Abstract
Inhalation challenges with allergens are considered the gold standard for the diagnosis of occupational asthma. However, no standardized methods are available. One open question is the degree of dose augmentation in the stepwise challenge protocols. Recently, it was recommended to increase the allergen concentrations by no more than doubling between dosing steps for safety reasons. We analyzed retrospectively our dosimeter allergen challenges performed with quadrupling dose steps during the last 10 years. Allergens were inhaled by an APSpro dosimeter and a DeVilbiss 646 nebulizer. The test was terminated after a fall of FEV1 of at least 20%. Seventeen tests in 13 subjects were considered positive. The mean FEV1 decreases 10 and 20–30 min after the last allergen dose were 26.7 ± 6.4 and 26.2 ± 6.5%baseline, respectively. Terminal dose response slopes did not differ between doubling (Cockcroft and Davis, J Allergy Clin Immunol, 122:1034–1035, 2008) and quadrupling doses, nor were there any differences concerning the maximal responses. The results suggest that quadrupling dose steps may be an acceptable alternative, without serious increase in risk of severe asthmatic reactions. We assume that by shortening the test duration, physicians might choose lower starting doses and thus make allergen inhalation challenges safer.
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Acknowledgements
We thank Donald Cockcroft, Division of Respirology, Critical Care and Sleep Medicine, University of Saskatchewan, Royal University Hospital Saskatoon, Saskatchewan, Canada for providing his data and advice.
Conflicts of Interest: The authors declare no conflicts of interest in relation to this article.
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© 2013 Springer Science+Business Media Dordrecht
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Mousalli, S., van Kampen, V., Merget, R. (2013). Bronchial Allergen Challenges: Doubling or Quadrupling Dose Steps?. In: Pokorski, M. (eds) Respiratory Regulation - Clinical Advances. Advances in Experimental Medicine and Biology, vol 755. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-4546-9_11
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DOI: https://doi.org/10.1007/978-94-007-4546-9_11
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