THE MERITS OF OXYGEN, AIR, AND HELIUM AS SINGLE-BREATH INDICATORS OF NONUNIFORM DISTRIBUTION OF INSPIRED  GAS.
D000388:Air; D035843:Biomedical Research; D006371:Helium; D006801:Humans; D009584:Nitrogen; D010100:Oxygen; D011656:Pulmonary Emphysema; D012129:Respiratory Function Tests
D006371:Helium; D009584:Nitrogen; D010100:Oxygen
AIR; CLINICAL RESEARCH; HELIUM; NITROGEN; OXYGEN; PULMONARY EMPHYSEMA; RESPIRATORY FUNCTION TESTS