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Bronchoalveolar Lavage (BAL) for Research; Obtaining Adequate Sample Yield
Published on: March 24, 2014
Interlobar differences in bronchoalveolar lavage fluid from children with cystic fibrosis
J P Gutierrez1, K Grimwood, D S Armstrong
1Dept of Respiratory Medicine, Murdoch Children's Research Institute, Parkville, Victoria, Australia.
Insights
Bronchoalveolar lavage in cystic fibrosis (CF) children reveals uneven bacterial spread. Sampling one lung lobe may not represent the entire lung, highlighting the need for multi-site sampling in CF research.
Area of Science:
- Pediatric Pulmonology
- Infectious Diseases
- Medical Research Methodology
Background:
- Bronchoalveolar lavage (BAL) in specialist centers has advanced understanding of infant cystic fibrosis (CF) lung disease.
- Current research often samples only a single lung lobe.
- The generalizability of single-lobe BAL findings to other lung segments in pediatric CF patients is uncertain.
Purpose of the Study:
- To determine if bronchoalveolar lavage (BAL) results from one lung lobe can be generalized to other segments in children with cystic fibrosis (CF).
- To investigate the distribution of bacterial load and inflammatory markers across different lung lobes in pediatric CF patients.
Main Methods:
- Sequential bronchoalveolar lavage (BAL) was performed on the right middle and lingula lobes of 33 children with CF (aged 1.5-57 months).
- Specimens underwent quantitative bacteriology, cytology, and cytokine analysis.
- Bacterial counts, inflammatory indices, and interleukin-8 (IL-8) concentrations were compared between lobes.
Main Results:
- Significant bacterial presence (≥1 x 10^5 cfu/mL) was found in 27% of subjects, with some cases localized to a single lobe.
- Children with high bacterial counts showed similar inflammatory indices in both sampled lobes.
- Interleukin-8 (IL-8) levels in the lingula lobe were significantly higher in children with high bacterial counts compared to those with lower counts.
- Lingula neutrophil and IL-8 levels correlated with right middle lobe bacterial counts, suggesting inhomogeneous bacterial distribution.
Conclusions:
- Bacterial distribution in the lungs of children with cystic fibrosis (CF) can be inhomogeneous.
- Bronchoalveolar lavage (BAL) findings from a single lung lobe may not accurately represent the entire lung.
- Sampling multiple lung sites during BAL in pediatric CF patients is crucial for comprehensive assessment.
Abstract:
Bronchoalveolar lavage (BAL) performed in specialist centres has improved the understanding of infant cystic fibrosis (CF) lung disease. As most researchers sample from a single lobe, it was determined whether BAL results could be generalized to other lung segments. Thirty-three CF children, aged 1.5-57 months, underwent in random order sequential BAL of their right middle and lingula lobes. Specimens from each lobe had separate quantitative bacteriology, cytology and cytokine analysis. Bacterial counts > or = 1 x 10(5) colony forming units (cfu) x mL(-1) were observed in nine (27%) subjects, including six involving only the right middle lobe. These six children had similar inflammatory indices in their right middle and lingula lobes, and interleukin (IL)-8 concentrations in the latter were significantly higher than that observed within the lingula lobes of the 24 CF children with bacterial counts < 1 x 10(5) cfu x mL(-1). Lingula neutrophil and IL-8 levels correlated best with right middle lobe bacteria numbers. This observational study in cystic fibrosis children suggests that while inflammation is detected in both lungs, bacterial distribution may be more inhomogeneous. Bronchoalveolar lavage microbiological findings from a single lobe may therefore, not be generalized to other lung segments. When performing bronchoalveolar lavage in cystic fibrosis children, it is important to sample from multiple sites.
