the purpose of this study is to evaluate the distance walked by patients with severe Chronic Obstructive Pulmonary Disease (COPD) during a Six-Minute Walk test (6MWT) while breathing Helium/Oxygen 65%/35% compared to either breathing Nitrogen/Oxygen 65%/35% or receiving Non-Invasive Ventilation (NIV) with a FiO2 of 0.35 and to evaluate exercise related symptoms
The purpose of this study is to evaluate effects of inspired gas mixtures on the distance walked by patients with severe Chronic Obstructive Pulmonary Disease (COPD) during a Six-Minute Walk test.