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Inhalation Challenge

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Inhalation challenge with methacholine is now a standardized procedure using a drug specifically approved for the purpose of determining the nature and extent of airways hyperreactivity. The methodology described involves the intermittent administration of graduated concentrations of methacholine by aerosol inhalation followed by routine spirometry after each incremental dose thereby enabling the construction of a dose response curve. The PD20FEV1, the provocation dose of agonist necessary for a 20% decrease in FEV1, is interpolated from the curve and is the accepted index of airways sensitivity. Clinically, the procedure has been widely used to implement the diagnosis of asthma in such atypical cases as when the physical exam and pulmonary function tests are equivocal. In such a setting, a positive test often justifies the use of therapeutic bronchodilators whereas a negative test would lead the examiner away from the alternative of hyperactive airways. Other applications include the evaluation of antigen sensitivity for diagnostic and research purposes including occupational asthma, epidemiology, and investigational drug trials.

Document Type: Research Article


Publication date: March 1, 1988

More about this publication?
  • Allergy and Asthma Proceedings is a peer reviewed publication dedicated to distributing timely scientific research regarding advancements in the knowledge and practice of allergy, asthma and immunology. Its primary readership consists of allergists and pulmonologists.

    The goal of the Proceedings is to publish articles with a predominantly clinical focus which directly impact quality of care for patients with allergic disease and asthma.

    Featured topics include asthma, rhinitis, sinusitis, food allergies, allergic skin diseases, diagnostic techniques, allergens, and treatment modalities. Published material includes peer-reviewed original research, clinical trials and review articles.

    Articles marked "F" offer free full text for personal noncommercial use only.

    The journal is indexed in Thomson Reuters Web of Science and Science Citation Index Expanded, plus the National Library of Medicine's PubMed service.
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