title: A comparative analysis of the particle size output of beclomethasone diproprionate, salmeterol xinafoate and fluticasone propionate metered dose inhalers used with the Babyhaler, Volumatic and Aerochamber spacer devices.
abstract: OBJECTIVE
  To determine in vitro the effect of delay, inspiratory flow, and spacer washing on the drug output of metered dose inhalers (MDIs) used with different spacer devices.
  
  
  METHODS
  The amount of drug in particles <5 microm diameter from MDI+spacer, sampling after a delay of up to 20 s, was measured using a Multistage Liquid Impinger. Drug output was also measured at different flow rates, and after washing the Babyhaler in household detergent.
  
  
  RESULTS
  More fluticasone in small particles was recovered from the Babyhaler than the Volumatic or the Aerochamber spacers, and more beclomethasone and salmeterol was recovered from the Babyhaler and Volumatic spacers than from the Aerochamber. Washing the Babyhaler reduced the recovery of salmeterol, and did not alter the recovery of the other drugs tested.
  
  
  CONCLUSIONS
  Spacer devices need to be fully evaluated for each drug prescribed for them.
authors.affiliation: Department of Child Health, University of Leicester, Leicester, UK.
authors.forename: P W
authors.initials: PW
authors.lastname: Barry
authors.forename: C
authors.initials: C
authors.lastname: O'callaghan
mesh_terms: D000420:Albuterol / Q000008:administration & dosage / Q000031:analogs & derivatives*; D000730:Androstadienes / Q000008:administration & dosage*; D001507:Beclomethasone / Q000008:administration & dosage*; D000068298:Fluticasone; D009330:Nebulizers and Vaporizers; D010316:Particle Size; D000068299:Salmeterol Xinafoate
chemical_list: D000730:Androstadienes; D000068299:Salmeterol Xinafoate; D000068298:Fluticasone; D001507:Beclomethasone; D000420:Albuterol