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The angiotensin II receptor antagonist telmisartan reduces urinary albumin excretion in patients with isolated systolic hypertension: results of a randomized, double-blind, placebo-controlled trial

Objective To examine the effect of telmisartan or hydrochlorothiazide on the control of urinary albumin excretion (UAE) in patients with isolated systolic hypertension (ISH) unselected for albuminuria in a pre-planned substudy of a large, multicentre, double-blind, placebo-controlled, randomized study. Methods The Angiotensin II Receptor Antagonist Micardis in Isolated Systolic hypertension (ARAMIS) study compared the antihypertensive efficacy after 6 weeks of once-daily fixed doses of telmisartan 20, 40 or 80 mg versus hydrochlorothiazide 12.5 mg or placebo in patients (n = 1039, aged 35–84 years) with ISH (seated blood pressure 150–179/< 90 mmHg). The prospective substudy analysed UAE using spot morning samples. Results Urinary albumin (> 2.2–901.6 mg/l) was detected at baseline in 614 out of 918 patients who were included in the substudy analysis. In the telmisartan group (n = 354, all doses combined), a median reduction in UAE from a baseline of 14.1% [95% confidence interval (CI) 7.3, 21.8] was observed versus 1.1% (95% CI −13.5 to 16.0) and 2.7% (95% CI −0.9 to 19.9) in the hydrochlorothiazide (n = 140) and placebo (n = 120) groups, respectively. The difference between telmisartan and hydrochlorothiazide was significant (P = 0.017). Reductions in UAE with telmisartan were observed in patients with baseline normoalbuminuria, microalbuminuria or macroalbuminuria. Telmisartan and hydrochlorothiazide produced comparable reductions in systolic blood pressure in these patients. Conclusion In patients with ISH unselected for baseline albuminuria, telmisartan 20–80 mg after 6 weeks' treatment afforded significantly greater lowering of UAE than hydrochlorothiazide 12.5 mg, irrespective of the baseline UAE, and despite comparable reductions in systolic blood pressure with both drugs.