following atropine , vagal stimulation failed to raise the threshold dose of norepinephrine ( 16.8 +/- 2.4 vs. 18.3 +/- 3.3 micrograms , nonsignificant , n = 6 ) or epinephrine ( 15.5 +/- 2.0 vs. 16.0 +/- 2.3 micrograms , nonsignificant , n = 5 ) .
C0028351
norepinephrine
C0014563
epinephrine