Airway ObstructionIntestinal ObstructionAirway ResistanceUreteral ObstructionLung Diseases, ObstructiveForced Expiratory VolumeRespiratory Function TestsAsthmaLaryngeal DiseasesSpirometryAirway RemodelingVital CapacityTracheal StenosisBronchiNasal ObstructionLungBronchial DiseasesRespiratory SystemBronchitisPierre Robin SyndromeDuodenal ObstructionBronchial HyperreactivityBronchoscopyPlethysmography, Whole BodyMaximal Expiratory Flow-Volume CurvesPulmonary VentilationBronchoconstrictionUrinary Bladder Neck ObstructionUrethral ObstructionTracheal DiseasesBronchial Provocation TestsPulmonary Disease, Chronic ObstructiveBronchodilator AgentsGastric Outlet ObstructionRespiratory MechanicsTotal Lung CapacityVentricular Outflow ObstructionTracheotomyLaryngostenosisResidual VolumeRespiratory MucosaIntubation, IntratrachealHeliumLung Volume MeasurementsLarynxSensitivity and SpecificityDyspneaPeak Expiratory Flow RateBronchoalveolar Lavage FluidLaryngeal EdemaForced Expiratory Flow RatesAlbuterolMaximal Expiratory Flow RateRespiratory HypersensitivityAdministration, InhalationPulmonary EmphysemaFunctional Residual CapacityTomography, X-Ray ComputedHorse DiseasesEpiglottisTracheostomyLacrimal Duct ObstructionRespirationAerosolsTracheal NeoplasmsLaryngeal MasksInhalationMucusCoughDiagnostic ErrorsHigh-Frequency Jet VentilationRespiratory SoundsPharynxBronchial SpasmAirway ManagementSleep Apnea, ObstructiveTongue DiseasesSleep Apnea SyndromesLaryngoceleAir PressureFiber Optic TechnologyBronchographyTreatment OutcomeAuscultationAtropine DerivativesRetrospective StudiesPlethysmographySputumSmokingSeverity of Illness IndexLaryngoscopyCroupContinuous Positive Airway PressureLung DiseasesEosinophilsIpratropiumLaryngismusLung ComplianceHypopharynxMaximal Midexpiratory Flow Rate