[Study of the regional distribution of inspired gas with radioactive tracers (author's transl)]

Two different techniques are utilized: aerosol with 198Au particles (size 0.5-15 micron) and different gaz mixtures (air; O2 20% + He 80+; O2 60% + N2 40%; O2 60% + He 40%) with 133Xe and registration of the regional distribution along a wash-in (upper, middle and basal) of every lung (gamma camer, computer, Polaroid photographs, scans), performed in three groups of subjects (normal: 5, bronchogenic carcinoma: 11 and chronic bronchitis: 5). Modifications of the airway distribution and blood gas data according to the technical approach (particularly, variations of densities and viscosities) are compared with results in normal subjects.