Related Experiment Videos
Atopy and pulmonary function abnormalities in children with a history of acute bronchiolitis
J Arribas1, C Colás, A Sebastián
1Servicio de Neumología, Hospital Miguel Servet, Zaragoza Spain. med0009039@nacom.es
Insights
Children with a history of acute viral bronchiolitis may have underlying lung function changes and atopy, increasing their risk for asthma. These findings are present even without recurrent wheezing, highlighting early indicators of respiratory health.
Area of Science:
- Pediatric Respiratory Medicine
- Allergy and Immunology
- Pulmonary Function Testing
Background:
- Acute viral bronchiolitis is a common childhood illness.
- The long-term respiratory consequences of bronchiolitis remain a significant concern.
- Asthma development in childhood is multifactorial, with early infections being a potential trigger.
Purpose of the Study:
- To investigate the association between acute viral bronchiolitis and the later development of asthma.
- To identify potential pulmonary and immunological markers in children with a history of bronchiolitis.
Main Methods:
- Retrospective cohort study design.
- Inclusion of 97 children with a history of acute viral bronchiolitis (index group) and 52 controls.
- Assessment of pulmonary function (mean expiratory flow at 50% vital capacity - MEF50) and bronchial hyperresponsiveness (methacholine challenge).
- Evaluation of atopy incidence.
Main Results:
- The bronchiolitis group exhibited significantly lower MEF50 values compared to controls.
- A higher incidence of atopy was observed in children with a history of bronchiolitis.
- Increased bronchial hyperresponsiveness to methacholine was noted in the bronchiolitis group, irrespective of recurrent wheezing.
- These physiological and immunological differences were present even in the absence of overt asthma symptoms.
Conclusions:
- A history of acute viral bronchiolitis is associated with persistent abnormalities in lung function (reduced MEF50).
- Children with prior bronchiolitis show increased bronchial hyperresponsiveness and a higher prevalence of atopy.
- These findings suggest that subclinical respiratory impairments and immunological predispositions may exist post-bronchiolitis, potentially indicating an elevated risk for future asthma development.
Abstract:
To assess the relationship between acute viral bronchiolitis and subsequent development of asthma, we studied retrospectively 97 index children, aged between 9 and 14 years, and 52 controls. The bronchiolitis group showed significantly lower values for mean expiratory flow at 50% of vital capacity (MEF50) higher incidence of atopy, and were more sensitive to methacholine than were controls, even if they had not shown recurrent wheezing episodes. It is suggested that an increased incidence of atopy, bronchial hyperresponsiveness, and reduced expiratory flows may be detectable in children with a history of acute bronchiolitis, regardless of the fact that they did not develop subsequent clinical symptoms suggestive of bronchial asthma.