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Characteristics of children with endoscopically proved chronic bronchitis
Insights
This study found chronic bronchitis (CB) in children often co-occurred with asthma and IgG subclass abnormalities, distinct from adult CB. Diagnosis relied on symptoms and bronchoscopy, not allergies.
Area of Science:
- Pediatric Pulmonology
- Immunology
- Pathology
Background:
- Chronic bronchitis (CB) in children is not well-defined.
- Asthma is frequently diagnosed alongside CB in pediatric patients.
- Understanding CB in children requires evaluating clinical, allergic, pathologic, and immunologic factors.
Purpose of the Study:
- To characterize the clinical, allergic, pathologic, and immunologic features of chronic bronchitis in children.
- To differentiate pediatric CB from adult CB.
- To identify predictors and associated conditions of CB in pediatric populations.
Main Methods:
- Chart review of 20 children diagnosed with CB via bronchoscopic evaluation.
- Endobronchial biopsy in 13 children to document CB.
- Analysis of clinical symptoms, allergy history, and laboratory findings.
Main Results:
- CB in children was associated with asthma, chronicity of symptoms, and poor response to standard treatments.
- Allergy history and systemic inflammation markers did not predict CB.
- IgG subclass abnormalities were frequently observed in pediatric CB.
- Bronchial biopsies showed mononuclear infiltrates and Gram stains revealed white blood cells.
Conclusions:
- Pediatric chronic bronchitis appears distinct from adult CB.
- CB in children is linked to specific immunologic factors like IgG subclass abnormalities.
- Further research is necessary to establish definitive diagnostic criteria for CB in children.
Abstract:
This study evaluated by chart review the clinical, allergic, pathologic, and immunologic characteristics of 20 children found to have chronic bronchitis (CB) by bronchoscopic evaluation, including 13 children in whom CB was documented by endobronchial biopsy. Two additional children likely to have had CB also are described. In this study group, all of the patients were believed to have asthma as well. Chronic bronchitis was predicted by chronicity of symptoms and incomplete response to bronchodilators and corticosteroids, but it was not predicted by a history of allergy or laboratory evidence of systemic infection or inflammation. In the children described herein, CB often was associated with an IgG subclass abnormality. Bronchoscopic evaluation documented CB and provided biopsy and secretion samples. Although the histomorphic findings were heterogeneous, patients with CB usually had white blood cells present on Gram stains of secretions in addition to mononuclear cell infiltrates on biopsy specimens. Chronic bronchitis in these children seems to be distinct from CB in adults. Further studies will be needed to define CB in children.