Comparison of the Provocative Concentration of Methacholine Causing a 20% Fall in FEV1 between the AeroEclipse II Breath-Actuated Nebulizer and the Wright Nebulizer in Adult Subjects with Asthma

RATIONALE: The American Thoracic Society guidelines for methacholine testing for the diagnosis of asthma recommends the 2-minute tidal breathing protocol with the Wright nebulizer, which produces more aerosol than required, generates a small particle size, and requires cleaning between tests. OBJECTIVES: To evaluate methacholine testing using a disposable, breath-actuated AeroEclipse II, which produces aerosol during inspiration and was …