Contribution to the standardization of pharmacodynamic tests in lung function

By bringing the aerosols in a spirometrical bell from which a constant volume aerosol was thereafter inhaled by each subject through a bi-directional valve, we observed more consistent and reproducible ventilatory results than by giving the aerosols by means of a classical device via a face mask. Moreover the results were significantly higher with the first technique; this fact suggests that the quantity of inhaled broncho-active drug with suitable granulometry would have been on the average greater per minute with the first method.