Bronchodilation and bronchoprotection in asthmatic preschool children from formoterol administered by mechanically actuated dry-powder inhaler and spacer.
We evaluated the bronchodilatory and the bronchoprotective effect of the long-acting beta(2)-agonist formoterol administered as dry powder from a mechanically actuated dry-powder inhaler (DPI) using spacer in 12 asthmatic children 2 to 5 yr of age. Lung function was measured as the specific airway resistance (sRaw) in a whole body plethysmograph. Hyperventilation of cold, dry air was used as bronchial challenge, and the responsiveness was estimated as change in sRaw. The bronchoprotective effect of formoterol Turbohaler 9 microg was compared with salbutamol 200 microg and placebo at 15 min, 4 and 8 h postdose in a randomized, double-blind, placebo-controlled, crossover study. All treatments were administered from DPI (Turbohaler) actuated mechanically into a spacer. Formoterol and salbutamol caused similar and significant bronchodilation at the first measurement 3 min postdose. Formoterol offered a sustained and stable bronchodilation for at least 8 h. Salbutamol provided significant bronchodilation for less than 4 h. Formoterol caused significant bronchoprotection of 80% for at least 8 h compared with placebo, and from 4 h onward compared with salbutamol. Bronchoprotection from salbutamol lasted less than 4 h. In conclusion, formoterol administered as dry powder in a single dose provided rapid and sustained bronchodilation and clinically significant bronchoprotection for at least 8 h in 2- to 5-yr-old asthmatic children. Furthermore, this study suggests that mechanical actuation of DPI using a spacer is effective for aerosol treatment of young asthmatic children.
Nielsen
K G
KG
Department of Pediatrics, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark.
Bisgaard
H
H
D000280:Administration, Inhalation; D001249:Asthma / Q000188:drug therapy* / Q000503:physiopathology*; D001980:Bronchi / Q000187:drug effects* / Q000503:physiopathology*; D001993:Bronchodilator Agents / Q000008:administration & dosage*; D002675:Child, Preschool; D018592:Cross-Over Studies; D004311:Double-Blind Method; D004983:Ethanolamines / Q000008:administration & dosage*; D005260:Female; D000068759:Formoterol Fumarate; D006801:Humans; D008297:Male; D009330:Nebulizers and Vaporizers; D011208:Powders
D001993:Bronchodilator Agents; D004983:Ethanolamines; D011208:Powders; D000068759:Formoterol Fumarate