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The methacholine (MCH) challenge test is performed to detect bronchial hyperresponsiveness in subjects suffering from asthma. It is conducted by inhaling spasmogen substances at increasing doses and measuring FEV1-PD20 variation following the bronchoconstriction evoked.This paper describes a new method for MCH challenge test using pre-metered respirable powders of MCH at different doses for facilitating...
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