Bronchial SpasmSpasmMetered Dose InhalersDry Powder InhalersNebulizers and VaporizersSpasms, InfantileAdministration, InhalationHemifacial SpasmChlorofluorocarbonsAerosol PropellantsPowdersBronchodilator AgentsAlbuterolCoronary VasospasmAerosolsInhalation SpacersAsthmaAnti-Asthmatic AgentsEsophageal Spasm, DiffuseBeclomethasoneBudesonideHydrocarbons, FluorinatedIpratropiumErgonovinePregnadienediolsEthanolaminesFenoterolTerbutalineEquipment DesignRespiratory System AgentsAngina Pectoris, VariantRespiratory TherapyPulmonary Disease, Chronic ObstructiveForced Expiratory VolumePeak Expiratory Flow RateFacial MusclesCross-Over StudiesChlorofluorocarbons, MethaneAdrenergic beta-AgonistsParticle SizePregnenedionesDouble-Blind MethodScopolamine DerivativesAdrenal Cortex HormonesAndrostadienesBlepharospasmPatient Education as Topic