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A bronchial challenge test is a medical test used to assist in the diagnosis of asthma. [1] The patient breathes in nebulized methacholine or histamine. Thus the test may also be called a methacholine challenge test or histamine challenge test respectively. Both drugs provoke bronchoconstriction, or narrowing of the airways.
This test requires the patient to breathe aerosols of the suspected agent (asthmagen) through an oro-facial mask or mouth piece. These asthmagens are aerosolized using closed-circuit chambers, and the quantities and concentrations administered being minute and extremely stable minimize the risk of exaggerated responses. [5]
Bronchial hyperresponsiveness can be assessed with a bronchial challenge test. This most often uses products like methacholine or histamine. These chemicals trigger bronchospasm in normal individuals as well, but people with bronchial hyperresponsiveness have a lower threshold.
Methacholine is primarily used to diagnose bronchial hyperreactivity, [1] which is the hallmark of asthma and also occurs in chronic obstructive pulmonary disease. This is accomplished through the bronchial challenge test, or methacholine challenge, in which a subject inhales aerosolized methacholine, leading to bronchoconstriction.
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Methacholine +++ + ++ Used to diagnose bronchial hyperreactivity, [11] a hallmark of asthma and COPD. Bethanechol +++--Used in bladder and gastrointestinal hypotonia. Muscarine +++--Natural alkaloid found in certain mushrooms. Cause of one form of mushroom poisoning Nicotine-+++-Natural alkaloid found in the tobacco plant. Pilocarpine ++--Used ...
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The Nasal Provocation Test (NPT or nasal challenge test) is a medical procedure indicated for help the diagnosis of allergic rhinitis and nonallergic rhinitis. [1] NPT may be monitored by clinical scores, rhinomanometry , acoustic rhinometry , nasal smear cytology and/or spirometry .