they investigated therefore in 15 patients with essential hypertension ( eh ) and in three patients with pheochromocytoma the urinary excretion of free noradrenaline ( na ) , adrenaline ( a ) and dopamine ( da ) , the plasma renin activity ( pra ) , the aldosterone concentration ( pac ) and atrial natriuretic factor ( anf ) in plasma , using radioimmunoanalysis , always before and 24 hours after clonidine administration ( haemiton retardr ) by the oral route .
C0031511
pheochromocytoma
C0013030
dopamine