Efficacy of tiotropium and olodaterol combination therapy on dynamic lung hyperinflation evaluated by hyperventilation in COPD: an open-label, comparative before and after treatment study
Received 10 January 2019
Accepted for publication 10 April 2019
Published 27 May 2019 Volume 2019:14 Pages 1167—1176
Checked for plagiarism Yes
Review by Single-blind
Peer reviewer comments 6
Editor who approved publication: Dr Richard Russell
Shohei Kawachi,1 Keisaku Fujimoto2
1Department of Biomedical Laboratory Science, Graduate School of Medicine, Shinshu University, Nagano 390-8621, Japan; 2Department of Clinical Laboratory Sciences, Shinshu University School of Health Sciences, Matsumoto 390-8621, Japan
Background: Dynamic lung hyperinflation (DLH) following metronome-paced incremental hyperventilation (MPIH) was reported to be useful for assessment of pathophysiological impairment in patients with chronic obstructive pulmonary disease (COPD), and the effects of tiotropium and olodaterol on DLH following MPIH have not been reported.
Methods: Treatment consisted of administration of tiotropium/olodaterol 5/5 μg inhalation solution (2.5/2.5 μg per actuation) using a soft-mist inhaler once a day. We compared outcomes before and after 8 weeks of treatment. The primary outcome was defined as a decrease in inspiratory capacity (IC) from rest by MPIH, which is an index of DLH. The secondary outcomes were COPD assessment test (CAT), forced expiratory volume in 1 s (FEV1), and 6-min walking distance (6MWD). In addition, we investigated whether there were correlations between changes with treatment in DLH and FEV1, 6MWD, and dyspnea.
Results: Thirty-three of the 38 registered patients completed this study. Most of these 33 patients had mild to moderate COPD. Decreasing IC by MPIH was significantly reduced by treatment for 8 weeks, with a mean change of about −0.11 to −0.13 mL (P <0.05). In addition, CAT score, FEV1, and 6MWD improved with treatment (P <0.05). There were no significant correlations between changes in DLH, FEV1, 6MWD, or dyspnea with treatment.
Conclusions: The results of this study showed that the combination of tiotropium and olodaterol is effective for improvement of DLH following hyperventilation.
Keywords: bronchodilator agents, tiotropium, olodaterol, dynamic lung hyperinflation, hyperventilation
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