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Abstract
Eleven patients entered a pilot study designed to evaluate the proportion of eligible responders following a single inhalation of albuterol aerosol, the degree of response, and the sensitivity to distinguish between one and two inhalations based on FEV1 response. Each patient received a single inhalation at 0 and 60 minutes. FEV1 was measured 30 and 60 minutes after each inhalation. Most patients (82%) responded to a single inhalation and the majority (73%) were capable of further response after two inhalations. This study design was able to distinguish FEV1 responses to one and two inhalations of albuterol and provide upward and downward sensitivity sufficient to detect major differences in products.