Airway ObstructionBronchitisBronchitis, ChronicInfectious bronchitis virusIntestinal ObstructionAirway ResistanceLung Diseases, ObstructiveUreteral ObstructionForced Expiratory VolumeAsthmaRespiratory Function TestsSpirometryVital CapacityBronchiLaryngeal DiseasesAirway RemodelingTracheal StenosisLungNasal ObstructionBronchial DiseasesRespiratory SystemBronchoscopyPulmonary Disease, Chronic ObstructiveBronchial HyperreactivityPierre Robin SyndromeDuodenal ObstructionBronchodilator AgentsPlethysmography, Whole BodyMaximal Expiratory Flow-Volume CurvesPulmonary VentilationCoughBronchial Provocation TestsPulmonary EmphysemaBronchoconstrictionUrinary Bladder Neck ObstructionUrethral ObstructionChronic DiseaseTracheal DiseasesRespiratory MechanicsGastric Outlet ObstructionSputumRespiratory MucosaForced Expiratory Flow RatesRespiratory Tract DiseasesTotal Lung CapacityLung Volume MeasurementsDyspneaRespiratory SoundsVentricular Outflow ObstructionAlbuterolTracheotomyLaryngostenosisPeak Expiratory Flow RateMaximal Expiratory Flow RateResidual VolumeBronchoalveolar Lavage FluidSmokingMucusIntubation, IntratrachealEmphysemaHeliumAdministration, InhalationLarynxRespiratory HypersensitivityAerosolsLaryngeal EdemaAtropine DerivativesRespirationPulmonary Heart DiseaseIpratropiumCoronaviridaeFunctional Residual CapacityLung DiseasesCoronavirus InfectionsTracheostomyLacrimal Duct ObstructionEpiglottisTracheal NeoplasmsLaryngeal MasksInhalationHorse DiseasesBronchiectasisExpectorantsRespiration DisordersHigh-Frequency Jet VentilationTracheaBronchial SpasmAirway ManagementAcute DiseaseDustPharynxSleep Apnea, ObstructiveEosinophilsTongue DiseasesSleep Apnea SyndromesLaryngoceleMethacholine ChlorideAir PressureTomography, X-Ray ComputedBronchography