title: The pulmonary capillary blood flow (Qc) at rest and work measured simultaneously by 3 inert substances.
abstract: We have considered the opportunity of using some inert vapours (2-3 Dimethylbutane, 2 Methylpentane, n-Hexane) to measure the pulmonary capillary blood flow (Qc). The measurements were performed by means of a gas chromatograph connected with a mass spectrometer. The alpha values (Bunsen absorption coefficients) measured by a constant pressure method (multiple equilibration methods) were reported. Qc was measured in 14 healthy subjects at rest and in 5 subjects during exercise (25 and 50 watt by means of a cyclo ergometer, steady state test) (rebreathing method). The method used allow multiple measurements of Qc during the same exercise test.
authors.affiliation: Department of Preventive, Occupational and Community Medicine, University of Pavia.
authors.forename: M
authors.initials: M
authors.lastname: Imbriani
mesh_terms: D000328:Adult; D001944:Breath Tests; D002073:Butanes / Q000032:analysis; D002196:Capillaries / Q000502:physiology; D002302:Cardiac Output; D005260:Female; D008401:Gas Chromatography-Mass Spectrometry / Q000295:instrumentation / Q000379:methods; D006586:Hexanes / Q000032:analysis; D006801:Humans; D008297:Male; D010420:Pentanes / Q000032:analysis; D011652:Pulmonary Circulation / Q000502:physiology*; D011653:Pulmonary Diffusing Capacity; D012016:Reference Values; D012146:Rest / Q000502:physiology*; D012995:Solubility; D014937:Work / Q000502:physiology*
chemical_list: D002073:Butanes; D006586:Hexanes; D010420:Pentanes; C026385:n-hexane; C094659:2-methylpentane; C094658:2,3-dimethylbutane