Objective: To evaluate the protective effect of different doses of inhaled fenoterol (F) on bronchoconstriction induced by methacholine (M). Design: randomized double-blind study. Setting: Referrence center. Participants: 9 children (aged from 7 to 15 years old), with mild or moderate asthma and allergic to D. pteronyssinus. Intervention: On the first day, the M concentration necessary to induce a 20% fall in the forced expiratory volume in the first second (FEV 1 ; PC 20 FEV 1 ) was determined using closed c…
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