to define the effects of circulating norepinephrine and epinephrine on cardiac function and to determine whether left ventricular function is influenced by parasympathetic mechanisms during catecholamine stimulation , hemodynamic changes were investigated in healthy young human subjects who were supine and awake during infusion of intravenous norepinephrine alone ( 125 ng/kg/min ) ( n = 6 ) , norepinephrine ( 125 ng/kg/min ) plus epinephrine ( 50 ng/kg/min ) ( n = 6 ) , and norepinephrine plus epinephrine plus parasympathetic blockade induced by atropine ( 2 mg intravenously ) ( n = 5 ) .
C0007412
catecholamine
C0028351
norepinephrine