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Symptoms, atopy, and bronchial reactivity after lower respiratory infection in infancy
Insights
Children with recurrent respiratory symptoms after infancy infections often have diminished lung function and increased bronchial reactivity. Atopic status and bronchial reactivity independently contribute to persistent symptoms, suggesting reactivity is key for classifying childhood respiratory conditions.
Area of Science:
- Pediatric Pulmonology
- Immunology
- Epidemiology
Background:
- Recurrent respiratory infections in infancy can lead to long-term respiratory issues.
- The roles of atopic status and bronchial hyperresponsiveness in persistent symptoms require further clarification.
Purpose of the Study:
- To investigate the prevalence of subsequent respiratory symptoms.
- To examine the relationship between atopic status and bronchial reactivity.
- To assess long-term respiratory outcomes 7 years after acute lower respiratory tract infections in infancy.
Main Methods:
- Study included 200 index children and controls followed for 7 years post-infancy respiratory infections.
- Evaluated ventilatory function and bronchial reactivity.
- Assessed subsequent respiratory symptoms and atopic background.
Main Results:
- Index children with recurrent symptoms showed diminished ventilatory function and increased bronchial reactivity.
- 'Atopic' and 'non-atopic' index children exhibited adverse trends in symptoms and lung function.
- Bronchial reactivity, not atopic status, appeared more relevant for differentiating 'asthmatic' from 'bronchitic' subgroups.
Conclusions:
- Atopic background and bronchial reactivity may independently contribute to persistent respiratory symptoms post-infancy infection.
- Bronchial reactivity is a potentially more valuable differentiator than atopic status for classifying childhood cough and wheeze.
- Findings suggest distinct pathways influencing long-term respiratory health after early-life infections.
Abstract:
We studied the prevalence of subsequent respiratory symptoms and the relation between atopic status and bronchial reactivity in 200 index children and their controls 7 years after acute lower respiratory tract infections in infancy. Index children with recurrent symptoms differed from controls in respect of social and family characteristics and atopic background. Ventilatory function was diminished and bronchial reactivity increased. Symptom free index children also came from poorer environmental backgrounds, but did not otherwise differ from controls. 'Atopic' index children differed significantly from controls in respect of subsequent symptoms and ventilatory function and similar adverse trends were observed in 'non-atopic' index children. A comparable proportion of 'atopic' and 'non-atopic' index children showed bronchial reactivity (33.5% and 38.9% respectively). Index subgroups with and without bronchial reactivity had increased cough and wheeziness compared with respective matched controls. The former included children with 'established' asthma and the latter those with 'established' bronchitis. Atopic backgrounds were similar in both subgroups, with no differences between cases and controls. These findings suggest that atopic background and bronchial reactivity are not closely related but may contribute independently to the persistence of symptoms after respiratory infections in infancy. Bronchial reactivity may be a more useful basis than atopic status on which to separate children with episodic cough or wheeze, or both, into 'asthmatic' and 'bronchitic' subgroups.