we found significant differences in circulating norepinephrine concentrations between a heparin-pretreatment group ( 1.89 +/- 0.39 microgram/liter ) and the control group ( 9.83 +/- 4.64 microgram/liter ) , but none with respect to epinephrine .
C0028351
norepinephrine
C0014563
epinephrine