AlbuterolAsthmaBronchodilator AgentsNebulizers and VaporizersAdministration, InhalationAnti-Asthmatic AgentsAdrenergic beta-2 Receptor AgonistsIpratropiumAdrenergic beta-AgonistsInhalation SpacersMetered Dose InhalersRacepinephrineBronchial SpasmForced Expiratory VolumeBronchoconstrictionOzone DepletionChlorofluorocarbonsAerosol PropellantsPeak Expiratory Flow RateBeclomethasoneRespiratory SoundsAerosolsRespiratory Function TestsBronchial HyperreactivityAsthma, Exercise-InducedAdrenal Cortex HormonesRespiratory Therapy Department, HospitalBronchiolitisForced Expiratory Flow RatesBudesonideReceptors, Adrenergic, beta-2Double-Blind MethodAsthma, OccupationalSpirometryAirway ResistanceDrug IncompatibilityPulmonary Disease, Chronic ObstructiveEquipment DesignBronchiAllergensLungHypersensitivityRespiratory TherapyMasksGlucocorticoidsAndrostadienesVital CapacityHypersensitivity, ImmediateSeverity of Illness IndexModels, AnatomicOvalbuminTreatment OutcomeMyasthenic Syndromes, CongenitalRhinitisMethacholine ChlorideEquipment SafetyBronchial Provocation TestsRhinitis, Allergic, PerennialStereoisomerismManikinsEmergency Service, HospitalDrug CombinationsEosinophilsLeukotriene AntagonistsHydrocarbons, FluorinatedSkin TestsPropanolaminesIntubation, IntratrachealMissouriPrevalenceTracheaStatus AsthmaticusBronchoconstrictor AgentsAirway RemodelingDrug Administration ScheduleDrug Therapy, CombinationBronchitisRespiratory MechanicsQuestionnairesPlethysmographyRespiration, ArtificialRespiratory HypersensitivityPyroglyphidaeAcute DiseasePediatricsTime FactorsPulmonary MedicineAsthma, Aspirin-InducedCross-Over StudiesAnesthesia, InhalationSputumBronchoalveolar Lavage FluidUnited StatesPlacebosExhalationDose-Response Relationship, DrugAirway ObstructionCoughAir Pollution, IndoorStatistics, Nonparametric