furthermore , mianserin reduced the pressor response to adrenaline.3 desipramine , maprotiline and mianserin , but not phentolamine enhanced the positive chronotropic effects of noradrenaline , without affecting those of isoprenaline.4 all four compounds abolished the clonidine-induced inhibition of heart rate responses to short term electrical stimulation of the spinal cord .
C1372804
positive chronotropic
C0022245
isoprenaline