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- W2418173708 abstract "Lung function tests must distinguish a true drug-induced bronchial response from changes not related to the drug itself, mainly due to intra-individual variability. We compared the variability and ability to detect true drug-induced bronchodilation of 3 modes of expression of the increase in forced expiratory volume in 1 second (delta FEV1) following administration of a 0.25 mg single oral dose of RU 42 173, a new beta 2-agonist. The study was performed in 12 patients with reversible obstructive asthma in a double-blind, crossover, placebo-controlled, randomized manner. The variability of each index was assessed by calculating the coefficient of variation (SD/mean). True drug-induced bronchodilation was assessed by calculating the F value of each index corresponding to the ratio of between-treatment to within-group differences. Three modes of expression of delta FEV1 were compared: delta FEV1 (L) = the absolute increase in FEV1, delta FEV1 (% baseline) and delta FEV1 (% predicted) where delta FEV1 (L) is divided by baseline FEV1 or predicted FEV1, respectively. A statistically significant increase in FEV1 was found up to respectively 3, 2 and 4 hours after dosing when using delta FEV1 (L), delta FEV1 (% baseline) and delta FEV1 (% predicted). The highest F value was obtained for delta FEV1 (% predicted). The coefficient of variation was lower with delta FEV1 (% predicted) than delta FEV1 (L) and delta FEV1 (% baseline). In conclusion, RU 42 173 showed a bronchodilating effect which appears to be clinically relevant. delta FEV1 (% predicted) was to be the least variable and most powerful index and should be preferred to delta FEV1 (L) and even more to delta FEV1 (% baseline) to assess the acute airway response to a bronchodilator drug." @default.
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- W2418173708 date "1992-01-01" @default.
- W2418173708 modified "2023-09-26" @default.
- W2418173708 title "Best mode of expression of acute reversibility of airway obstruction in patients with asthma: application to a new beta-2 agonist, RU 42 173." @default.
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