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Cast bronchitis in infants and children
1Department of Pediatrics, Universidad Autonoma, Barcelona, Spain.
Insights
Bronchial casts in children with obstructive bronchitis suggest metaplastic transformation of bronchial epithelium. This metaplasia may be key in the pathophysiology of this condition in pediatric patients.
Area of Science:
- Pediatric Pulmonology
- Respiratory Pathology
Background:
- Obstructive bronchitis in children can present with complex symptoms.
- The presence and significance of bronchial casts in pediatric obstructive bronchitis require further investigation.
Purpose of the Study:
- To investigate the characteristics and potential role of bronchial casts in pediatric obstructive bronchitis.
Main Methods:
- Analysis of bronchial casts found in gastric fluid and expectorated material from children diagnosed with obstructive bronchitis.
- Radiological assessment and histological examination of bronchial casts.
- Biochemical analysis and viral isolation attempts from cast specimens.
Main Results:
- Bronchial casts were identified in 74 children with obstructive bronchitis, with a long-term clinical course observed in most patients.
- Radiological findings included filled bronchi, atelectasis, and emphysema.
- Histologically, casts comprised metaplastic squamous epithelium, with no association found with eosinophilia or elevated IgE, suggesting a non-allergic mechanism.
Conclusions:
- Bronchial cast formation in pediatric obstructive bronchitis is primarily linked to metaplastic transformation of the bronchial epithelium.
- This metaplasia appears to play a significant pathophysiologic role in affected infants and children.
- The findings differentiate cast bronchitis from conditions with extrinsic allergic mechanisms.
Abstract:
Seventy-two children (age range, 3 months to 5.5 years) with a clinical diagnosis of obstructive bronchitis (asthmatoid or spastic bronchitis or bronchiolitis) were found to have bronchial casts in the gastric fluid, and in 2 additional cases casts were spontaneously expectorated in the bronchial exudate. Cast bronchitis had a long-term course of 10 to 24 months in 65 of the 74 patients. Common radiologic findings included bronchi presumably filled with secretions, areas of atelectasis, and lung emphysema of varying degrees. Cast bronchitis did not appear to be associated with eosinophilia and elevated serum IgE levels. Therefore, an extrinsic allergic mechanism is not likely involved in the pathogenesis of the condition. Bronchial casts had varying consistencies; although they were usually soft, they were sometimes rather hard. They were hollow, often ramified, and white and measured from 0.5 to 2 cm in length. Histologically, they consisted of metaplastic squamous epithelium with a varying degree of inflammatory cells and noncellular material. Some differences in biochemical composition were observed between bronchial casts and bronchial exudate of acute catarrhal bronchitis. No viruses could be isolated in 11 cast specimens. Our results suggest that cast formation is mainly related to the metaplastic transformation of the bronchial epithelium and that this metaplasia may play an important pathophysiologic role in certain infants and children with obstructive bronchitis.