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Determinants of airway responsiveness to histamine in children

¹ School of Paediatrics and Child Health, and ² West Australia Institute for Medical Research, University of Western Australia, Perth, Australia

CORRESPONDENCE: S. W. Turner, School of Medicine, Dept of Child Health, Royal Aberdeen Children's Hospital, Foresterhill, Aberdeen AB25 2ZG, UK. Fax: 44 1224551919. E-mail: s.w.turner@abdn.ac.uk

Keywords: Asthma, atopy, bronchial hyperreactivity, child, respiratory infection, tobacco smoke

Received: April 21, 2004
Accepted November 10, 2004

Increased airway responsiveness (AR) is associated with asthma, but not all individuals with increased AR have asthma. The aim of this study was to identify factors, other than physician-diagnosed asthma (PDA), which are associated with increased AR.

In a longitudinal study, data were collected on atopy and lower respiratory tract illness (LRTI) in infancy, and AR (expressed as dose–response slope (DRS)), atopy, tobacco-smoke exposure and PDA in childhood.

At age 6 yrs, DRS was assessed in 102 children, of whom 22 (22%) had PDA; the corresponding figures at 11 yrs of age were 176 and 29 (15%). At age 6 yrs, DRS was significantly associated with PDA, current atopy and parental smoking (n = 83). At age 11 yrs, DRS was significantly associated with PDA, current atopy and LRTI in the first six months (n = 75). There was a significant positive interaction between atopy at age 12 months and PDA age 11 yrs.

In conclusion, these data suggest that factors other than asthma or atopy may determine the level of airway responsiveness in children. In children with asthma, airway responsiveness may be influenced by the early onset of atopy. The current findings may explain the inconsistent relationship between airway responsiveness and asthma.

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