[Usefulness of peak expiratory flow measurement for selection of dry powder inhalers in asthmatic children].

Peak inspiratory flow rate (PIFR) in 64 asthmatic children aged 6-12 yrs was investigated. In-Check set (peak inspiratory flow meter) which can mimic the internal resistance of some dry powder inhalers, e.g. Discus, Aerolizer and Turbuhaler, was used. All children achieved the minimum and optimum PIFR independently to bronchial obstruction when using Discus resistance. Minimum and optimum values of PIFR adequate for Turbuhaler resistance attained 100% and 77% of analysed patients. The worst results were observed in regard to Aerolizer resistance when 97% of children achieved minimum and only 30% optimum PIFR for this inhaler. Checking actually PIFR may be useful before prescribing dry pressure inhaler for children, especially in cases with bronchial obstruction.