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  • Title: Renoprotective effect and cost-effectiveness of using benidipine, a calcium channel blocker, to lower the dose of angiotensin receptor blocker in hypertensive patients with albuminuria.
    Author: Saito F, Fujita H, Takahashi A, Ichiyama I, Harasawa S, Oiwa K, Takahashi N, Otsuka Y, Uchiyama T, Kanmatsuse K, Kushiro T.
    Journal: Hypertens Res; 2007 Jan; 30(1):39-47. PubMed ID: 17460370.
    Abstract:
    In hypertensive patients with chronic renal disease, angiotensin receptor blockers (ARBs) are among the first-line drugs, and calcium channel blockers (CCBs) are recommended as a second line. We examined the effects of two therapeutic strategies using ARBs and benidipine, a CCB, on blood pressure (BP), urinary albumin excretion (UAE), and cost-effectiveness in hypertensive patients with albuminuria. Patients whose BP was 140/90 mmHg or higher despite treatment with low- or medium-dose ARBs were assigned randomly to two groups. In Group A (n=14), the ARB dose was maximized and then benidipine was added until BP targets were reached (<130/85 mmHg). In Group B (n=18), benidipine was administered first and then the ARB dose was increased until BP targets were reached. The BP targets were achieved by ARB alone in 36% of Group A patients and by the addition of benidipine in 83% of Group B patients. Finally, BP decreased in each group, reaching the targets in 93% of Group A patients and 94% of Group B patients after a 4-month therapeutic period. UAE was decreased in both groups after a 4-month therapeutic period compared to the allocation period (-33+/-6% in Group A, -31+/-6% in Group B; p<0.001, respectively). The monthly drug cost was higher (11,426+/-880 vs. 8,955+/-410 yen, p=0.012) and the cost-effectiveness of antihypertensive treatment was lower (p=0.003) in Group A than in Group B. We conclude that the addition of benidipine to low- or medium-dose ARB is, in light of the renal protection and the cost-effectiveness of this approach, a useful therapeutic strategy for controlling BP in hypertensive patients with albuminuria.
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