the concentrations of the three catecholamines in thoracic aorta plasma were not significantly changed by cardioaccelerator nerve stimulation.2 clonidine ( 20 mug/kg , i.v . ) , given during cardioaccelerator nerve stimulation , increased both mean aortic blood pressure and coronary sinus blood flow and decreased heart rate and coronary sinus venous plasma noradrenaline overflow.3 phentolamine ( 0.3 mg/kg , i.v . ) completely antagonized these effects of clonidine .
C0007412
catecholamines
C0028351
noradrenaline