Left ventricular mass and function before and after antihypertensive treatment.

We have studied the effect of blood pressure control upon left ventricular mass and function. Twenty hypertensive patients without clinical or electrocardiographic signs of cardiac involvement were given sequentially: placebo for two weeks; captopril (250 mg/day) for eight weeks; and captopril (125 mg/day), alone or combined with chlorthalidone (25 mg/day), for eight weeks. M-mode echocardiography was performed at the end of placebo period, after eight and after 16 weeks active treatment. Blood pressure was significantly reduced (p less than 0.01) by therapy, the maximum decrease being observed at the end of the study. Similarly, interventricular septal thickness, posterior wall thickness and left ventricular mass index showed a significant reduction (P less than 0.01 at the eighth and P less than 0.001 at the 16th week), while no changes were detected in left ventricular function. Furthermore, both wall stress index at end-diastole and end-systolic stress were significantly lowered by treatment (at the 16th week P less than 0.01 and P less than 0.001, respectively). Baseline systolic blood pressure was inversely correlated with the ratio of the left ventricular radius to posterior wall thickness (r = -0.97, P less than 0.001) but no relation was found between post-treatment fall in either systolic or diastolic blood pressure and left ventricular mass index. After treatment more patients showed normal left ventricular wall thickness in relation to systolic blood pressure. We conclude that in uncomplicated hypertensive patients captopril, either alone or combined with chlorthalidone, can reverse left ventricular hypertrophy by decreasing both septal and posterior wall thickness.(ABSTRACT TRUNCATED AT 250 WORDS)