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  • Title: The effect of tiotropium on the pulmonary diffusing capacity.
    Author: Gonlugur U.
    Journal: Methods Find Exp Clin Pharmacol; 2007 Oct; 29(8):535-7. PubMed ID: 18040529.
    Abstract:
    To our knowledge, there is no data on the effect of tiotropium on pulmonary gas exchange in healthy subjects. The aim of this study was to assess the effects of tiotropium on pulmonary diffusing capacity. Twenty-one healthy volunteers were enrolled for a prospective, randomized, double-blind, placebo-controlled study. Spirometric measurements, including pulmonary-diffusing capacity, were obtained before and after inhalation of drug or placebo. There was a significant decrease in forced vital capacity (FVC) and, consequently, an increase in the forced expiratory volume in one second (FEV1) to FVC ratio after placebo inhalation (p < 0.05), but no changes were found for percent-predicted FVC, FEV1, percent-predicted FEV1, percent-predicted forced expiratory flow (FEF25%-75%), percent-predicted peak expiratory flow (PEF), diffusing capacity of the lung for carbon monoxide (DLCO), single-breath alveolar volume (VA) and DLCO/VA ratio when compared with the baseline. Tiotropium inhalation caused a significant increase in FVC, percent-predicted FEV1, FEV1/FVC and percent-predicted FEF25%-75%, although the decrease in DLCO was insignificant (12.4 +/- 0.9 to 11.4 +/- 0.9). In conclusion, tiotropium does not change the pulmonary-diffusing capacity in healthy volunteers.
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