Overview Effect of Tiotropium on Airway Diameter in Patients With Chronic Obstructive Pulmonary Disease (COPD) Status: Completed Trial end date: 1969-12-31 Target enrollment: Participant gender: Summary Trial to investigate the acute and chronic effect of tiotropium therapy on airway diameter in COPD patients as measured by inspiratory capacity (IC). Phase: Phase 3 Details Lead Sponsor: Boehringer IngelheimTreatments: Tiotropium Bromide