Nebulizers and VaporizersAlbuterolBronchodilator AgentsAdministration, InhalationAerosolsIpratropiumInhalation SpacersMetered Dose InhalersAdrenergic beta-2 Receptor AgonistsAdrenergic beta-AgonistsRacepinephrineAsthmaChlorofluorocarbonsBronchial SpasmAerosol PropellantsEquipment DesignHeparitin SulfateOzone DepletionRespiratory TherapyMasksBronchoconstrictionForced Expiratory VolumeDrug IncompatibilityModels, AnatomicAnti-Asthmatic AgentsRespiratory Therapy Department, HospitalBronchial Provocation TestsBronchiolitisParticle SizeForced Expiratory Flow RatesManikinsDermatan SulfateReceptors, Adrenergic, beta-2Double-Blind MethodBudesonideDrug Delivery SystemsPulmonary Disease, Chronic ObstructiveBeclomethasoneSulfatesHeparan Sulfate ProteoglycansRespiratory Function TestsAirway ResistanceRespiration, ArtificialKeratan SulfateChondroitin Sulfate ProteoglycansPeak Expiratory Flow RateLungMyasthenic Syndromes, Congenital