Airway ObstructionIntestinal ObstructionAirway ResistanceUreteral ObstructionLung Diseases, ObstructiveForced Expiratory VolumeRespiratory Function TestsAsthmaSpirometryLaryngeal DiseasesAirway RemodelingVital CapacityTracheal StenosisBronchiNasal ObstructionLungBronchial DiseasesRespiratory SystemBronchitisPierre Robin SyndromeBronchial HyperreactivityDuodenal ObstructionPlethysmography, Whole BodyMaximal Expiratory Flow-Volume CurvesBronchoscopyPulmonary VentilationBronchoconstrictionUrinary Bladder Neck ObstructionUrethral ObstructionBronchodilator AgentsTracheal DiseasesPulmonary Disease, Chronic ObstructiveBronchial Provocation TestsGastric Outlet ObstructionRespiratory MechanicsTotal Lung CapacityVentricular Outflow ObstructionTracheotomyLaryngostenosisResidual VolumeRespiratory MucosaIntubation, IntratrachealHeliumLung Volume MeasurementsLarynxPeak Expiratory Flow RateDyspneaAlbuterolForced Expiratory Flow RatesLaryngeal EdemaMaximal Expiratory Flow RateBronchoalveolar Lavage FluidAdministration, InhalationRespiratory HypersensitivityPulmonary EmphysemaFunctional Residual CapacityRespirationTracheostomyLacrimal Duct ObstructionEpiglottisAerosolsTracheal NeoplasmsInhalationHorse DiseasesLaryngeal MasksMucusHigh-Frequency Jet VentilationCoughRespiratory SoundsBronchial SpasmAirway ManagementSleep Apnea, ObstructivePharynxSleep Apnea SyndromesTongue DiseasesLaryngoceleSeverity of Illness IndexAir PressureTreatment OutcomeBronchographySmokingTomography, X-Ray ComputedAtropine DerivativesPlethysmographyFiber Optic TechnologyCroupContinuous Positive Airway PressureAuscultationLaryngoscopyEosinophilsIpratropiumLung ComplianceLaryngismusHypopharynxMaximal Midexpiratory Flow RateSputumRespiratory MusclesMethacholine ChlorideTracheaLung Diseases