Poor inhalation technique, even after inhalation instructions, in childrenwith asthma

The aim of this study was to evaluate the effect of instructions to childre n with asthma (given by general practitioners or by pharmacy assistants) on how to inhale from metered dose inhalers with spacers (MDI/s) or dry powde r inhalers (DPI). We scored inhalation technique of asthmatic children acco rding to criteria defined by the Netherlands Asthma Foundation, and related the performance to the inhalation instructions given. For each inhaler, a number of steps were considered essential for reliable drug delivery. Patie nts newly referred for asthma were asked to demonstrate their inhalation te chnique and to fill out a questionnaire on the inhalation instruction recei ved prior to referral. Children participating in a clinical trial, who had received repeated comprehensive inhalation instructions, served as a contro l group. Sixty-six newly referred patients (1-14 years of age, median age 5 years; 3 7 boys) and 29 control patients (5-10 years of age, median age 7 years; 21 boys) completed the study. Sixty patients (91%) had received inhalation ins truction prior to referral. Only 29% of these patients, using a dry powder inhaler, performed all essential steps correctly, compared to 67% of childr en using a metered dose inhaler/spacer combination (P < 0.01). Children who had received comprehensive inhalation instructions with repeated checks of proper inhalation technique at the pharmacy or in the clinical trial setti ng were more likely to perform all essential steps correctly (79% and 93%, respectively) than children who had received a single instruction by a gene ral practitioner (39%, P < 0.01). Many asthmatic children use their inhalers devices too poorly to result in reliable drug delivery, even after inhalation instruction. Comprehensive in halation instruction and repeated check-ups are needed to assure reliable i nhalation technique. (C) 2000 Wiley-Liss, Inc.