Airway ObstructionHorse DiseasesHorsesLung Diseases, ObstructiveAirway ResistanceRecurrenceAirway RemodelingIntestinal ObstructionAsthmaUreteral ObstructionBronchiForced Expiratory VolumeRespiratory Function TestsRespiratory SystemLungSpirometryLaryngeal DiseasesBronchial HyperreactivityVital CapacityTracheal StenosisNasal ObstructionBronchoconstrictionBronchial DiseasesBronchitisRespiratory MucosaBronchial Provocation TestsBronchoscopyPlethysmography, Whole BodyPulmonary VentilationAirway ManagementPierre Robin SyndromeRespiratory MechanicsMaximal Expiratory Flow-Volume CurvesDuodenal ObstructionBronchodilator AgentsTracheal DiseasesPulmonary Disease, Chronic ObstructiveIntubation, IntratrachealRespiratory HypersensitivityBronchoalveolar Lavage FluidUrinary Bladder Neck ObstructionTotal Lung CapacityUrethral ObstructionTracheotomyLaryngeal MasksLaryngostenosisLung Volume MeasurementsGastric Outlet ObstructionMucusLarynxHeliumResidual VolumeAdministration, InhalationVentricular Outflow ObstructionAlbuterolAerosolsPeak Expiratory Flow RateForced Expiratory Flow RatesContinuous Positive Airway PressureInhalationEpiglottisPharynxDyspneaPulmonary EmphysemaMaximal Expiratory Flow RateFunctional Residual CapacityRespirationLaryngeal EdemaTracheostomyAir PressureBronchial SpasmEosinophilsSleep Apnea, ObstructiveCoughBronchographyTracheal NeoplasmsMuscle, SmoothRespiratory SoundsLung ComplianceSleep Apnea SyndromesHigh-Frequency Jet VentilationFiber Optic TechnologyLacrimal Duct ObstructionRespiratory Physiological PhenomenaSputumCystic FibrosisTongue DiseasesHypopharynxLaryngocelePlethysmographySmokingTomography, X-Ray ComputedPositive-Pressure RespirationRespiratory MusclesHistamineLung DiseasesTidal VolumeBronchiolesEpithelial CellsAtropine Derivatives