in nine pentobarbital-anesthetized opened-chest dogs without coronary ligation , myocardial catecholamine at 2.5 h after pentobarbital ( i ) consisted mainly of norepinephrine ( 87 % total catecholamine ) , ( ii ) showed a base to apex gradient in norepinephrine ( 1.44 +/- 0.10 vs. 1.03 +/- 0.10 micrograms/g , p less than 0.05 ) and dopamine ( 0.20 +/- 0.03 vs. 0.12 +/- 0.02 micrograms/g , p less than 0.05 ) but not epinephrine ( 0.017 vs. 0.016 micrograms/g ) , and ( iii ) showed no difference in norepinephrine , dopamine , or epinephrine across basal , mid , and apical left ventricular transverse planes spanning the vascular territories of the two coronary arteries .
C0028351
norepinephrine
C0014563
epinephrine