title: [He washout from obstructed lung segments by collateral ventilation (author's transl)].
abstract: The time of He washout from totally obstructed segments in the intact dog lung is about twice that of non-obstructed segments. Within one breath the He is transferred from obstructed to non-obstructed to non-obstructed segments in relative great quantities, indicating that the transport of the gas occurs by collateral ventilation and not by diffusion. This is in good agreement with calculations about the He transfer through the alveolar wall by diffusion or by flow through the alveolar pores. It can be assumed that the transfer by collateral ventilation in obstructed segments is about 10(4) times greater than by diffusion through collateral channels.
mesh_terms: D000818:Animals; D004285:Dogs; D006371:Helium / Q000378:metabolism*; D008168:Lung / Q000378:metabolism*; D008173:Lung Diseases, Obstructive / Q000378:metabolism*; D008954:Models, Biological; D011650:Pulmonary Alveoli / Q000378:metabolism; D011653:Pulmonary Diffusing Capacity
chemical_list: D006371:Helium
vernacular_title: He-Auswaschung aus stenosierten Lungensegmenten durch kollaterale Ventilation