One-year analysis of longitudinal changes in spirometry in patients with COPD receiving tiotropium.
BACKGROUND
Airway medications have not been shown to reduce the loss of lung function in patients with COPD. We explored whether tiotropium 18 microg once daily could slow the rate of decline of lung function over a 1-year period.


METHODS
We performed a post-hoc analysis of data from 921 ambulatory COPD patients participating in two, 1-year, double-blind, tiotropium vs. placebo-controlled trials. Serial spirometry was obtained at baseline (before first dose of study drug), on day 8, at 6 weeks, and at 3, 6, 9 and 12 months after start of the study.


RESULTS
Baseline demographics and lung function were comparable. Baseline FEV1 was 1.01+/-0.41 (SD) L (39+/-14% predicted). Mean decline in trough FEV1 (i.e. FEV1 23-24 h after prior use of medication) between days 8 and 344 was 58 ml/year in the placebo group and 12 ml/year in the tiotropium group (p=0.005 vs. placebo); and between days 50 and 344 was 59 ml/year in the placebo group and 19 ml/year in the tiotropium group (p=0.036 vs. placebo).


CONCLUSIONS
Based on a retrospective analysis of 1-year, placebo-controlled clinical trials, tiotropium was associated with a reduced rate of loss of FEV1. Longer-term trials specifically designed to study this effect are required to confirm this observation.
Anzueto
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Department of Pulmonary/Critical Care, The University of Texas Health Science Center at San Antonio and the South Texas Veterans Health Care System, Audie L. Murphy Division, 7400 Merton Minter Blvd (111E), San Antonio, TX 78229, USA. anzueto@uthcsa.edu
Tashkin
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Menjoge
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Kesten
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D000280:Administration, Inhalation; D000305:Adrenal Cortex Hormones / Q000627:therapeutic use; D000368:Aged; D001993:Bronchodilator Agents / Q000627:therapeutic use*; D005260:Female; D005541:Forced Expiratory Volume / Q000502:physiology; D006801:Humans; D008297:Male; D029424:Pulmonary Disease, Chronic Obstructive / Q000188:drug therapy* / Q000503:physiopathology; D016032:Randomized Controlled Trials as Topic; D012189:Retrospective Studies; D012602:Scopolamine Derivatives / Q000627:therapeutic use*; D012907:Smoking / Q000503:physiopathology; D013147:Spirometry; D000069447:Tiotropium Bromide
D000305:Adrenal Cortex Hormones; D001993:Bronchodilator Agents; D012602:Scopolamine Derivatives; D000069447:Tiotropium Bromide