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Tiotropium improves lung volumes compared with placebo. Reproduced from Celli B, ZuWallack R, Wang S, et al. 2003. Improvement in resting inspiratory capacity and hyperinflation with tiotropium in COPD patients with increased static lung volumes. Chest, 124:1743–8. Copyright © 2003, with permission from CHEST.
Abbreviations: FRC, functional residual capacity; IC, inspiratory capacity; SVC, slow vital capacity.
