Airway ObstructionTracheaIntestinal ObstructionAirway ResistanceUreteral ObstructionLung Diseases, ObstructiveTracheal StenosisForced Expiratory VolumeRespiratory Function TestsAsthmaLaryngeal DiseasesBronchiTracheal NeoplasmsSpirometryAirway RemodelingVital CapacityTracheal DiseasesLungBronchial DiseasesRespiratory SystemNasal ObstructionBronchoscopyBronchitisBronchial HyperreactivityPierre Robin SyndromeDuodenal ObstructionPlethysmography, Whole BodyMaximal Expiratory Flow-Volume CurvesBronchoconstrictionPulmonary VentilationTracheotomyIntubation, IntratrachealLarynxBronchodilator AgentsUrinary Bladder Neck ObstructionBronchial Provocation TestsUrethral ObstructionRespiratory MechanicsPulmonary Disease, Chronic ObstructiveGastric Outlet ObstructionRespiratory MucosaTotal Lung CapacityVentricular Outflow ObstructionMucusLaryngostenosisResidual VolumeLung Volume MeasurementsAlbuterolHeliumTracheostomyMuscle, SmoothDyspneaBronchoalveolar Lavage FluidPeak Expiratory Flow RateRespiratory HypersensitivityForced Expiratory Flow RatesLaryngeal EdemaEpiglottisAerosolsMaximal Expiratory Flow RateAdministration, InhalationLaryngeal MasksRespirationHigh-Frequency Jet VentilationPulmonary EmphysemaCoughFunctional Residual CapacityBronchial SpasmInhalationAirway ManagementLacrimal Duct ObstructionHorse DiseasesGuinea PigsRespiratory SoundsPharynxFiber Optic TechnologyBronchographyLaryngoscopyAir PressureHistamineSleep Apnea, ObstructiveTongue DiseasesSleep Apnea SyndromesLaryngoceleTomography, X-Ray ComputedMethacholine ChlorideLung ComplianceAuscultationAtropine DerivativesSmokingPlethysmographyRespiratory Physiological PhenomenaCroupEosinophilsContinuous Positive Airway PressureIntubationIpratropiumRespiratory MusclesGoiter, SubsternalLaryngismus