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Clinical, functional, and epidemiological differences between atopic and nonatopic asthmatic children from a tertiary

Jose A Castro-Rodriguez1, Ana M Ramirez, Paola Toche

  • 1School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile. jacastro17@hotmail.com

Annals of Allergy, Asthma & Immunology : Official Publication of the American College of Allergy, Asthma, & Immunology
|March 24, 2007
PubMed

Insights

In Chilean children, non-atopic asthma (non-AA) is common. Atopic asthma (AA) is linked to more severe exacerbations and higher nasal eosinophils, while non-AA shows earlier onset and more home tobacco exposure.

Area of Science:

  • Pediatric Allergy and Immunology
  • Respiratory Medicine
  • Epidemiology

Background:

  • Atopic asthma (AA) and nonatopic asthma (non-AA) present differently in children.
  • Data on clinical, functional, and epidemiological differences between AA and non-AA are scarce, especially in developing countries where non-AA may be more prevalent.

Purpose of the Study:

  • To investigate and compare clinical, functional, and epidemiological characteristics of children with atopic asthma versus nonatopic asthma in Chile.

Main Methods:

  • A cross-sectional study involving 237 asthmatic children (ages 4-14) classified by skin prick tests.
  • Data collected included demographics, spirometry, bronchial challenge tests, nasal eosinophil counts, and medical history (pneumonia, home tobacco exposure, asthma exacerbations).

Main Results:

  • Atopic asthma (AA) was diagnosed in 62.5% of children.
  • Non-AA children had earlier asthma onset and more frequent pneumonia and home tobacco exposure.
  • AA children exhibited higher nasal eosinophilia, dermatitis, and severe exacerbations (ED visits, oral steroid courses). Lung function was similar between groups.
  • Multivariate analysis identified oral steroid courses as the only significant difference associated with AA.

Conclusions:

  • Nonatopic asthma (non-AA) is prevalent (37.6%) in this cohort of Chilean schoolchildren.
  • Distinct clinical and epidemiological differences exist between atopic asthma (AA) and nonatopic asthma (non-AA) in children.
  • These findings highlight the importance of differentiating asthma phenotypes in pediatric populations.
Abstract

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