Airway ObstructionIntestinal ObstructionAirway ResistanceUreteral ObstructionLung Diseases, ObstructiveForced Expiratory VolumeRespiratory Function TestsAsthmaLaryngeal DiseasesSpirometryAirway RemodelingVital CapacityTracheal StenosisBronchiNasal ObstructionLungBronchial DiseasesRespiratory SystemBronchitisPierre Robin SyndromeDuodenal ObstructionBronchial HyperreactivityPlethysmography, Whole BodyMaximal Expiratory Flow-Volume CurvesBronchoscopyPulmonary VentilationBronchoconstrictionUrinary Bladder Neck ObstructionUrethral ObstructionTracheal DiseasesBronchial Provocation TestsBronchodilator AgentsPulmonary Disease, Chronic ObstructiveGastric Outlet ObstructionRespiratory MechanicsTotal Lung CapacityVentricular Outflow ObstructionTracheotomyLaryngostenosisResidual VolumeRespiratory MucosaIntubation, IntratrachealHeliumLung Volume MeasurementsLarynxPeak Expiratory Flow RateForced Expiratory Flow RatesDyspneaLaryngeal EdemaAlbuterolMaximal Expiratory Flow RateBronchoalveolar Lavage FluidRespiratory HypersensitivityAdministration, InhalationPulmonary EmphysemaFunctional Residual CapacityTracheostomyLacrimal Duct ObstructionEpiglottisTracheal NeoplasmsAerosolsRespirationLaryngeal MasksInhalationHorse DiseasesMucusHigh-Frequency Jet VentilationCoughBronchial SpasmAirway ManagementRespiratory SoundsPharynxSleep Apnea, ObstructiveTongue DiseasesSleep Apnea SyndromesLaryngoceleAir PressureBronchographyAtropine DerivativesFiber Optic TechnologyPlethysmographyTomography, X-Ray ComputedCroupSmokingLaryngoscopyContinuous Positive Airway PressureAuscultationEosinophilsIpratropiumLung ComplianceLaryngismusHypopharynxMaximal Midexpiratory Flow RateRespiratory MusclesSputumTracheaEmphysemaMethacholine ChlorideLung DiseasesTreatment Outcome