Riley, D J Regional bronchoconstriction in asthma. 133Xenon washout scans following parenteral methacholine. [electronic resource] - Chest Dec 1976 - 715-8 p. digital Publication Type: Journal Article ISSN: 0012-3692 Standard No.: 10.1378/chest.70.6.715 doi Subjects--Topical Terms: AdultAirway ResistanceAsthma--diagnosisBronchi--physiopathologyHumansLung Volume MeasurementsMethacholine CompoundsPulmonary VentilationVentilation-Perfusion RatioXenon Radioisotopes