Abstract
The etiologic diagnosis of asthma requires bronchial provocation tests. Among the methods proposed for making obvious the bronchial reactions, those allowing to measure directly the intensity of the induced bronchospasm are found to be preferable. Among them, the airflow interruption technique seems to best meet the requirements imposed by the daily use of bronchial provocation tests, namely the two-timed interruption of airflow allowing to show the ventilatory asvncbro-nism, which is a pathognomonic phenomenon of the onset of an asthma attack.

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