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Microbial alterations in the lungs of children with chronic pulmonary aspiration
Nadine Freitag1, Tobias Wienemann2, Thi Minh Thao Lea Nguyen1
1Department of General Pediatrics, Neonatology and Pediatric Cardiology, Medical Faculty, University Hospital Düsseldorf, Düsseldorf, Germany.
Insights
Children with chronic pulmonary aspiration (CPA) show distinct lung microbial changes, including increased Enterobacterales and Pseudomonas aeruginosa. These findings highlight the need for targeted interventions to prevent lung damage in pediatric dysphagia patients.
Area of Science:
- Pediatric Pulmonology
- Microbiology
- Immunology
Background:
- Chronic pulmonary aspiration (CPA) is a significant complication of pediatric dysphagia, leading to severe respiratory issues like bronchiectasis.
- The precise mechanisms of aspiration-related lung injury and the role of lung microbiota remain poorly understood.
- Investigating microbial alterations and immune responses in CPA is crucial for understanding disease pathogenesis.
Purpose of the Study:
- To investigate the microbial composition in the lungs of children with CPA.
- To explore the association between lung microbial colonization and immune responses in pediatric CPA.
- To identify potential microbial contributors to aspiration-related lung disease.
Main Methods:
- Retrospective analysis of bronchoalveolar lavage fluid (BALF) from children with CPA and controls.
- Microbial profiling (bacterial, viral, fungal) and immune cell analysis were performed.
- Data collected from patients undergoing bronchoscopy between 2010 and 2022 at University Hospital Düsseldorf.
Main Results:
- The CPA group (48 children) showed altered lung microbial colonization compared to controls (371 children).
- Increased prevalence of Pseudomonas aeruginosa and Enterobacterales was observed in CPA patients.
- Elevated total leukocyte counts were noted in CPA patients, but without significant neutrophilia.
Conclusions:
- Children with CPA exhibit a unique lung microbiome, with higher Enterobacterales and P. aeruginosa colonization.
- These microbial shifts may play a role in the development of aspiration-related lung disease.
- Further research is needed to confirm the direct contribution of microbial colonization to lung damage and long-term outcomes.
Introduction:
Chronic pulmonary aspiration (CPA), a common complication of pediatric dysphagia, poses significant risks to respiratory health, potentially leading to bronchiectasis and permanent lung damage. Despite its clinical impact, the mechanisms underlying aspiration-related lung injury remain unclear. This study investigates the microbial alterations in the lungs of children with CPA and their association with immune responses.
Methods:
We conducted a retrospective analysis of bronchoalveolar lavage fluid (BALF) from children diagnosed with CPA and from controls without swallowing difficulties. Data were collected from patients who underwent bronchoscopy at the University Hospital Düsseldorf between 2010 and 2022. Microbial profiles-including bacterial, viral, and fungal components-and immune cell populations, were assessed to explore the relationship between microbial colonization and immune response in CPA.
Results:
The study included 371 children, of whom 48 had CPA. The CPA group exhibited altered microbial colonization, with an increased prevalence of Pseudomonas aeruginosa and Enterobacterales. While the presence of mixed upper respiratory flora did not differ significantly between groups, pathogenic bacteria were more frequently detected in CPA patients. Notably, total leukocyte counts were elevated in the CPA group, yet neutrophilia was absent.
Discussion:
Our findings suggest that children with CPA have a distinct lung microbial composition, characterized by increased colonization of Enterobacterales and P. aeruginosa. These microbial changes may contribute to the pathogenesis of aspiration-related lung disease. Further research is needed to determine whether microbial colonization directly contributes to lung damage in and assess long-term consequences.
Conclusion:
Microbial dysbiosis in the lungs of children with CPA underscores the need for targeted interventions to prevent or mitigate aspiration-related lung disease. A deeper understanding of microbial colonization in CPA may pave the way for novel therapeutic strategies and improved patient outcomes.
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