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The objective of this study is to examine the effects of thiazide diuretics, plus medium-dose losartan versus maximal-dose angiotensin II receptor blockers (ARBs) on blood pressure (BP) in Japanese patients with uncontrolled hypertension despite the use of medium-dose ARBs. Hypertensive patients in whom BP was inadequately controlled by treatment with medium-dose ARBs alone or with calcium-channel blockers were enrolled. Patients were randomly assigned to a fixed-dose combination of 50 mg per day losartan and 12.5 mg per day hydrochlorothiazide (HCTZ; n=98), or to a maximal dose of current ARBs (n=95). The reduction in office BP from baseline was significantly larger in the losartan/HCTZ group than in the maximal-dose ARB group (systolic BP -22.7±13.7 vs. -11.7±13.0 mm Hg, diastolic BP -9.6±10.9 vs. -4.5±11.0 mm Hg; P&lt;0.01, respectively). The proportion of patients in whom the therapeutic target BP was achieved was greater in the losartan/HCTZ group than in the maximal-dose ARB group (59.2 vs. 26.3%; P&lt;0.001). Both early-morning and evening BP were controlled more effectively over 1 year of treatment in the losartan/HCTZ group than in the maximal-dose ARB group (the mean BP difference between the groups, early-morning: 5.6 mm Hg (P=0.001), evening: 3.8 mm Hg (P=0.049)). Adverse changes in serum potassium and uric acid were observed in the losartan/HCTZ group; however, both changes were very slight, and the values were still within the normal range. The concomitant usage of losartan and HCTZ had no influence on glucose metabolism and lipid profiles. Declines in plasma N-terminal pro-brain natriuretic peptide levels and urinary albumin excretion were observed in the losartan/HCTZ group, but not in the maximal-dose ARB group. Switching from medium-dose ARBs to losartan plus HCTZ reduced both office and home BP efficiently in patients with uncontrolled hypertension.

hypertension research

Comparison of medium-dose losartan/hydrochlorothiazide and maximal-dose angiotensin II receptor blockers in the treatment of Japanese patients with uncontrolled hypertension: the Kobe-CONNECT Study