title: IPPB in severe pulmonary emphysema: limited applications.
mesh_terms: D000336:Aerosols; D006371:Helium / Q000627:therapeutic use; D006801:Humans; D007384:Intermittent Positive-Pressure Breathing; D010100:Oxygen / Q000627:therapeutic use; D011656:Pulmonary Emphysema / Q000628:therapy*