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[Relationship between respiratory syncytial virus bronchiolitis and asthma]
G Dutau1, P Micheau, J L Rittié
1Hôpital des Enfants (allergologie et pneumologie), Toulouse, France.
Summary
Infantile asthma often follows severe respiratory syncytial virus (RSV) bronchiolitis, with over 50% of infants experiencing wheezing episodes. Severe cases can lead to long-term functional deficits, impacting childhood asthma persistence.
Area of Science:
- Pediatrics
- Pulmonology
- Immunology
Context:
- Infantile asthma is a heterogeneous condition with varying prognoses.
- Respiratory Syncytial Virus (RSV) bronchiolitis is a common trigger for infantile asthma.
- Severe RSV bronchiolitis, particularly requiring hospitalization, significantly increases the risk of subsequent asthma development.
Purpose:
- To review the literature on the relationship between RSV bronchiolitis and infantile asthma.
- To identify risk factors and predictors for the development and persistence of asthma in infants.
- To understand the long-term functional consequences of severe bronchiolitis.
Summary:
- Severe RSV bronchiolitis is strongly associated with the development of infantile asthma, with over 50% of affected infants experiencing recurrent wheezing for 2-3 years post-infection.
- Functional pulmonary abnormalities, such as bronchial hyperreactivity and hypoxia, can persist for months to years after severe bronchiolitis.
- Early-onset wheezing (before age 3) and positive allergy tests (IgE sensitization) are linked to persistent childhood asthma, while mild bronchiolitis typically does not lead to sequelae.
Impact:
- Highlights the critical role of severe RSV bronchiolitis as a precursor to infantile asthma.
- Emphasizes the importance of identifying infants at risk for persistent asthma.
- Suggests that pre-existing functional abnormalities may predispose infants to both bronchiolitis and asthma.