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Lung function in cystic fibrosis: acute effect of salbutamol
Insights
Volume of trapped gas (VTG) is the most sensitive indicator of lung abnormality in children with cystic fibrosis (CF). Pulmonary function tests showed widespread abnormalities, but salbutamol did not improve lung function.
Area of Science:
- Pediatric Pulmonology
- Respiratory Medicine
- Cystic Fibrosis Research
Background:
- Cystic Fibrosis (CF) affects multiple organs, particularly the lungs, leading to progressive respiratory dysfunction.
- Early detection of lung disease in pediatric CF patients is crucial for timely intervention.
- Standard pulmonary function tests (PFTs) may not fully capture the extent of early lung disease in children.
Purpose of the Study:
- To evaluate the sensitivity of various pulmonary function tests, including volume of trapped gas (VTG), in detecting lung abnormalities in children with CF.
- To assess the impact of salbutamol inhalation on lung function in this pediatric cohort.
- To determine the relationship between age and lung function parameters in children with CF.
Main Methods:
- Conducted pulmonary function tests (spirometry, N2 washout, VTG) on 12 children (6-18 years) with CF before and after salbutamol.
- Analyzed parameters including VTG, lung clearance index (LCI), V'max 25/TLC, residual volume, and FEV1.
- Correlated lung function parameters with age and clinical scores.
Main Results:
- Pathologically increased VTG was observed in 11 out of 12 children.
- Abnormalities were also noted in LCI (9 children), V'max 25/TLC (8 children), residual volume (6 children), and FEV1 (2 children).
- VTG/TLC% showed an age-related increase, while V'max 25/TLC and FEV1 did not change significantly; no improvement in lung function was observed after salbutamol.
Conclusions:
- Volume of trapped gas (VTG) demonstrated the highest sensitivity in identifying lung abnormalities in children with cystic fibrosis.
- Standard PFTs like FEV1 may underestimate the extent of lung disease in this population.
- Salbutamol did not elicit a bronchodilator response in the studied pediatric CF group, suggesting limited utility in this context.
Abstract:
Pulmonary function tests including spirometry, N2 washout and volume of trapped gas (VTG) were obtained in 12 children with cystic fibrosis (CF), 6-18 years of age, before and after inhalation of 0.2 mg salbutamol. 11 children had pathologically increased VTG while the lung clearance index (LCI) was abnormal in 9, V'max 25/TLC (maximal flow at 25% of vital capacity/total lung capacity) in 8, residual volume in 6, but FEV1 in only 2 children. VTG/TLC% increased with age while V'max 25/TLC and FEV1 did not change. Neither was clinical score related to age in our subjects. No improvement in lung function occurred after salbutamol inhalation. VTG proved most sensitive for showing abnormality in children with CF.