The role of seasonal grass pollen on childhood asthma emergency department presentations

Journal article


Erbas, B., Akram, M., Dharmage, S. C., Tham, R., Dennekamp, M., Newbigin, E., Taylor, P., Tang, M. L. K. and Abramson, M. J.. (2012) The role of seasonal grass pollen on childhood asthma emergency department presentations. Clinical and Experimental Allergy. 42(5), pp. 799 - 805. https://doi.org/10.1111/j.1365-2222.2012.03995.x
AuthorsErbas, B., Akram, M., Dharmage, S. C., Tham, R., Dennekamp, M., Newbigin, E., Taylor, P., Tang, M. L. K. and Abramson, M. J.
Abstract

Background: Few studies have focused on the role of grass pollen on asthma emergency department (ED) presentations among children. None have examined whether a dose-response effect exists between grass pollen levels and these asthma exacerbations. Objectives: To examine the association between increasing ambient levels of grass pollen and asthma ED presentations in children. To determine whether these associations are seen only after a thunderstorm, or whether grass pollen levels have a consistent influence on childhood asthma ED visits during the season. Methods: A short time series ecological study was conducted for asthma presentations to ED among children in Melbourne, Victoria, and grass pollen, meteorological and air quality measurements recorded during the selected 2003 period. A semi-parametric Poisson regression model was used to examine dose-response associations between daily grass pollen levels and mean daily ED attendance for asthma. Results: A smoothed plot suggested a dose-response association. As ambient grass pollen increased to about 19 grains/m3, the same day risk of childhood ED presentations also increased linearly (P < 0.001). Grass pollen levels were also associated with an increased risk in asthma ED presentations on the following day (lag 1, P < 0.001). Conclusion: This is the first study to establish a clear relationship between increased risk of childhood asthma ED attendance and levels of ambient grass pollen below 20 grains/m3, independent of any impact of thunderstorm-associated asthma. These findings have important implications for patient care, such as asthma management programs that notify the general public regarding periods of high grass pollen exposure, as well as defining the timing of initiation of pollen immunotherapy.

Keywordsasthma; environmental asthma; grass pollen
Year2012
JournalClinical and Experimental Allergy
Journal citation42 (5), pp. 799 - 805
PublisherWiley-Blackwell Publishing Ltd.
ISSN0954-7894
Digital Object Identifier (DOI)https://doi.org/10.1111/j.1365-2222.2012.03995.x
Scopus EID2-s2.0-84859951352
Page range799 - 805
Research GroupMary MacKillop Institute for Health Research
Place of publicationUnited Kingdom
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