title: Effect of breath-holding on expired gas concentrations of He and SF6 in healthy subjects and patients with obstructive lung disease.
mesh_terms: D001249:Asthma / Q000503:physiopathology; D005459:Fluorides / Q000032:analysis*; D006371:Helium / Q000032:analysis*; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000503:physiopathology*; D011650:Pulmonary Alveoli / Q000502:physiology; D011656:Pulmonary Emphysema / Q000503:physiopathology; D012016:Reference Values; D012119:Respiration; D013459:Sulfur Hexafluoride / Q000032:analysis*
chemical_list: D006371:Helium; D005459:Fluorides; D013459:Sulfur Hexafluoride