title: House dust mite barrier bedding for childhood asthma: randomised placebo controlled trial in primary care [ISRCTN63308372].
abstract: BACKGROUND
  The house dust mite is the most important environmental allergen implicated in the aetiology of childhood asthma in the UK. Dust mite barrier bedding is relatively inexpensive, convenient to use, and of proven effectiveness in reducing mattress house dust mite load, but no studies have evaluated its clinical effectiveness in the control of childhood asthma when dispensed in primary care. We therefore aimed to evaluate the effectiveness of house dust mite barrier bedding in children with asthma treated in primary care.
  
  
  METHODS
  Pragmatic, randomised, double-blind, placebo controlled trial conducted in eight family practices in England. Forty-seven children aged 5 to 14 years with confirmed house dust mite sensitive asthma were randomised to receive six months treatment with either house dust mite barrier or placebo bedding. Peak expiratory flow was the main outcome measure of interest; secondary outcome measures included asthma symptom scores and asthma medication usage.
  
  
  RESULTS
  No difference was noted in mean monthly peak expiratory flow, asthma symptom score, medication usage or asthma consultations, between children who received active bedding and those who received placebo bedding.
  
  
  CONCLUSIONS
  Treating house dust mite sensitive asthmatic children in primary care with house dust mite barrier bedding for six months failed to improve peak expiratory flow. Results strongly suggest that the intervention made no impact upon other clinical features of asthma.
authors.affiliation: Department of Primary Health Care & General Practice, Imperial College of Science, Technology & Medicine, London, UK. aziz.sheikh@ic.ac.uk
authors.forename: Aziz
authors.initials: A
authors.lastname: Sheikh
authors.forename: Brian
authors.initials: B
authors.lastname: Hurwitz
authors.forename: Bonnie
authors.initials: B
authors.lastname: Sibbald
authors.forename: Greta
authors.initials: G
authors.lastname: Barnes
authors.forename: Maggie
authors.initials: M
authors.lastname: Howe
authors.forename: Stephen
authors.initials: S
authors.lastname: Durham
mesh_terms: D000293:Adolescent; D017677:Age Distribution; D001249:Asthma / Q000175:diagnosis / Q000453:epidemiology / Q000517:prevention & control*; D001512:Bedding and Linens; D002648:Child; D002675:Child, Preschool; D004311:Double-Blind Method; D004739:England / Q000453:epidemiology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D010366:Peak Expiratory Flow Rate; D011320:Primary Health Care / Q000379:methods* / Q000706:statistics & numerical data*; D039981:Pyroglyphidae; D017678:Sex Distribution; D016896:Treatment Outcome