exchangeable sodium , blood volume , plasma norepinephrine ( ne ) , epinephrine , renin and aldosterone levels , and pressor responses to infused ne or angiotensin ii ( aii ) were assessed in ten patients with essential hypertension on placebo , following 6 to 8 weeks of calcium-antagonist nifedipine ( nif ) , 3 x 10 to 20 mg/day , and after 6 to 8 weeks on nif combined with the diuretic chlorthalidone ( chlor ) , 25 to 50 mg/day .
C0028351
norepinephrine
C0014563
epinephrine