Metered Dose InhalersNebulizers and VaporizersBronchodilator AgentsAdministration, InhalationAlbuterolDry Powder InhalersChlorofluorocarbonsAerosol PropellantsIpratropiumAerosolsInhalation SpacersFenoterolAsthmaBeclomethasonePowdersTerbutalineAnti-Asthmatic AgentsPulmonary Disease, Chronic ObstructiveBudesonideForced Expiratory VolumeHydrocarbons, FluorinatedAdrenergic beta-2 Receptor AgonistsAdrenergic beta-AgonistsScopolamine DerivativesEthanolaminesCholinergic AntagonistsPeak Expiratory Flow RateRespiratory System AgentsDouble-Blind MethodEquipment DesignCross-Over StudiesCromolyn SodiumPregnenedionesAndrostadienesChlorofluorocarbons, MethaneLung Diseases, ObstructiveHoarsenessAdrenal Cortex HormonesAtropine DerivativesBronchiolitisVital CapacityLungRespiratory TherapyParticle SizeDrug Delivery SystemsGlucocorticoidsRespiratory Function TestsRacepinephrineTreatment OutcomeIndansSpirometryDrug Administration ScheduleAnti-Inflammatory AgentsTechnetiumMetaproterenolBronchoconstrictionBronchiPregnadienediolsTechnology, PharmaceuticalBiological AvailabilityTherapeutic EquivalencyMuscarinic AntagonistsChemistry, PharmaceuticalTheophyllineDrug CombinationsDrug Therapy, CombinationAirway ObstructionExpectorantsBronchitisDyspneaAirway ResistanceDose-Response Relationship, DrugQuinolonesOxygen Inhalation TherapyHistamine AgentsHydrocortisoneAntitussive AgentsDelayed-Action PreparationsGlycopyrrolateDiatomaceous EarthAminophyllineSympathomimeticsRespiratory SoundsCoughSeverity of Illness IndexAcute DiseaseMethacholine ChlorideBronchial Provocation TestsPatient Education as TopicTime FactorsPractice Guidelines as TopicFunctional Residual CapacityRandomized Controlled Trials as TopicSteroidsXanthinesReceptors, Adrenergic, beta-2Respiration DisordersRespiration, ArtificialPatient Compliance