Efficacy of Oxygen Therapy Delivered by Systems Using Oxygen-Saving Valves in COPD Patients

The purpose of this study is to compare the efficacy of oxygen therapy delivered by systems using oxygen-saving valves or not (continuous oxygen). We aim to determine if systems using oxygen-saving valves are equally effective as continuous oxygen delivery systems in reducing exercise-induced hypoxemia in patients with COPD.

Inclusion Criteria:

• COPD on necessity of long term oxygen therapy
• Able to give their written consent

Exclusion Criteria:

• Unstable patients with COPD
• Patients with restrictive respiratory disease
• Patients with cardiac or neurologic disease contre-indicating the different evaluations