Functional respiratory imaging assessment of glycopyrrolate and formoterol fumarate metered dose inhalers formulated using co-suspension delivery technology in patients with COPD.

Changes in airway volume were generally consistent across lobes for both treatments; however, the untransformed analysis of untrimmed iVaw by airway generation showed a nominally significant interaction between treatment and generation ( p = 0.0469), indicating potential differences in the effects of GP MDI and FF MDI by generation ( Figure 3(a) ).

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