intra-arterial cumulative dose infusions of epinephrine and norepinephrine ( 0.6 , 1.6 and 4.0 ng kg-1 min-1 ) were given in the presence of saline , the selective alpha 1-antagonist doxazosin ( 0.1 microgram kg min-1 ) the selective alpha 2-antagonist yohimbine ( 1.0 microgram kg min-1 ) and the combination of both antagonists . beta-adrenoceptor-mediated effects were prevented by a concomitant i.a . infusion of propranolol ( 1.0 microgram kg-1 min-1 ) .
C0014563
epinephrine
C0028351
norepinephrine