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Effects of Four Different Hormone Replacement Therapy Regimens on Certain Cardiovascular Risk Factors

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Effects of Four Different Hormone Replacement Therapy Regimens on Certain Cardiovascular Risk Factors Turk J Med Sci 30 (2000) 469-473 @ T†BÜTAK Erdal MALATYALIOÚLU Arif K…K‚† Effects of Four Different Hormone Filiz F. YANIK Replacement Therapy Regimens on Tayfun ALPER Certain Cardiovascular Risk Factors significant changes in the systolic BP, FBG, Received: December 25, 1998 Abstract: This study was performed to serum total and LDL-cholesterol levels in any compare the effects of 4 different hormone group. Diastolic BP measurements were lower replacement therapy (HRT) protocols on in the E2-17-V+CA group; HDL-cholesterol certain cardiovascular risk factors. Eighty- levels increased in the conjugated E and E2- nine postmenopausal women were treated 17-V+CA groups; and triglyceride levels with oral conjugated estrogens, transdermal decreased in the tibolone group significantly 17 beta-E2, cyclic oral E2-17- (p<0.05). However, the differences between valerate+cyproterone acetate (E2-17-V+CA) the initial and post-treatment values of those or tibolone. Blood pressure (BP) parameters were not significant among the measurements, fasting blood glucose (FBG), treatment groups (p>0.05). Therefore, these serum total cholesterol, low density HRT protocols were not significantly different lipoprotein cholesterol (LDL), high density from one another in eliminating certain lipoprotein cholesterol (HDL) and cardiovascular risk factors. Department of Obstetrics and Gynecology, triglyceride levels at the 12th month were Faculty of Medicine, Ondokuz MayÝs compared with the pretreatment values in Key Words: Menopause, cardiovascular University, Samsun - Turkey each treatment group. There were no disease, estrogen, progesterone, tibolone rather than coagulation, decreased vascular resistance Introduction and improved blood flow through endothelium-depen- Cardiovascular disease, especially coronary heart dis- dent and calcium-dependent processes (6). Progestins, on ease, is the leading cause of death among women in the other hand, if included in the HRT, seem to have developed countries (1,2). The incidence increases some deleterious effects on plasma LDL and HDL concen- sharply after menopause, and 1 in 4 women dies of coro- trations, although they lower the triglyceride levels nary heart disease after the age of 60 (3). Menopause is increased by estrogens (2,8). In general, these effects are associated with increased cardiovascular risk factors such less pronounced with the progestins having less andro- as android obesity, hyperinsulinemia, disturbed glucose genic properties, such as 17-hydroxyprogesterone deriv- tolerance, increased insulin resistance, increased serum atives including medroxyprogesterone acetate and cypro- low-density lipoprotein (LDL), very low-density lipopro- terone acetate (8). tein (VLDL) and triglyceride levels, and hypertension It is obvious that the effects of HRT on cardiovascular (2,4,5). risk factors will be influenced by the type of estrogen or In postmenopausal women, hormone replacement progestin used as well as by the route of administration. therapy (HRT) reduces the incidence of coronary heart Our aim was to determine the effects of 4 different HRT disease by almost 50% (6,7). One of the mechanisms is protocols on several cardiovascular risk factors. The pro- that estrogens induce several changes in cholesterol tocols investigated in this study are oral conjugated metabolism, thus decreasing the LDL and increasing the equine estrogens (conj-E), transdermal 17-beta estradiol high-density lipoprotein (HDL) levels (2). Other possible (17βE2), cyclic oral estradiol 17-valerate combined with mechanisms by which estrogens favorably affect the car- cyproterone acetate (E2-17-valerate+CA), and oral diovascular system include improved insulin resistance tibolone which is a synthetic steroid with estrogenic, and carbohydrate metabolism, enhanced fibrinolysis androgenic, and progestogenic properties (9). 469 Effects of four Different Hormone Replacement Therapy Regimens on Certain Cardiovascular Risk Factors Materials and Methods were used in order to protect the endometrium, and the rd th This study included 89 postmenopausal patients who 3 protocol was chosen rather than the 4 if they want- regularly attended the outpatient clinic of Ondokuz MayÝs ed to have regular menses. The control examinations University - Obstetrics and Gynecology Department for a were performed at 3-month intervals and the ones who 1-year period, since January 1997. Sixty-nine of these did not attend these examinations were not included in had surgical menopause due to previous hysterectomy the study. The patients were also told not to change their and bilateral salpingo-oopherectomy performed for life-styles or eating habits and to try to maintain their benign disorders. The rest had natural menopause and body weights during the study period. were amenorrheic for at least 12 months with serum FSH All patients served as their own controls, and the sys- more than 30 IU/L and estradiol less than 20 pg/ml. None tolic and diastolic BP measurements, fasting blood glu- of the patients had previously used hormone preparations cose, serum total cholesterol, LDL, HDL and triglyceride or any other drug which may influence the plasma lipid levels at the 12th month of therapy were compared with profile. None of them had diabetes mellitus or any con- the pretreatment values. The paired-samples T test, traindication for hormone replacement therapy. Wilcoxon matched-pairs signed-ranks test, Kruskal-Wallis Before the treatment, all patients were evaluated with variance analysis and Mann-Whitney U test were used for general physical and pelvic examination as well as mam- the statistical analyses where appropriate. All data is mography, transvaginal ultrasonography and cervicovagi- expressed as the mean±standard error of the mean. The nal or cuff smears. Blood pressures (BP) were recorded results were considered significant if the p value was less in the sitting position with a standard mercury sphygmo- than 0.05. manometer after 10 minutes of rest. All patients under- went routine laboratory work-up including fasting blood Results glucose, serum total cholesterol, LDL, HDL and triglyc- eride levels which were measured by enzymatic calori- The ages of the 89 patients ranged between 35 and metric tests. 62 years. The mean ages were 42.2±2.2, 45.6±1.2, 46.3±1.4, and 43.1±1.7 years in groups I, II, III, and IV The 4 HRT protocols used in this study are listed in respectively. These figures were not significantly differ- Table 1. These protocols were not randomly chosen, but ent from each other (p > 0.05). decided on by both the doctor and his/her patient after the doctor had given the necessary information. In Pretreatment BP measurements ranged between 90 patients with natural menopause, the 3rd or 4th protocols and 180 mmHg systolic and 50 and 120 mmHg diastolic. Table 1. The HRT protocols used in the GROUPS HRT* Protocols n % study. G I Conjugated equine estrogens 32 35.9 (0.625 mg/d continuous protocol p.o**.) G II Transdermal 17-beta estradiol 22 24.7 (50 mg/d continuous protocol) st th G III E2 17-valerate (2 mg/d p.o. 1 -11 day) 19 21.4 th st E2 17-valerate (1 mg/d p.o. 12 -21 day) th st +cyproterone acetate (1 mg/d p.o. 12 -21 day) nd th No treatment between 22 -28 day (cyclic protocol) G IV Tibolone (2.5 mg/d continuous protocol p.o.) 16 18.0 TOTAL 89 100.0 * HRT: Hormone replacement therapy ** p.o: Per oral 470 E. MALATYALIOÚLU, A. K…K‚†, F. F. YANIK, T. ALPER These values tended to decrease in all the treatment A significant difference between the initial and posttreat- groups at the end of 12 months, ranging between again ment values was only present in the 4th group (tibolone 90 and 180 mmHg systolic and 50 and 110 mmHg dias- group). tolic. A significant difference between the initial and post- When the differences between the initial and post- treatment values, was only observed in the diastolic BP treatment levels of all those metabolic parameters were measurements of the group treated with E2-17-valer- evaluated, there was no significant difference between ate+CA (p<0.05) (Table 2). There was not any significant the treatment groups (p>0.05). difference among the 4 groups when the amounts of decrease in either systolic or diastolic BP measurements were evaluated (p>0.05). Discussion Fasting blood glucose at the end of the 1-year thera- Today, there are various types of postmenopausal py were similar to the pretreatment values in all groups hormone replacement therapy protocols and these are (Table 3). This was also true for the total cholesterol lev- increasing in number every day. As one of the primary els of groups I, III and IV. In the 2nd group (transdermal purposes of HRT is to decrease the morbidity and mor- 17βE2 group), mean total cholesterol levels decreased tality secondary to cardiovascular diseases, the effects of after the treatment but this decrease was not significant these therapeutic agents on the cardiovascular system (p>0.05) (Table 3). should be known. HRT decreased the serum LDL levels of the patients in The changes in lipid profile induced by estrogens, groups I, II and IV, but in the 3rd group (E2-17-valer- account for approximately 25-30% of the cardiovascular ate+CA group) LDL levels tended to increase. However, benefit of the HRT (2,10). LDL levels decrease and HDL these changes were not significant in any group (p>0.05) levels increase with estrogen treatment. However, a (Table 3). Furthermore, mean serum HDL levels were paradoxical increase in serum triglyceride levels due to higher in groups I, II and III at the end of the 1-year ther- increased VLDL production is also observed (1,11). The apy, and this increase was significant in the 1st and 3rd proposed mechanism for these changes in the lipid profile groups (conj-E and E2-17-valerate+CA groups respec- was the hepatic first-pass effect of oral estrogens (11).
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