Low exhaled nitric oxide in school-age children with bronchopulmonary dysplasia and airflow limitation

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Eugenio Baraldi1, Gea Bonetto, Franco Zacchello

  • 1Department of Pediatrics, School of Medicine, University of Padova, Via Giustiniani 3, 35128 Padova, Italy. baraldi@pediatria.unipd.it

American Journal of Respiratory and Critical Care Medicine
|October 13, 2004
PubMed

Insights

School-age survivors of bronchopulmonary dysplasia (BPD) exhibit persistent airflow limitation. Unlike asthma patients, these children show low exhaled nitric oxide (FeNO) levels and no response to beta(2)-agonists, suggesting unique airway pathology.

Area of Science:

  • Pediatric Pulmonology
  • Respiratory Medicine
  • Neonatology

Background:

  • Bronchopulmonary dysplasia (BPD) is a chronic lung disease in premature infants.
  • BPD survivors may experience long-term airflow limitation and asthma-like symptoms.
  • The underlying pathological mechanisms of these respiratory issues remain unclear.

Purpose of the Study:

  • To investigate exhaled nitric oxide (FeNO) levels and lung function in school-age survivors of BPD.
  • To compare respiratory parameters in BPD survivors with healthy controls and children with asthma.

Main Methods:

  • Measured FeNO and performed lung function tests (including FEV1) in 31 school-age BPD survivors.
  • Compared results with healthy term-born controls, preterm children without BPD, and 31 children with asthma.

Main Results:

  • BPD survivors displayed airflow obstruction (mean FEV1 77.8% predicted), unresponsive to beta(2)-agonists in 72%.
  • FeNO levels in BPD survivors (7.7 ppb) were significantly lower than in healthy controls (10.7 ppb) and preterm children without BPD (9.9 ppb).
  • BPD survivors had FeNO levels four times lower than children with comparable airflow limitation due to asthma (24.9 ppb).

Conclusions:

  • School-age BPD survivors exhibit airflow limitation with low FeNO and lack of bronchodilator reversibility.
  • These findings differ from asthma and suggest airway pathology related to early-life structural changes in BPD.
  • Low FeNO may indicate distinct inflammatory or structural pathways in BPD-related chronic lung disease.

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