Pulmonary function in children and adolescents with postinfectious bronchiolitis obliterans

Area of Science:

• Pediatric Pulmonology
• Respiratory Medicine
• Obstructive Lung Diseases

Background:

• Postinfectious bronchiolitis obliterans (PIBO) is a severe sequela of respiratory infections in children.
• Pulmonary function impairment in PIBO can significantly impact long-term health and quality of life.

Purpose of the Study:

• To characterize pulmonary function in children and adolescents diagnosed with PIBO.
• To identify potential risk factors associated with severe pulmonary function impairment in PIBO.

Main Methods:

• Spirometry and plethysmography were used to assess pulmonary function in 77 participants (aged 8-18 years).
• Key parameters analyzed included FVC, FEV1, FEF25-75%, FEV1/FVC, RV, TLC, RV/TLC, and specific airway resistance (sRaw).
• Poisson regression analyzed risk factors: gender, age at first wheeze/diagnosis, asthma history, smoke exposure, and ventilation duration.

Main Results:

• Participants exhibited significant decreases in FEV1 and FEF25-75%, and marked increases in RV and sRaw, indicative of obstructive airway disease.
• Mean affected parameter values: FEV1 (45.9%), FEF25-75% (21.5%), RV (281.1%), RV/TLC (236.2%), and sRaw (665.3%).
• No studied risk factors were significantly associated with severe pulmonary function impairment.

Conclusions:

• PIBO patients present a consistent pattern of severe pulmonary impairment with significant airway obstruction and increased residual volumes.
• Combined spirometry and plethysmography offer a comprehensive approach for assessing and monitoring functional damage in PIBO.
• Commonly identified risk factors for respiratory diseases do not appear to predict the severity of pulmonary impairment in PIBO.