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(Circulation. 2006;113:2201-2210.)
© 2006 American Heart Association, Inc.
Heart Failure |
From the University of Texas School of Public Health (B.R.D., L.B.P., K.D.), Houston; National, Heart, Lung, and Blood Institute (J.A.C., M.P.), Bethesda, Md; Wake Forest University School of Medicine (C.F., D.G.), Winston-Salem, NC; University of California at Irvine (S.F.), Irvine; University of Ottawa Heart Institute (F.L.), Ottawa, Ontario, Canada; Creighton Cardiac Center (S.M.), Omaha, Neb; Veterans Affairs Medical Center (V.P.), Washington, DC; University of Washington (A.E.), Seattle; Penderbrook Medical Center (J.G.), Fairfax, Va; Centro Cardiovascular de Caguas (P.C.), Caguas, Puerto Rico; and University of Minnesota (R.C.), Minneapolis.
Correspondence to Barry R. Davis, MD, PhD, The University of Texas School of Public Health, 1200 Herman Pressler St, E-809, Houston, TX 77030. E-mail barry.r.davis{at}uth.tmc.edu
Received February 18, 2005; revision received February 24, 2006; accepted February 24, 2006.
Background Hypertension is a major cause of heart failure (HF) and is antecedent in 91% of cases. The Antihypertensive and Lipid-Lowering Treatment to Prevent Heart Attack Trial (ALLHAT) stipulated assessment of the relative effect of chlorthalidone, lisinopril, and amlodipine in preventing HF.
Methods and Results ALLHAT was a double-blind, randomized, clinical trial in 33 357 high-risk hypertensive patients aged
55 years. Hospitalized/fatal HF outcomes were examined with proportional-hazards models. Relative risks (95% confidence intervals; P values) of amlodipine or lisinopril versus chlorthalidone were 1.35 (1.21 to 1.50; <0.001) and 1.11 (0.99 to 1.24; 0.09). The proportional hazards assumption of constant relative risk over time was not valid. A more appropriate model showed relative risks of amlodipine or lisinopril versus chlorthalidone during year 1 were 2.22 (1.69 to 2.91; <0.001) and 2.08 (1.58 to 2.74; <0.001), and after year 1, 1.22 (1.08 to 1.38; P=0.001) and 0.96 (0.85 to 1.10; 0.58). There was no significant interaction between prior medication use and treatment. Baseline blood pressures were equivalent (146/84 mm Hg) and at year 1 were 137/79, 139/79, and 140/80 mm Hg in those given chlorthalidone, amlodipine, and lisinopril. At 1 year, use of added open-label atenolol, diuretics, angiotensin-converting enzyme inhibitors, and calcium channel blockers in the treatment groups was similar.
Conclusions HF risk decreased with chlorthalidone versus amlodipine or lisinopril use during year 1. Subsequently, risk for those individuals taking chlorthalidone versus amlodipine remained decreased but less so, whereas it was equivalent to those given lisinopril. Prior medication use, follow-up blood pressures, and concomitant medications are unlikely to explain most of the HF differences. Diuretics are superior to calcium channel blockers and, at least in the short term, angiotensin-converting enzyme inhibitors in preventing HF in hypertensive individuals.
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