Airway ObstructionIntestinal ObstructionAirway ResistanceUreteral ObstructionLung Diseases, ObstructiveForced Expiratory VolumeRespiratory Function TestsAsthmaLaryngeal DiseasesSpirometryAirway RemodelingVital CapacityTracheal StenosisBronchiNasal ObstructionLungBronchial DiseasesBronchitisRespiratory SystemPierre 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 CapacityTracheotomyVentricular Outflow ObstructionLaryngostenosisResidual VolumeIntubation, IntratrachealRespiratory MucosaHeliumLung Volume MeasurementsLarynxPeak Expiratory Flow RateDyspneaForced Expiratory Flow RatesLaryngeal EdemaAlbuterolMaximal Expiratory Flow RateBronchoalveolar Lavage FluidRespiratory HypersensitivityAdministration, InhalationEpisode of CarePulmonary EmphysemaFunctional Residual CapacityRespirationTracheostomyLacrimal Duct ObstructionEpiglottisAerosolsRespiratory SoundsTracheal NeoplasmsLaryngeal MasksInhalationHorse DiseasesMucusCoughHigh-Frequency Jet VentilationBronchial SpasmAirway ManagementPharynxSleep Apnea SyndromesSleep Apnea, ObstructiveTongue DiseasesLaryngoceleTreatment OutcomeAir PressureBronchographyTomography, X-Ray ComputedAtropine DerivativesFiber Optic TechnologyPlethysmographySmokingCroupLaryngoscopyContinuous Positive Airway PressureAuscultationEosinophilsSeverity of Illness IndexLaryngismusTime FactorsIpratropiumLung ComplianceHypopharynxMaximal Midexpiratory Flow RateSputumLung DiseasesRespiratory Muscles