Residual VolumeTotal Lung CapacityLung Volume MeasurementsFunctional Residual CapacityBlood VolumePlethysmographyVital CapacityRespiratory Function TestsForced Expiratory VolumePulmonary EmphysemaLungPlethysmography, Whole BodyRespiratory MechanicsSpirometryRespiratory AspirationGallbladder EmptyingPulmonary Diffusing CapacityUrinationUrodynamicsLung ComplianceGastric EmptyingEnteral NutritionIntubation, GastrointestinalNeoplasm, ResidualPlasma VolumeUrinary RetentionStroke VolumeExpiratory Reserve VolumeInhalationPressurePneumonectomyBronchoconstrictor AgentsUrinary BladderGastrointestinal ContentsEmphysemaDiaphragmVenous InsufficiencyTime FactorsRespiratory MusclesUrinary Bladder DiseasesMaximal Expiratory Flow RateErythrocyte VolumePulmonary VentilationHeliumDyspneaLung Diseases, ObstructiveTreatment OutcomeAirway ResistanceUrination DisordersTomography, X-Ray ComputedForced Expiratory Flow RatesBlood Volume DeterminationPulmonary Disease, Chronic ObstructiveRespiratory Physiological PhenomenaProspective StudiesRespirationMethacholine ChlorideMagnetic Resonance ImagingAirway ObstructionReproducibility of ResultsUrinary Bladder Neck ObstructionProstatic HyperplasiaBronchodilator AgentsCritical IllnessUrethraNebulizers and VaporizersReference ValuesRespiration, ArtificialFollow-Up StudiesImaging, Three-DimensionalBronchoscopyStatistics, NonparametricOrgan SizeSeverity of Illness IndexAnalysis of VarianceAerosolsRetrospective StudiesAsthmaAdministration, InhalationLung DiseasesImage Processing, Computer-AssistedCross-Over StudiesOxygenCell SizeBrainDouble-Blind MethodExercise TestChronic DiseaseSensitivity and SpecificitySmokingAtrophyHemodynamicsImage Interpretation, Computer-AssistedCardiac OutputPlasma Substitutes