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Article
March 11, 1996

Changes in Lp(a) Lipoprotein and Lipid Levels After Cessation of Female Sex Hormone Production and Estrogen Replacement Therapy

Author Affiliations

From the Division of Cardiology, Department of Internal Medicine, Chung-Ang University Medical Center (Drs Kim, Ryu, and Ryoo), and the Department of Obstetrics and Gynecology, Cheil General Hospital (Dr Park), Seoul, Korea, and the Korean Institute of Science and Technique, Taejeon (Dr Kwak).

Arch Intern Med. 1996;156(5):500-504. doi:10.1001/archinte.1996.00440050046005
Abstract

Objective:  To investigate the serial changes in Lp(a) lipoprotein levels with the loss of female sex hormones by surgical menopause and with estrogen replacement therapy in the same women.

Patients and Methods:  Forty-four premenopausal women who underwent a transabdominal hysterectomy (TAH) because of benign gynecological disorders were divided into two groups: women who underwent a TAH and unilateral salpingo-oophorectomy (n=31) and women who underwent a TAH and bilateral salpingo-oophorectomy (n=13). In the group of women who underwent a TAH and bilateral salpingo-oophorectomy, 0.625 mg of conjugated equine estrogen was given daily 2 months after the operation. The levels of Lp(a) lipoprotein and lipids were measured before and at 2 and 4 months after the operation.

Results:  In the group of women who underwent a TAH and bilateral salpingo-oophorectomy, the mean (±SD) concentration of Lp(a) lipoprotein was increased by 24.5% from 0.48±0.47 mmol/L (18.4± 18.3 mg/dL) to 0.59±0.54 mmol/L (22.9±21.0 mg/dL) after 2 months (P<.05), and it was reduced by 30.6% to 0.41±0.51 mmol/L (15.9±20.1 mg/dL) (P<.005) with therapy with conjugated equine estrogen (Premarin). The Lp(a) lipoprotein levels were not changed in the group of women who underwent a TAH and unilateral salpingooophorectomy. In the group of women who underwent a TAH and bilateral salpingo-oophorectomy, the high-density lipoprotein cholesterol level showed a trend of increase after 2 months from 1.45±0.48 mmol/L (56.1 ±18.5 mg/dL) to 1.58±0.39 mmol/L (61.2±15.1 mg/dL) without statistical significance, and it revealed a significant elevation to 1.76±0.43 mmol/L (68.2± 16.8 mg/dL) with therapy with conjugated equine estrogen (Premarin) compared with that of the basal level (P<.05).

Conclusions:  The Lp(a) lipoprotein levels appear to be closely associated with female sex hormones. This association might play a pivotal role in postmenopausal increases of atherosclerotic diseases and cardioprotective effect of estrogen in postmenopausal women.(Arch Intern Med. 1996;156:500-504)

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