Related Experiment Videos
Childhood asthma: clinical and immunological changes over a decade
D J Hill1, C S Hosking, M J Shelton
1Department of Allergy, Royal Children's Hospital, Melbourne, Australia.
Summary
Asthmatic children showed improved symptoms and reduced allergic responses to rye grass and house dust mites over nine years. However, no specific immune marker predicted this clinical improvement in asthma management.
Area of Science:
- Pediatric Allergy and Immunology
- Respiratory Medicine
- Immunology
Background:
- Asthma is a chronic respiratory condition often triggered by allergens like rye grass pollen and house dust mites.
- Bronchial hyper-reactivity is a key feature of asthma, indicating an exaggerated airway response to stimuli.
- Longitudinal studies are crucial for understanding the long-term progression and treatment efficacy in pediatric asthma.
Purpose of the Study:
- To investigate the 9-year clinical and immunological course of asthma in children with proven bronchial hyper-reactivity.
- To assess changes in asthma severity, allergic sensitization, and immune responses over time.
- To explore potential correlations between immunological markers and clinical outcomes in pediatric asthma.
Main Methods:
- A cohort of 26 Australian children with asthma and bronchial hyper-reactivity was studied over 9 years.
- Clinical data (symptoms, drug scores) and blood samples were collected longitudinally.
- Immune responses, including total IgE, specific IgE (anti-rye), and IgG (anti-rye and anti-mite) antibodies, were measured.
Main Results:
- Asthma symptom and drug scores decreased over the 9-year study period, particularly after rye grass pollen seasons.
- Significant reductions in total IgE, IgE anti-rye, and IgG anti-rye antibodies were observed in patients treated with hyposensitization.
- Patients with bronchial hyper-reactivity to house dust mite also showed decreased asthma severity and specific antibody levels.
- No specific immunological marker significantly correlated with the observed clinical improvements in asthma.
Conclusions:
- Pediatric asthma associated with bronchial hyper-reactivity to rye grass pollen and house dust mite can show progressive improvement over a decade.
- Hyposensitization may contribute to reduced allergic responses and improved asthma control.
- Despite clinical and immunological improvements, a direct correlation between specific immune markers and asthma outcomes remains elusive.