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Murine Model of Allergen Induced Asthma
Published on: May 14, 2012
Asthma phenotypes in inner-city children
Edward M Zoratti1, Rebecca Z Krouse2, Denise C Babineau2
1Henry Ford Health System and Wayne State University School of Medicine, Detroit, Mich.
Insights
Asthma phenotypes in urban children vary, with allergy playing a key role. Researchers identified distinct groups, including one with severe symptoms but low allergy, highlighting the need for tailored asthma management.
Area of Science:
- Pediatric Allergy and Immunology
- Respiratory Medicine
- Clinical Epidemiology
Background:
- Asthma significantly impacts children in low-income urban settings, yet specific phenotypic data for tailored management is scarce.
- Understanding asthma phenotypes is crucial for developing effective, individualized treatment strategies in vulnerable pediatric populations.
Purpose of the Study:
- To identify distinct asthma phenotypes among inner-city children receiving guideline-based management.
- To characterize these phenotypes based on clinical, physiological, and allergic markers.
Main Methods:
- Cluster analysis of 50 baseline and 12 longitudinal variables in 616 children (aged 6-17) from nine urban centers.
- Data collection included asthma/rhinitis severity, pulmonary function, allergy status (sensitization, IgE), and inflammation markers.
- Participants received optimal, guideline-based management for asthma and rhinitis throughout the 1-year study.
Main Results:
- Five distinct asthma clusters (A-E) were identified, differing in symptom severity, pulmonary function, and allergic profiles.
- Cluster A showed minimal symptoms with low allergy; Cluster E presented severe, symptomatic asthma with high allergy markers (IgE, eosinophils, sensitization).
- A notable phenotype (Cluster B) exhibited severe symptoms despite treatment, with lower allergy and inflammation levels.
Conclusions:
- Allergy is a significant factor differentiating asthma phenotypes in urban children.
- Severe asthma frequently co-occurs with high allergic profiles, but a distinct phenotype of symptomatic asthma with low allergy was also identified.
- These findings underscore the heterogeneity of childhood asthma and the importance of considering allergic status for personalized management approaches.
Background:
Children with asthma in low-income urban areas have high morbidity. Phenotypic analysis in these children is lacking, but may identify characteristics to inform successful tailored management approaches.
Objective:
We sought to identify distinct asthma phenotypes among inner-city children receiving guidelines-based management.
Methods:
Nine inner-city asthma consortium centers enrolled 717 children aged 6 to 17 years. Data were collected at baseline and prospectively every 2 months for 1 year. Participants' asthma and rhinitis were optimally managed by study physicians on the basis of guidelines. Cluster analysis using 50 baseline and 12 longitudinal variables was performed in 616 participants completing 4 or more follow-up visits.
Results:
Five clusters (designated A through E) were distinguished by indicators of asthma and rhinitis severity, pulmonary physiology, allergy (sensitization and total serum IgE), and allergic inflammation. In comparison to other clusters, cluster A was distinguished by lower allergy/inflammation, minimally symptomatic asthma and rhinitis, and normal pulmonary physiology. Cluster B had highly symptomatic asthma despite high step-level treatment, lower allergy and inflammation, and mildly altered pulmonary physiology. Cluster C had minimally symptomatic asthma and rhinitis, intermediate allergy and inflammation, and mildly impaired pulmonary physiology. Clusters D and E exhibited progressively higher asthma and rhinitis symptoms and allergy/inflammation. Cluster E had the most symptomatic asthma while receiving high step-level treatment and had the highest total serum IgE level (median, 733 kU/L), blood eosinophil count (median, 400 cells/mm3), and allergen sensitizations (15 of 22 tested).
Conclusions:
Allergy distinguishes asthma phenotypes in urban children. Severe asthma often coclusters with highly allergic children. However, a symptomatic phenotype with little allergy or allergic inflammation was identified.
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