective effects in some trials.

Purpose of the Study:

  • To investigate the role of inhaled nitric oxide in preventing bronchopulmonary dysplasia in premature infants.
  • To assess the impact of iNO on both long-term lung and brain outcomes in this vulnerable population.
  • To clarify the potential benefits of iNO for specific subsets of premature infants.

Main Methods:

  • The study refers to the European Nitric Oxide or 'EUNO' trial, a randomized clinical trial.
  • The primary endpoint is the reduction of chronic oxygen dependency at 36 weeks' postconceptional age.
  • Long-term follow-up of lung and brain development until 7 years of age is included.

Main Results:

  • Experimental studies suggest the VEGF/NO pathway is crucial for pulmonary angiogenesis and lung growth.
  • Clinical studies on iNO for BPD have yielded inconclusive results regarding its efficacy.
  • Recent trials indicate iNO may reduce neurological events and improve outcomes in some premature infants.
  • Our group's research shows iNO has remote effects on brain angiogenesis and maturation in rodent pups.

Conclusions:

  • The precise role and optimal use of inhaled nitric oxide in preventing BPD and its associated neurological complications require further investigation.
  • The EUNO trial results are anticipated to provide critical insights into the long-term efficacy of iNO for both lung and brain development in premature infants.
  • Identifying specific patient groups who benefit most from iNO therapy is essential for its clinical application.

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