TerbutalineAdrenergic beta-AgonistsTocolytic AgentsNebulizers and VaporizersBronchodilator AgentsAdministration, InhalationBudesonideAdrenergic beta-2 Receptor AgonistsAerosolsButoxamineEthanolaminesPeak Expiratory Flow RatePregnenedionesAsthmaAlbuterolMetaproterenolFenoterolReceptors, Adrenergic, beta-2Forced Expiratory VolumeButylaminesHigh-Throughput Nucleotide SequencingPrenalterolMaximal Expiratory Flow RateCapillary Leak SyndromeMagnetocardiographyChlorofluorocarbonsDouble-Blind MethodReceptors, Adrenergic, betaPowders