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[The role of the small airways in childhood asthma]
J-C Dubus1, J de Blic, K Mezzi
1Unité de Médecine-Infantile, CHU Timone-Enfants, UPRES 3287, IFR 125, Marseille Cedex 5.
Insights
Childhood asthma involves inflammation and structural changes in small airways, persisting throughout life. New therapies are needed to target this damage effectively.
Area of Science:
- Pediatric pulmonology
- Respiratory medicine
- Cellular and molecular biology
Context:
- Asthma is the most common chronic pediatric disease.
- Small airway damage in children mirrors adult findings.
- Inflammatory and structural airway changes occur early in childhood asthma.
Purpose:
- To highlight the early onset and persistence of small airway damage in childhood asthma.
- To underscore the limitations of conventional treatments for small airway pathology.
- To emphasize the need for novel therapeutic strategies targeting the distal airways in pediatric asthma.
Summary:
- Childhood asthma involves proximal and distal airway inflammation and remodeling.
- Small airway damage, characterized by functional and structural changes, is evident in infants and young children.
- Prognostic factors include respiratory infections and in utero tobacco exposure.
Impact:
- Early small airway damage in asthma can have lifelong consequences.
- Current inhaled therapies are ineffective against small airway disease.
- This research highlights the urgent need for targeted therapies for pediatric asthma affecting small airways.
Introduction:
Asthma, the most common chronic disease in paediatrics, is characterised by an inflammatory process involving the proximal and distal airways, with remodelling of the airways and changes in respiratory function.
State Of The Art:
Recent studies in children have provided evidence of damage to the small airways identical to that occurring in adults. In fact inflammatory cells as well as structural alterations of the airways have been found in both bronchial biopsies and broncho-alveolar lavage fluid in infants and young children. At the functional level this damage is manifest by a reduction in maximum expiratory flow rates between 25-75% of the vital capacity. It also shows itself by the demonstration of thick walled bronchi and hypodense bands on the high resolution CT scan. It appears that conventional inhaled treatments have no effect on the small airways. Finally the main prognostic factors for this distal damage are respiratory infections and exposure to tobacco in utero.
Perspectives:
Damage to the small airways in childhood asthma indicates the need for new therapies aimed at this part of the respiratory system.
Conclusion:
Inflammation and remodelling of the small airways develops early in an asthmatic child whose respiratory system is growing rapidly and persists throughout life.
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