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Bronchiolitis, respiratory syncytial virus, and recurrent wheezing: what is the relationship?
Claudia de Brito Fonseca1, Sandra Grisi
1Children's Institute, Hospital das Clínicas, Faculty of Medicine, University of São Paulo, Brazil.
Insights
Respiratory syncytial virus (RSV) bronchiolitis in infants may lead to recurrent childhood wheezing. This review explores hypotheses linking RSV infection to persistent airway issues.
Area of Science:
- Pediatric Pulmonology
- Infectious Diseases
- Allergy and Immunology
Background:
- Bronchiolitis caused by respiratory syncytial virus (RSV) affects many infants.
- Up to 50% of infants hospitalized with RSV bronchiolitis develop recurrent wheezing in childhood.
- The causal link between RSV bronchiolitis and recurrent wheezing remains unclear.
Purpose of the Study:
- To review and analyze existing hypotheses on the relationship between RSV bronchiolitis and recurrent childhood wheezing.
- To clarify the underlying mechanisms contributing to post-bronchiolitis wheezing.
- To provide insights into the management and prevention of recurrent wheezing.
Main Methods:
- Literature review of studies investigating RSV bronchiolitis and recurrent wheezing.
- Analysis of proposed etiological hypotheses.
- Synthesis of current evidence on the topic.
Main Results:
- Two primary hypotheses are discussed: individual predisposition and direct viral impact.
- Predisposition involves atopy, airway hyperreactivity, or pre-existing pulmonary conditions.
- Direct viral impact suggests airway inflammation and damage from RSV infection cause persistent issues.
Conclusions:
- RSV bronchiolitis is a significant risk factor for recurrent childhood wheezing.
- Understanding the mechanisms (predisposition vs. direct viral effect) is crucial for targeted interventions.
- Further research is needed to elucidate the precise pathways and develop effective prevention strategies.
Abstract:
Various follow-up studies of children hospitalized with bronchiolitis caused by respiratory syncytial virus have demonstrated that a significant proportion of infants (50%) have recurrent wheezing during childhood. Nevertheless, the relationship between these two entities, if any, has not been established. In order to explain this observation, several hypotheses have been proposed. The first suggests that some children could have an individual predisposition to bronchiolitis caused by respiratory syncytial virus and recurrent wheezing. The virus could be a marker of this condition, and the individual predisposition could in turn be related to an individual hypersensitivity to common allergens (atopy), airway hyperreactivity, or to some disorder related to pulmonary anatomy or physiology that was present before the acute episode of bronchiolitis. Another hypothesis proposes that respiratory syncytial virus could be directly responsible for recurrent wheezing. During an episode of bronchiolitis, the damage in the airway mucosa caused by the vital inflammatory response to infection contributes to sensitivity to other allergens or exposes irritant receptors, resulting in recurrent wheezing. For this review, we analyzed the studies that discuss these hypotheses with the purpose of clarifying the mechanisms for the important issue of recurrent wheezing in childhood.