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PEDIATRICS Vol. 113 No. 2 February 2004, pp. 345-350

Does Environment Mediate Earlier Onset of the Persistent Childhood Asthma Phenotype?

Ramesh J. Kurukulaaratchy, MRCP, Sharon Matthews, RGN and S. Hasan Arshad, DM, FRCP

From The David Hide Asthma and Allergy Research Centre, St Mary’s Hospital, Newport, Isle of Wight, United Kingdom

Objective. We investigated the role of environmental and hereditary factors in determining whether persistent childhood wheezing phenotypes had an early or late onset.

Methods. In a whole population birth cohort (n = 1456), children were seen at birth and at 1, 2, 4, and 10 years. At each visit, information was collected prospectively regarding wheeze prevalence and used to classify subjects into wheezing phenotypes. Information on genetic and environmental risk factors in early life was also obtained prospectively, and skin-prick testing to common allergens was performed at 4 years.

Results. Early-onset persistent wheezers (n = 125) had wheeze onset in the first 4 years, still present at age 10, whereas late-onset persistent wheezers (n = 81) had wheeze onset after age 4 years that was still present at 10 years. Multivariate logistic regression analysis identified independent significance only for inherited factors (parental asthma, family history of rhinitis, eczema at 4 years, and atopic status at 4 years) in the development of late-onset persistent wheeze. However, low social class at birth, recurrent chest infections at 2 years, and parental smoking at 2 years plus inherited factors (eczema at 2 years; food allergy at 4 years; maternal asthma, sibling asthma, maternal urticaria, and atopic status at 4 years) demonstrated independent significance for early-onset persistent wheeze.

Conclusion. Inheritance seems to be of prime significance in the cause of persistent childhood wheeze. Environmental exposure in early life may combine with this tendency to produce an early onset of persistent wheeze. Absence of these environmental factors might delay but not prevent the onset of wheeze in children with atopic heredity.

Key Words: childhood asthma • environment • heredity • persistent wheeze • risk factors

Abbreviations: IgE, immunoglobulin E


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