Different performance of two commercial nebulizers.

Two different nebulizers, the DeVilbiss 646 and the Mefar were tested for differences in output characteristics (air flow rate, amount of nebulized liquid and particle size) and it was found that there is a high variability between nebulizers of both brands. In the light of these findings, neither of these devices can be chosen as a standard nebulizer for bronchial provocation.