Inclusion Criteria:  Aged > 30. Affiliated to a Social Security scheme or beneficiary of such a scheme. Absence of cognitive disease questioning the validity of patient reported outcomes Ability to give free, informed consent. Adult patients with severe COPD, dyspnea ; with distension. Hospitalized at the CHB. Predicted FEV1 and FEV/FVC percentages consistent with severe COPD according to GOLD standards. mMRC >= 2. Exposure to tobbacco >= 10 packs/yrs.  Exclusion Criteria:  Pregnancy Known severe cardiac insufficiency. Known severe pulmonary arterial hypertension. Evolutive-cancer diagnosis. Significant cognitive impairment, hypercapnic encephalopathy or confusional syndrome. Deafness. Anemia ≤ 8g/dL. Psychotic pathology.