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Original Article
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Volume 340:677-684 March 4, 1999 Number 9
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Effects of Calcium-Channel Blockade in Older Patients with Diabetes and Systolic Hypertension
Jaakko Tuomilehto, M.D., Daiva Rastenyte, M.D., Willem H. Birkenhäger, M.D., Lutgarde Thijs, B.Sc., Riitta Antikainen, M.D., Christopher J. Bulpitt, M.D., Astrid E. Fletcher, Ph.D., Françoise Forette, M.D., Adiv Goldhaber, M.D., Paolo Palatini, M.D., Cinzia Sarti, M.D., Robert Fagard, M.D., Jan A. Staessen, M.D., Ph.D., for The Systolic Hypertension in Europe Trial Investigators

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ABSTRACT

Background Recent reports suggest that calcium-channel blockers may be harmful in patients with diabetes and hypertension. We previously reported that antihypertensive treatment with the calcium-channel blocker nitrendipine reduced the risk of cardiovascular events. In this post hoc analysis, we compared the outcome of treatment with nitrendipine in diabetic and nondiabetic patients.

Methods After stratification according to center, sex, and presence or absence of previous cardiovascular complications, 4695 patients (age, >=60 years) with systolic blood pressure of 160 to 219 mm Hg and diastolic pressure below 95 mm Hg were randomly assigned to receive active treatment or placebo. Active treatment consisted of nitrendipine (10 to 40 mg per day) with the possible addition or substitution of enalapril (5 to 20 mg per day) or hydrochlorothiazide (12.5 to 25 mg per day) or both, titrated to reduce the systolic blood pressure by at least 20 mm Hg and to less than 150 mm Hg. In the control group, matching placebo tablets were administered similarly.

Results At randomization, 492 patients (10.5 percent) had diabetes. After a median follow-up of two years, the systolic and diastolic blood pressures in the placebo and active-treatment groups differed by 8.6 and 3.9 mm Hg, respectively, among the diabetic patients. Among the 4203 patients without diabetes, systolic and diastolic pressures differed by 10.3 and 4.5 mm Hg, respectively, in the two groups. After adjustment for possible confounders, active treatment was found to have reduced overall mortality by 55 percent (from 45.1 deaths per 1000 patients to 26.4 deaths per 1000 patients), mortality from cardiovascular disease by 76 percent, all cardiovascular events combined by 69 percent, fatal and nonfatal strokes by 73 percent, and all cardiac events combined by 63 percent in the group of patients with diabetes. Among the nondiabetic patients, active treatment decreased all cardiovascular events combined by 26 percent and fatal and nonfatal strokes by 38 percent. In the group of patients receiving active treatment, reductions in overall mortality, mortality from cardiovascular disease, and all cardiovascular events were significantly larger among the diabetic patients than among the nondiabetic patients (P=0.04, P=0.02, and P=0.01, respectively).

Conclusions Nitrendipine-based antihypertensive therapy is particularly beneficial in older patients with diabetes and isolated systolic hypertension. Thus, our findings do not support the hypothesis that the use of long-acting calcium-channel blockers may be harmful in diabetic patients.


Source Information

From the National Public Health Institute, Helsinki, Finland (J.T., C.S.); the Institute of Cardiology, Kaunas, Lithuania (D.R.); Erasmus University, Rotterdam, the Netherlands (W.H.B.); the Hypertension and Cardiovascular Rehabilitation Unit, University of Leuven, Leuven, Belgium (L.T., R.F.); the Health Center Hospital of Oulu and the Department of Internal Medicine, Oulu University Hospital, Oulu, Finland (R.A.); Hammersmith Hospital, Imperial College, London (C.J.B.); the London School of Hygiene and Tropical Medicine, London (A.E.F.), Hôpital Broca, Paris (F.F.); Ranana, Israel (A.G.); and the Institute of Clinical Medicine, Padua, Italy (P.P.). Jan A. Staessen, M.D., Ph.D., Hypertension and Cardiovascular Rehabilitation Unit, Department of Molecular and Cardiovascular Research, University of Leuven, Leuven, Belgium, was also an author.

Address reprint requests to Dr. Jan A. Staessen at the Coordinating Office of the Syst-Eur Trial, Hypertension and Cardiovascular Rehabilitation Unit, Department of Molecular and Cardiovascular Research, Campus Gasthuisberg, University of Leuven, Herestraat 49, B-3000 Leuven, Belgium, or at jan.staessen{at}med.kuleuven.ac.be.

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Related Letters:

Calcium-Channel Blockade and Hypertension
Salpeter S., Tuomilehto J., Staessen J. A., Birkenhäger W. H.
Extract | Full Text  
N Engl J Med 1999; 341:372-373, Jul 29, 1999. Correspondence

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