AlbuterolMetered Dose InhalersNebulizers and VaporizersDry Powder InhalersBronchodilator AgentsAdministration, InhalationChlorofluorocarbonsAerosol PropellantsInhalation SpacersIpratropiumPowdersAsthmaAerosolsAnti-Asthmatic AgentsBeclomethasoneAdrenergic beta-2 Receptor AgonistsAdrenergic beta-AgonistsBudesonideHydrocarbons, FluorinatedRacepinephrineEquipment DesignBronchial SpasmOzone DepletionForced Expiratory VolumeRespiratory TherapyPulmonary Disease, Chronic ObstructiveDouble-Blind MethodPregnadienediolsEthanolaminesFenoterolTerbutalineBronchoconstrictionPeak Expiratory Flow RateRespiratory System AgentsRespiratory Therapy Department, HospitalAndrostadienesCross-Over StudiesAdrenal Cortex HormonesParticle SizeDrug CombinationsRespiratory Function TestsChlorofluorocarbons, MethaneDrug Delivery SystemsBronchiolitisPregnenedionesGlucocorticoidsDrug IncompatibilityTreatment OutcomeForced Expiratory Flow RatesMasksScopolamine DerivativesReceptors, Adrenergic, beta-2Models, AnatomicAirway ResistanceBronchial Provocation TestsPatient Education as Topic