Clinical comparability of albuterol delivered by the breath-actuated inhaler (Spiros) and albuterol by MDI in patients with asthma.
OBJECTIVE
This study compares the efficacy and safety of one and two actuations of albuterol sulfate powder delivered via a breath-actuated, effort-assisted, investigational inhaler (Spiros, Dura Pharmaceuticals, Inc) and albuterol delivered via a conventional propellant-driven metered dose inhaler (Ventolin, Glaxo, Inc).


METHODS
Randomized, double-blind, placebo-controlled, 5-way crossover study.


METHODS
Sixty patients with mild-to-moderate asthma (FEV1 59% predicted) were enrolled and 44 completed the study.


RESULTS
FEV1 values over 6 hours were analyzed by ANCOVA and the Finney relative potency model. The relative potency of the inhalers (albuterol MDI: albuterol DPI) was 1.132 (90% CI, 0.680 to 2.252) indicating 1.132 actuations of albuterol MDI provided the same bronchodilation as one actuation of albuterol DPI. ANCOVA analyses further indicated that there were no significant differences between the two delivery systems with respect to FEV1, FVC, FEF25-75%, or PEF. Both inhalers had similar effects on serum potassium levels, QTc interval, blood pressure, and heart rate.


CONCLUSIONS
In patients with mild-to-moderate asthma in this study, the albuterol DPI was determined to be therapeutically comparable to albuterol MDI in the delivery of one and two actuations of albuterol.
Geoffroy
P
P
Phoenix International Life Sciences, Montreal, Quebec, Canada.
Lalonde
R L
RL
Ahrens
R
R
Clarke
W
W
Hill
M R
MR
Vaughan
L M
LM
Grossman
J
J
D000280:Administration, Inhalation; D000293:Adolescent; D000328:Adult; D000368:Aged; D000420:Albuterol / Q000008:administration & dosage* / Q000009:adverse effects / Q000627:therapeutic use*; D001249:Asthma / Q000188:drug therapy*; D018592:Cross-Over Studies; D005260:Female; D005541:Forced Expiratory Volume / Q000187:drug effects; D006801:Humans; D008297:Male; D008875:Middle Aged; D009330:Nebulizers and Vaporizers; D013997:Time Factors
D000420:Albuterol