to explore the possibility that theophylline may act through adrenomedullary secretion of catecholamines , we examined the time courses of plasma norepinephrine ( ne ) , epinephrine ( e ) , and theophylline concentrations and peak expiratory flow ( pef ) in nine children with an acute exacerbation of asthma receiving a 72-hour constant infusion of aminophylline .
C0028351
norepinephrine
C0014563
epinephrine