The chronic obstructive pulmonary disease can induct a respiratory failure, oxygentherapy is the best traitement. Long term oxygenotherapy traitement prevent pulmonary hypertension, hypercythemia and increases the survival rate of chronic hypoxemic patients. This patients need a learning phase to incorporate the basic information necessary to understand and self manage this particular treatment. The goal of this film is to remind this information and to giving to patient some practical advises concerning this disease and its management.