because of divergent reports of catecholamine secretion with the patient positioned upright in patients with pheochromocytomas , we have measured plasma norepinephrine ( ne ) and epinephrine ( e ) by radioenzymatic assay , both in normal subjects ( eight ) and in patients with pheochromocytomas ( 12 ) during three conditions that stimulate release of catecholamines .
C0028351
norepinephrine
C0014563
epinephrine