left ventricular hypertrophy and pumping function were studied after antihypertensive treatment with a beta-receptor blocker ( metoprolol ) , an arteriolar vasodilator ( hydralazine ) , and a calcium channel blocker ( nifedipine ) had been instituted for a period of 20-40 weeks .
C2267010
arteriolar vasodilator
C0020223
hydralazine