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Effectiveness of enalapril in combination with low-dose hydrochlorothiazide versus enalapril alone for mild to moderate systemic hypertension in black patients.

Author(s): Middlemost SJ, Tager R, Davis J, Sareli P

Affiliation(s): Division of Cardiology, Baragwanath Hospital, Soweto, South Africa.

Publication date & source: 1994-06-01, Am J Cardiol., 73(15):1092-7.

Publication type: Clinical Trial; Randomized Controlled Trial

The importance of concomitant low-dose hydrochlorothiazide was assessed in black hypertensive patients treated with enalapril. Left ventricular (LV) mass and function, metabolic parameters, 24-hour ambulatory blood pressure (BP), exercise duration, and systolic BP response were evaluated before and after drug therapy. Enalapril 20 mg (group 1) or enalapril 20 mg plus hydrochlorothiazide 12.5 mg (single tablet; group 2) was given to 38 patients for 9 weeks in a double-blind, placebo-controlled, randomized study. LV mass measured 61 +/- 17 versus 102 +/- 23 g/m2, and 24-hour ambulatory BP measured 120 +/- 8/75 +/- 6 versus 155 +/- 12/100 +/- 6 mm Hg in matched control subjects (n = 40) versus hypertensive patients, respectively. No clinically important changes occurred in total cholesterol, serum uric acid or potassium in either group. Enalapril slightly reduced 24-hour ambulatory BP from 154 +/- 15/100 +/- 7 mm Hg to 148 +/- 19/96 +/- 11 mm Hg after treatment (p < 0.05 for systolic BP); systolic BP load (70% to 59%, p < 0.05), and diastolic BP load (67% to 60%, p = NS) decreased. Baseline BP decreased from 157 +/- 9/101 +/- 6 to 132 +/- 13/86 +/- 8 mm Hg (p < 0.0001); systolic BP load (64% to 29%, p < 0.0001), and diastolic BP load (64% to 33%, p < 0.0001) decreased in group 2. Exercise systolic BP was attenuated (p = 0.007, group 2; p = NS, group 1) and duration increased (p = NS) only in group 2.(ABSTRACT TRUNCATED AT 250 WORDS)

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