Background Postmenopausal estrogen therapy has favorable effectson serum lipoproteins in women with normal serum lipid levels,but the effect of combined estrogen and progestin therapy onlipoproteins in women with hypercholesterolemia has not beendetermined, nor has it been directly compared with the effectof conventional lipid-lowering therapy.
Methods In a randomized crossover trial, we studied 58 postmenopausalwomen with fasting serum total cholesterol levels greater than250 mg per deciliter. Each woman received simvastatin (10 mgdaily) for eight weeks and postmenopausal hormone therapy (upto 1.25 mg of conjugated equine estrogens daily, along with5 mg of medroxyprogesterone acetate daily) for eight weeks,with an eight-week washout period between the two treatmentphases.
Results At base line, the mean (±SD) cholesterol valueswere as follows: total cholesterol, 305±39 mg per deciliter;high-density lipoprotein (HDL) cholesterol, 62±19 mgper deciliter; and low-density lipoprotein (LDL) cholesterol,217±39 mg per deciliter. For total cholesterol, the meandecrease with hormone therapy was 14 percent (95 percent confidenceinterval, 11 to 16 percent) and the mean decrease with simvastatinwas 26 percent (95 percent confidence interval, 23 to 29 percent).For LDL cholesterol, the mean decrease was 24 percent (95 percentconfidence interval, 20 to 28 percent) with hormone therapyand 36 percent (95 percent confidence interval, 32 to 40 percent)with simvastatin. The effect of simvastatin was significantlygreater than that of hormone therapy (P<0.001). HDL cholesterolincreased similarly with hormone therapy (mean increase, 7 percent;95 percent confidence interval, 2 to 12 percent) and simvastatin(mean increase, 7 percent; 95 percent confidence interval, 4to 10 percent). Triglyceride levels increased with hormone therapy(mean increase, 29 percent; 95 percent confidence interval,15 to 42 percent) but decreased with simvastatin (mean decrease,14 percent; 95 percent confidence interval, 8 to 20 percent).Lp(a) lipoprotein decreased with hormone therapy (mean decrease,27 percent; 95 percent confidence interval, 20 to 34 percent),but not with simvastatin.
Conclusions In postmenopausal women with hypercholesterolemia,therapy with estrogen plus progestin has beneficial effectson lipoprotein levels. Hormone therapy may be an effective alternativeto treatment with simvastatin, especially in women with normaltriglyceride levels.
Source Information
From the Jean Hailes Foundation (G.M.D., S.R.D.); the Department of Cardiology, Austin and Repatriation Medical Centre (G.M.D., J.A.J.); and the Department of Mathematics, Monash University (P.I.M.) all in Melbourne, Victoria, Australia.
Address reprint requests to Dr. Darling at the Jean Hailes Foundation, 291 Clayton Rd., Clayton, Victoria 3168, Australia.
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