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Original Article
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Volume 349:523-534 August 7, 2003 Number 6
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Estrogen plus Progestin and the Risk of Coronary Heart Disease
JoAnn E. Manson, M.D., Dr.P.H., Judith Hsia, M.D., Karen C. Johnson, M.D., M.P.H., Jacques E. Rossouw, M.D., Annlouise R. Assaf, Ph.D., Norman L. Lasser, M.D., Ph.D., Maurizio Trevisan, M.D., Henry R. Black, M.D., Susan R. Heckbert, M.D., Ph.D., Robert Detrano, M.D., Ph.D., Ora L. Strickland, Ph.D., Nathan D. Wong, Ph.D., John R. Crouse, M.D., Evan Stein, M.D., Mary Cushman, M.D., for the Women's Health Initiative Investigators

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ABSTRACT

Background Recent randomized clinical trials have suggested that estrogen plus progestin does not confer cardiac protection and may increase the risk of coronary heart disease (CHD). In this report, we provide the final results with regard to estrogen plus progestin and CHD from the Women's Health Initiative (WHI).

Methods The WHI included a randomized primary-prevention trial of estrogen plus progestin in 16,608 postmenopausal women who were 50 to 79 years of age at base line. Participants were randomly assigned to receive conjugated equine estrogens (0.625 mg per day) plus medroxyprogesterone acetate (2.5 mg per day) or placebo. The primary efficacy outcome of the trial was CHD (nonfatal myocardial infarction or death due to CHD).

Results After a mean follow-up of 5.2 years (planned duration, 8.5 years), the data and safety monitoring board recommended terminating the estrogen-plus-progestin trial because the overall risks exceeded the benefits. Combined hormone therapy was associated with a hazard ratio for CHD of 1.24 (nominal 95 percent confidence interval, 1.00 to 1.54; 95 percent confidence interval after adjustment for sequential monitoring, 0.97 to 1.60). The elevation in risk was most apparent at one year (hazard ratio, 1.81 [95 percent confidence interval, 1.09 to 3.01]). Although higher base-line levels of low-density lipoprotein cholesterol were associated with an excess risk of CHD among women who received hormone therapy, higher base-line levels of C-reactive protein, other biomarkers, and other clinical characteristics did not significantly modify the treatment-related risk of CHD.

Conclusions Estrogen plus progestin does not confer cardiac protection and may increase the risk of CHD among generally healthy postmenopausal women, especially during the first year after the initiation of hormone use. This treatment should not be prescribed for the prevention of cardiovascular disease.


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From the Division of Preventive Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston (J.E.M.); the Department of Medicine, George Washington University, Washington, D.C. (J.H.); the Department of Preventive Medicine, University of Tennessee Health Science Center, Memphis (K.C.J.); the Program Office, National Heart, Lung, and Blood Institute, Bethesda, Md. (J.E.R.); Memorial Hospital, Brown Medical School, Pawtucket, R.I. (A.R.A.); the Preventive Cardiology Program, New Jersey Medical School, Newark (N.L.L.); the Department of Social and Preventive Medicine, University at Buffalo, Buffalo, N.Y. (M.T.); the Department of Preventive Medicine, Rush–Presbyterian–St. Luke's Medical Center, Chicago (H.R.B.); the Department of Epidemiology, University of Washington, Seattle (S.R.H.); the Division of Cardiology, Harbor–UCLA Research and Education Institute, Torrance, Calif. (R.D.); the Woodruff School of Nursing, Emory University, Atlanta (O.L.S.); the Heart Disease Prevention Program, University of California, Irvine (N.D.W.); the Department of Medicine, Wake Forest University, Winston-Salem, N.C. (J.R.C.); Medical Research Laboratories International, Highland Heights, Ky. (E.S.); and the Departments of Medicine and Pathology, University of Vermont, Burlington (M.C.).

Address reprint requests to Dr. Manson at the Divison of Preventive Medicine, Brigham and Women's Hospital, 900 Commonwealth Ave., Boston, MA 02215, or at jmanson{at}rics.bwh.harvard.edu.

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Related Letters:

Hormone Therapy and Cardiovascular Disease
Kannel W. B., Levy D., Sullivan J. L., Bailar J. C. III
Extract | Full Text | PDF  
N Engl J Med 2003; 349:2075-2076, Nov 20, 2003. Correspondence

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