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Airway inflammation and lung function decline in childhood post-infectious bronchiolitis obliterans

Salvatore Cazzato1, Venerino Poletti, Filippo Bernardi

  • 1Department of Pediatrics, University of Bologna, S. Orsola-Malpighi Hospital, Bologna, Italy. salvatore_cazzato@aosp.bo.it

Pediatric Pulmonology
|February 28, 2008
PubMed

Insights

Children with post-infectious bronchiolitis obliterans (PBO) experience significant, worsening airway obstruction. Ongoing inflammation in the lungs may contribute to this decline in pulmonary function over time.

Area of Science:

  • Pediatric Pulmonology
  • Respiratory Medicine
  • Pediatric Infectious Diseases

Background:

  • Post-infectious bronchiolitis obliterans (PBO) is a rare, severe obstructive lung disease in children.
  • Limited data exist on long-term pulmonary function outcomes and the inflammatory mechanisms in pediatric PBO.

Purpose of the Study:

  • To assess the longitudinal changes in lung function in children diagnosed with PBO.
  • To investigate the inflammatory profile of the lungs in PBO patients using bronchoalveolar lavage (BAL).

Main Methods:

  • Longitudinal evaluation of lung function indices in 11 Caucasian children with PBO using mixed-effects models.
  • Analysis of differential cytology and lymphocyte subsets in BAL fluid.
  • Median follow-up duration of 10.2 years.

Main Results:

  • Significant decline observed in FEV1 (1.01%/year), FEF25-75 (1.04%/year), and FEV1/FVC ratio (1.02%/year) from baseline at age 10.
  • Forced vital capacity (FVC) remained abnormally low but did not significantly change over time.
  • BAL analysis revealed elevated neutrophils (median 50%) and lymphocytes (median 14%), indicating persistent inflammation.

Conclusions:

  • Childhood PBO is associated with progressive airway obstruction, leading to deteriorating lung function over time.
  • The persistent inflammatory process, characterized by neutrophilic and lymphocytic infiltration, likely contributes to the decline in pulmonary function in PBO patients.

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