TerbutalineInfant, NewbornAdrenergic beta-AgonistsAnimals, NewbornTocolytic AgentsNebulizers and VaporizersBronchodilator AgentsAdministration, InhalationBudesonideAdrenergic beta-2 Receptor AgonistsAerosolsInfant, Newborn, DiseasesButoxamineEthanolaminesPeak Expiratory Flow RatePregnenedionesAsthmaAlbuterolMetaproterenolFenoterolReceptors, Adrenergic, beta-2Forced Expiratory VolumeButylaminesNeonatal ScreeningPrenalterolMaximal Expiratory Flow RateCapillary Leak SyndromeMagnetocardiographyChlorofluorocarbonsDouble-Blind MethodReceptors, Adrenergic, betaPowdersPulmonary AlveoliPropranolol