Abstract:
BACKGROUND:Exposure and sensitization to pet allergens are associated with allergic asthma in children. Conflicting data have emerged regarding the potential benefit of air cleaners with respect to a reduction of indoor pet allergens and bronchial hyperresponsiveness (BHR). METHODS:In a randomized controlled trial 36 asthmatic children with sensitization to cat and/or dog and significant exposure to cat and/or dog allergen (Fel d 1 and/or Can f 1 >500 ng/g of carpet dust) were included in order to study the effect of high-efficiency particulate arresting (HEPA) air cleaners placed in the living room and bedroom compared with the effect of sham air cleaners. Patients were allocated to two groups: group 1 exposed to active filters and group 2 exposed to sham filters. At month 0, after 6 months and after 12 months, pulmonary function testing and cold air challenge were performed, serum eosinophil cationic protein (ECP) and specific IgE to seven aeroallergens were determined, and carpet dust samples and filters were collected. Major pet allergen concentrations (Fel d 1, Can f 1) were determined in filters and bulk dust samples. RESULTS:Thirty patients completed the study. After 6 and 12 months, there was no significant change in delta FEV(1) after cold air challenge, or in the use of medication and serum ECP levels. However, there was a trend in the active group towards an improvement of bronchial hyperresponsiveness, whereas the sham filter group showed a deterioration of BHR. CONCLUSION:Although HEPA air cleaners retained airborne pet allergens, no effect on disease activity or allergen concentrations in bulk dust samples was observed in this study.
journal_name
Int Arch Allergy Immunoljournal_title
International archives of allergy and immunologyauthors
Sulser C,Schulz G,Wagner P,Sommerfeld C,Keil T,Reich A,Wahn U,Lau Sdoi
10.1159/000151502subject
Has Abstractpub_date
2009-01-01 00:00:00pages
23-30issue
1eissn
1018-2438issn
1423-0097pii
000151502journal_volume
148pub_type
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