Oral contraceptives and cardiovascular disease (first of two parts)

Beyond Birth Control: The Neuroscience of Hormonal Contraceptives

Hormonal contraceptives (HCs) are one of the most highly prescribed classes of drugs in the world used for both contraceptive and noncontraceptive purposes. Despite their prevalent use, the impact of HCs on the brain remains inadequately explored. This review synthesizes recent findings on the neuroscience of HCs, with a focus on human structural neuroimaging as well as translational, nonhuman animal studies investigating the cellular, molecular, and behavioral effects of HCs. Additionally, we consider data linking HCs to mood disorders and dysregulation of the hypothalamic-pituitary-adrenal (HPA) axis and stress response as a potential mediator. The review also addresses the unique sensitivity of the adolescent brain to HCs, noting significant changes in brain structure and function when HCs are used during this developmental period. Finally, we discuss potential effects of HCs in combination with smoking-derived nicotine on outcomes of ischemic brain damage. Methodological challenges, such as the variability in HC formulations and user-specific factors, are acknowledged, emphasizing the need for precise and individualized research approaches. Overall, this review underscores the necessity for continued interdisciplinary research to elucidate the neurobiological mechanisms of HCs, aiming to optimize their use and improve women's health.

The effect of hormonal contraceptive therapy on clinical laboratory parameters: a literature review

Hormonal contraceptives (HC) are widely used among women in reproductive ages. In this review, the effects of HCs on 91 routine chemistry tests, metabolic tests, and tests for liver function, hemostatic system, renal function, hormones, vitamins and minerals were evaluated. Test parameters were differently affected by the dosage, duration, composition of HCs and route of administration. Most studies concerned the effects of combined oral contraceptives (COC) on the metabolic, hemostatic and (sex) steroids test results. Although the majority of the effects were minor, a major increase was seen in angiotensinogen levels (90-375 %) and the concentrations of the binding proteins (SHBG [∼200 %], CBG [∼100 %], TBG [∼90 %], VDBP [∼30 %], and IGFBPs [∼40 %]). Also, there were significant changes in levels of their bound molecules (testosterone, T3, T4, cortisol, vitamin D, IGF1 and GH). Data about the effects of all kinds of HCs on all test results are limited and sometimes inconclusive due to the large variety in HC, administration routes and dosages. Still, it can be concluded that HC use in women mainly stimulates the liver production of binding proteins. All biochemical test results of women using HC should be assessed carefully and unexpected test results should be further evaluated for both methodological and pre-analytical reasons. As HCs change over time, future studies are needed to learn more about the effects of other types, routes and combinations of HCs on clinical chemistry tests.

Harms of third- and fourth-generation combined oral contraceptives in premenopausal women: A systematic review and meta-analysis

We assessed the available evidence regarding adverse effects on surrogate and patient-important health outcomes of third- and fourth-generation combined oral contraceptives among premenopausal women. We performed a systematic review and meta-analysis including randomized controlled trials and observational studies comparing third- and fourth-generation combined oral contraceptives with other generation contraceptives or placebo. Studies that enrolled women aged 15 to 50 years, with at least three cycles of intervention and 6 months of follow-up were included. A total of 33 studies comprising 629,783 women were included. Low-density lipoprotein cholesterol levels were significantly lower in fourth-generation oral contraceptives (mean differences (MD): -0.24 mmol/L; [95% CI -0.39 to -0.08]), while total cholesterol was significantly increased in levonorgestrel users when compared to third-generation oral contraceptives (MD: 0.27 mmol/L; [95% CI 0.04 to 0.50]). A decreased arterial thrombosis incidence was shown in fourth-generation oral contraceptive users, as compared to levonorgestrel (incidence rate ratio (IRR): 0.41; [95% CI 0.19 to 0.86]). No difference was found in the occurrence of deep venous thrombosis between fourth-generation oral contraceptives and levonorgestrel users (IRR: 0.91; [95% CI 0.66 to 1.27]; p = 0.60; I2 = 0%). Regarding the remaining outcomes, data were heterogeneous and showed no clear difference. In premenopausal women, the use of third- and fourth-generation oral contraceptives is associated with an improved lipid profile and lower risk of arterial thrombosis. Data were inconclusive regarding the rest of outcomes assessed. This review was registered in PROSPERO with CRD42020211133.

Low Thrombin Generation in Users of a Contraceptive Containing Estetrol and Drospirenone

OBJECTIVE

To compare the impact on thrombin generation of the new combined oral contraceptive containing 15 mg estetrol and 3 mg drospirenone with ethinylestradiol (30 or 20 mcg) associated either with 150 mcg levonorgestrel or with 3 mg drospirenone.

METHODS

Data were collected from the "E4/DRSP Endocrine Function, Metabolic Control and Hemostasis Study" (NCT02957630). Overall, the per-protocol set population included 24 subjects in the ethinylestradiol/levonorgestrel arm, 28 subjects in the ethinylestradiol/drospirenone arm, and 34 subjects in the estetrol/drospirenone arm. Thrombograms and thrombin generation parameters (lag time, peak, time to peak, endogenous thrombin potential, and mean velocity rate index) were extracted for each subject at baseline and after 6 cycles of treatment.

RESULTS

After 6 cycles of treatment, ethinylestradiol-containing products arms show a mean thrombogram outside the upper limit of the reference range, that is the 97.5th percentile of all baseline thrombograms. On the other hand, the mean thrombogram of estetrol/drospirenone is within this reference interval. After 6 cycles of treatment, all thrombin generation parameters are statistically less affected by estetrol/drospirenone than ethinylestradiol-containing products.

CONCLUSIONS

In conclusion, an association of 15 mg estetrol with 3 mg drospirenone does not have an impact on thrombin generation compared with ethinylestradiol-containing products that, either associated with levonorgestrel or drospirenone, are able to increase the production of procoagulant factors and decrease the production of anticoagulant ones, shifting the patient to a prothrombotic state. Ethinylestradiol-containing products thus generate prothrombotic environments contrary to estetrol which demonstrates a neutral profile on hemostasis.

Oral contraceptives and stroke: Foes or friends

Incidents of strokes are increased in young women relative to young men, suggesting that oral contraceptive (OC) use is one of the causes of stroke among young women. Long-term exposures to the varying combinations of estrogen and progestogen found in OCs affect blood clotting, lipid and lipoprotein metabolism, endothelial function, and de novo synthesis of neurosteroids, especially brain-derived 17β-estradiol. The latter is essential for neuroprotection, memory, sexual differentiation, synaptic transmission, and behavior. Deleterious effects of OCs may be exacerbated due to comorbidities like polycystic ovary syndrome, sickle cell anemia, COVID-19, exposures to endocrine disrupting chemicals, and conventional or electronic cigarette smoking. The goal of the current review is to revisit the available literature regarding the impact of OC use on stroke, to explain possible underlying mechanisms, and to identify gaps in our understanding to promote future research to reduce and cure stroke in OC users.

Laboratory Testing for the Evaluation of Phenotypic Activated Protein C Resistance

Activated protein C (APC) resistance (APCR) is considered a risk factor of venous thromboembolism (VTE). The most common genetic disorder conferring APCR is a factor (F) V Leiden mutation, but many other factors are also implicated, such as other F5 mutations (e.g., FV Hong-Kong and FV Cambridge), protein S deficiency, elevated factor VIII, exogenous hormone use, pregnancy and postpartum, depending on how APCR is defined. Considering the large population affected, the detection of this phenotype is crucial. Two types of tests are currently available: clotting time-based assays (with several versions) and thrombin generation-based assays with the endogenous thrombin potential (ETP)-based assay. The purpose of this review is therefore to discuss the performances of these tests and the cases in which it would be appropriate to use one over the other. Initially, as APCR was thought to be solely related to the FV Leiden mutation, the objective was to obtain a 100% specific assay. Clotting-time based assays were thus specifically designed to detect this inherited condition. Later on, an APCR condition without a FV Leiden mutation was identified and highlighted as an independent risk factor of VTE. Therefore, the development of a less specific assay was needed and a global coagulation test was proposed, known as the ETP-based APCR assay. In light of the above, these tests should not be used for the same purpose. Clotting time-based assays should only be recommended as a screening test for the detection of FV mutations prior to confirmation by genetic testing. On the other hand, the ETP-based APC resistance assay, in addition to being able to detect any type of APCR, could be proposed as a global screening test as it assesses the entire coagulation process.

Laboratory Testing for the Evaluation of Phenotypic Activated Protein C Resistance

Activated protein C (APC) resistance (APCR) is considered a risk factor of venous thromboembolism (VTE). The most common genetic disorder conferring APCR is a factor (F) V Leiden mutation, but many other factors are also implicated, such as other F5 mutations (e.g., FV Hong-Kong and FV Cambridge), protein S deficiency, elevated factor VIII, exogenous hormone use, pregnancy and postpartum, depending on how APCR is defined. Considering the large population affected, the detection of this phenotype is crucial. Two types of tests are currently available: clotting time-based assays (with several versions) and thrombin generation-based assays with the endogenous thrombin potential (ETP)-based assay. The purpose of this review is therefore to discuss the performances of these tests and the cases in which it would be appropriate to use one over the other. Initially, as APCR was thought to be solely related to the FV Leiden mutation, the objective was to obtain a 100% specific assay. Clotting-time based assays were thus specifically designed to detect this inherited condition. Later on, an APCR condition without a FV Leiden mutation was identified and highlighted as an independent risk factor of VTE. Therefore, the development of a less specific assay was needed and a global coagulation test was proposed, known as the ETP-based APCR assay. In light of the above, these tests should not be used for the same purpose. Clotting time-based assays should only be recommended as a screening test for the detection of FV mutations prior to confirmation by genetic testing. On the other hand, the ETP-based APC resistance assay, in addition to being able to detect any type of APCR, could be proposed as a global screening test as it assesses the entire coagulation process.

Laboratory Testing for the Evaluation of Phenotypic Activated Protein C Resistance

Activated protein C (APC) resistance (APCR) is considered a risk factor of venous thromboembolism (VTE). The most common genetic disorder conferring APCR is a factor (F) V Leiden mutation, but many other factors are also implicated, such as other F5 mutations (e.g., FV Hong-Kong and FV Cambridge), protein S deficiency, elevated factor VIII, exogenous hormone use, pregnancy and postpartum, depending on how APCR is defined. Considering the large population affected, the detection of this phenotype is crucial. Two types of tests are currently available: clotting time-based assays (with several versions) and thrombin generation-based assays with the endogenous thrombin potential (ETP)-based assay. The purpose of this review is therefore to discuss the performances of these tests and the cases in which it would be appropriate to use one over the other. Initially, as APCR was thought to be solely related to the FV Leiden mutation, the objective was to obtain a 100% specific assay. Clotting-time based assays were thus specifically designed to detect this inherited condition. Later on, an APCR condition without a FV Leiden mutation was identified and highlighted as an independent risk factor of VTE. Therefore, the development of a less specific assay was needed and a global coagulation test was proposed, known as the ETP-based APCR assay. In light of the above, these tests should not be used for the same purpose. Clotting time-based assays should only be recommended as a screening test for the detection of FV mutations prior to confirmation by genetic testing. On the other hand, the ETP-based APC resistance assay, in addition to being able to detect any type of APCR, could be proposed as a global screening test as it assesses the entire coagulation process.

Combined Oral Contraceptives and Venous Thromboembolism: Review and Perspective to Mitigate the Risk

Many factors must be considered and discussed with women when initiating a contraceptive method and the risk of venous thromboembolism (VTE) is one of them. In this review, we discuss the numerous strategies that have been implemented to reduce the thrombotic risk associated with combined oral contraceptives (COCs) from their arrival on the market until today. Evidences suggesting that COCs were associated with an increased risk of VTE appeared rapidly after their marketing. Identified as the main contributor of this risk, the dosage of the estrogen, i.e., ethinylestradiol (EE), was significantly reduced. New progestins were also synthetized (e.g., desogestrel or gestodene) but their weak androgenic activity did not permit to counterbalance the effect of EE as did the initial progestins such as levonorgestrel. Numerous studies assessed the impact of estroprogestative combinations on hemostasis and demonstrated that women under COC suffered from resistance towards activated protein C (APC). Subsequently, the European Medicines Agency updated its guidelines on clinical investigation of steroid contraceptives in which they recommended to assess this biological marker. In 2009, estradiol-containing COCs were marketed and the use of this natural form of estrogen was found to exert a weaker effect on the synthesis of hepatic proteins compared to EE. In this year 2021, a novel COC based on a native estrogen, i.e., estetrol, will be introduced on the market. Associated with drospirenone, this preparation demonstrated minor effects on coagulation proteins as compared with other drospirenone-containing COCs. At the present time, the standard of care when starting a contraception, consists of identifying the presence of hereditary thrombophilia solely on the basis of familial history of VTE. This strategy has however been reported as poorly predictive of hereditary thrombophilia. One rationale and affordable perspective which has already been considered in the past could be the implementation of a baseline screening of the prothrombotic state to provide health care professionals with objective data to support the prescription of the more appropriate contraceptive method. While this strategy was judged too expensive due to limited laboratory solutions, the endogenous thrombin potential-based APC resistance assay could now represent an interesting alternative.

Cardiovascular problems associated with IVF therapy

We are now in the beginning of the fifth decade of in vitro fertilization (IVF) with more than ten million children born and an annual growth rate of half a million. It was recently found that there is a sevenfold increase in the incidence of pulmonary embolism (PE) during the first trimester of an IVF pregnancy as compared to spontaneous pregnancy. PE is a major cause of maternal mortality, and it is thus of outmost importance to understand the pathophysiological mechanism. The oestrogen surge during the ovarian stimulation has been hypothesized to be the initiating pathophysiological event. A support of this is a current report showing that embryo transfer performed directly after ovarian stimulation increased the risk of PE more than eightfold, whereas no such increase was noted after delayed embryo transfer. This increased risk coincides with a persisting increased oestrogen level. Further reported cardiovascular problems are arterial thromboses, pre-eclampsia and gestational hypertension. Global haemostasis tests change in the direction of increased coagulability, but mostly within normal limits. Cell-bound haemostasis and in particular platelet activation are less studied. However, a major increase in the number of microvesicles (MVs) and markers indicating platelet activation was reported during ovarian stimulation. We now need longitudinal data concerning haemostatic variables that extends into the first trimester. A major research focus should be to identify biomarkers that could be used already before instigation of IVF. Another way to avoid risk could be to delay embryo transfer by adapting a freeze-all strategy.

Big Data and Radiology Research

Our understanding of human health may be significantly enhanced in the near future because of the unprecedented volume of digitized health care data and the availability of artificial intelligence to mine these data for correlations that could drive new research hypotheses and improved patient care. Observational studies and randomized trials are traditional methods to generate and test hypotheses. Another way to generate research hypotheses is to use big data to reveal patterns and associations for further study. In 2018, the National Institutes of Health unveiled its Strategic Plan for Data Science, which includes a far-reaching plan for the use of big data to stimulate new research discoveries. Both researchers and physicians will need to learn and apply new skills in understanding the use of artificial intelligence and other tools, as well as in the direct application of data collection and mining in their own practices and patients.

Analysis of Cardiovascular Disease Risk Factors in Women

AIM:

Study the cardiovascular risk factors in a feminine population vulnerable to cardiovascular events particularly to evaluate the principal factors or possible confounding variables.

METHODS:

This is a cross-sectional descriptive study. Were analysed all the female patients from the Cardiovascular Rehabilitation Institute of Sports Medicine of Caxias do Sul who had the complete information on cardiovascular disease history, comorbidities and habits and who knew the complete gynaecological history by a phone interview.

RESULTS:

A group of 91 patients were analysed. About the comorbidities and habits, 45.2% of these patients presented some tobacco load, 82.4% are hypertensive, 61.5% are dyslipidemic, 25.3% are diabetic and the BMI average was 29.27 (overweight). Between the patients who undergone a hysterectomy and had an episode of the acute coronary syndrome (10 patients), 70% had the event after the procedure. Between the post-menopause women with at least one episode of the acute coronary syndrome, 80.5% (33 patients) had the first event after the menopause.

CONCLUSION:

We found multiple lifetime risk factors that predisposed the women of the sample to have cardiovascular disease. Between the women with specific to women risk factors and without, the prevalence of cardiovascular disease was very similar. This information supports the idea that these are just confounding factors of CVD and the principals involved are the genetic factors and habits. For this reason, the focus of CVD prevention and treatment should be directed towards these aspects.

Oral contraceptives and menopausal hormone therapy: relative and attributable risks of cardiovascular disease, cancer, and other health outcomes

PURPOSE

To summarize the relative risks (RRs) and attributable risks (ARs) of major health outcomes associated with use of combined oral contraceptives (OCs) and menopausal hormone therapy (HT).

METHODS

For OCs, measures of association are from meta-analyses of observational studies. For HT, these measures are from the Women's Health Initiative, a large randomized trial of HT for chronic disease prevention in postmenopausal women aged 50 to 79 years.

RESULTS

Current OC use increases risks of venous thromboembolism and ischemic stroke. However, women of reproductive age are at low baseline risk, so the ARs are small. OC use also increases risk of breast and liver cancer and reduces risk of ovarian, endometrial, and colorectal cancer; the net effect is a modest reduction in total cancer. The Women's Health Initiative results show that HT does not prevent coronary events or overall chronic disease in postmenopausal women as a whole. Subgroup analyses suggest that timing of HT initiation influences the relation between such therapy and coronary risk, and its overall risk-benefit balance, with more favorable effects (on a relative scale) in younger or recently menopausal women than in older women or those further past the menopausal transition. However, even if the RR do not vary by these characteristics, the low absolute baseline risks of younger or recently menopausal women translate into low ARs in this group.

CONCLUSIONS

OC and HT can safely be used for contraception and treatment of vasomotor symptoms, respectively, by healthy women at low baseline risk for cardiovascular disease and breast cancer.

Oral contraceptives and menopausal hormone therapy: relative and attributable risks of cardiovascular disease, cancer, and other health outcomes

PURPOSE

To summarize the relative risks (RRs) and attributable risks (ARs) of major health outcomes associated with use of combined oral contraceptives (OCs) and menopausal hormone therapy (HT).

METHODS

For OCs, measures of association are from meta-analyses of observational studies. For HT, these measures are from the Women's Health Initiative, a large randomized trial of HT for chronic disease prevention in postmenopausal women aged 50 to 79 years.

RESULTS

Current OC use increases risks of venous thromboembolism and ischemic stroke. However, women of reproductive age are at low baseline risk, so the ARs are small. OC use also increases risk of breast and liver cancer and reduces risk of ovarian, endometrial, and colorectal cancer; the net effect is a modest reduction in total cancer. The Women's Health Initiative results show that HT does not prevent coronary events or overall chronic disease in postmenopausal women as a whole. Subgroup analyses suggest that timing of HT initiation influences the relation between such therapy and coronary risk, and its overall risk-benefit balance, with more favorable effects (on a relative scale) in younger or recently menopausal women than in older women or those further past the menopausal transition. However, even if the RR do not vary by these characteristics, the low absolute baseline risks of younger or recently menopausal women translate into low ARs in this group.

CONCLUSIONS

OC and HT can safely be used for contraception and treatment of vasomotor symptoms, respectively, by healthy women at low baseline risk for cardiovascular disease and breast cancer.

Cross-sex hormonal replacement: is this really effective? an experimental clue

Castrated rats of either sex were used in this work, and sex hormones of their own gender or cross-sex hormones were administered for 4 months. Animals were then put through 5 min of myocardial ischemia followed by a 5-min reperfusion injury. Electrocardiographic recordings were made and serum was obtained. Sex hormone levels were measured. Cardiac frequency was calculated, arterial pressure was determined, and the levels of lactate dehydrogenase (LDH), creatinine kinase (CK), and thiobarbituric acid reactive species (TBARs) were analyzed. Proinflammatory cytokine levels were measured in homogenized hearts; besides this, five hearts of each experimental group were obtained and fixed for histopathologic analysis. In male rats with estradiol replacement, the incidence of tachyarrhythmias and CK levels were higher when compared to the rest of the animals. Their cytokine levels were also elevated when compared to the group that received testosterone. Estradiol replacement protected female rats from variations in all of the parameters evaluated, whereas testosterone did not show a protective effect. In the presence of testosterone, the incidence of tachyarrhythmia was higher and TBARs, cytokines, CK, and LDH levels were also elevated. The results shown reinforce the idea that cross-sex hormone administration can damage the cardiovascular system.

Is lipid profile determination necessary in women wishing to use oral contraceptives?

INTRODUCTION

Although coronary heart disease in users of combined oral contraceptives (COCs) is rare, one of the principal risk factors for its occurrence is dyslipidemia.

OBJECTIVE

To evaluate the prevalence of dyslipidemia in women wishing to use COCs, and its association with known clinical risk factors in order to evaluate the need to determine the lipid profile in this population.

STUDY DESIGN

Cross-sectional study involving 516 women aged 18-40 years, 54% nulligravid, who wished to use COCs and presented no contraindications. Dyslipidemia was classified according to the National Cholesterol Educational Project Adult Treatment Panel III guidelines, which define levels of total cholesterol ≥ 200 mg/dL, high-density lipoprotein cholesterol <40 mg/dL, triglycerides >150 mg/dL, and low-density lipoprotein cholesterol ≥ 160 mg/dL as an abnormal lipid profile. The lipid profile was determined, and the association between clinical risk factors and the presence of dyslipidemia was evaluated by the chi-squared test and logistic regression. The receiver operating characteristic curve was constructed to compare body mass index (BMI) and smoking relevance for dyslipidemia.

RESULTS

The prevalence of dyslipidemia was 33.9%. Smoking and BMI were significantly associated with the presence of dyslipidemia, with sensitivity of 31.3-54% and specificity of 41.9-67.7% for diagnosis of dyslipidemia, respectively.

CONCLUSION

The high prevalence of dyslipidemia could justify lipid profile evaluation before prescribing a COC. BMI and smoking represent modest predictive markers for the presence of dyslipidemia in candidates for the use of combined oral contraceptives.

Reciprocal coordination of a combination oral contraceptive containing desogestrel+ethinyl estradiol on the expression of LOX-1 and LDLR in placental trophoblast cells

BACKGROUND

The aim of this study was to assess the consistency of antiatherosclerotic potential of a combination oral contraceptive steroid (ethinyl estradiol+desogestrel) by rating its effect on the differential expression of the low-density lipoprotein receptor (LDLR) and lectin-like oxidized LDL (LOX-1) receptor.

STUDY DESIGN

Cells from placental trophoblast cell line (JAR) and differentiated primary placental trophoblast cells isolated from term human placentae were used for this study. Expressions of LOX-1 and LDLR were assessed by immunoblot and immunocytochemistry assays. Differential effects of the constituent steroids in the combination of ethinyl estradiol and desogestrel were verified on the expression profile of the receptors.

RESULTS

Desogestrel opposed the effect of ethinyl estradiol on LOX-1 expression, and when used in combination, the combination oral contraceptive reduced the expression of LOX-1 in contrast to LDLR. The characteristic change in the expressions of LOX-1 and LDLR showed an antiatherosclerotic improvisation at the unique combination of ethinyl estradiol (10 ng/mL) and desogestrel (20 ng/mL).

CONCLUSION

The aforesaid combination of ethinyl estradiol and desogestrel keeps LOX-1 and LDLR reciprocally expressed in antiatherosclerotic mode.

Rotation thromboelastography (ROTEM) parameters are influenced by age, gender, and oral contraception

Rotation thromboelastography (ROTEM) is a screening method that allows the rapid detection of plasma- and platelet-related haemostatic abnormalities. To use this procedure more efficiently, reference values depending on gender, age, and oral contraception are required. In this study, five cohorts of healthy subjects were examined by ROTEM upon activation of the extrinsic or intrinsic pathway of coagulation, or recalcification alone. The cohorts comprised male subjects below (1) and above (2) 45 years of age, female subjects below 45 years of age with (3) or without (4) oral contraception, and female subjects above 45 years (5) without hormone replacement therapy. A significant influence of gender, age, and oral contraception on parameters determined by ROTEM was observed. Thus, adjustment for age, gender, and oral contraception is required when ROTEM is used to screen for distinct abnormalities of haemostasis.

Contracepção hormonal: uma comparação entre pacientes das redes pública e privada de saúde

O objetivo deste artigo é avaliar o perfil de pacientes usuárias de contraceptivos hormonais no setor público e fazer a comparação com o serviço privado de saúde, bem como verificar a frequência de efeitos colaterais e a aderência ao tratamento. Realizou-se um estudo de corte transversal com 240 pacientes, sendo 120 da rede privada e 120 da rede pública de saúde. No grupo privado, a dosagem hormonal mais frequentemente prescrita foi a de 15 ou 20 microgramas de etinil-estradiol (EE), associados a gestodeno, desogestrel ou levonogestrel (36,7%). No grupo público, a combinação de 30 microgramas de EE associados a gestodeno, levonogestrel ou desogestrel (48,3%) foi a principal medicação contraceptiva prescrita. Não houve diferença entre a frequência dos efeitos colaterais nos dois grupos pesquisados (p>0,05). A aderência ao tratamento foi maior nas pacientes do grupo privado (p<0,05). Concluiu-se que o método contraceptivo mais utilizado foi o oral com baixa dosagem de EE, não havendo diferença entre a frequência dos efeitos colaterais. A aderência ao tratamento foi maior no grupo privado, o que pode estar associado ao fator sociocultural das pacientes estudadas.

Effect of a combination oral contraceptive (desogestrel+ethinyl estradiol) on the expression of low-density lipoprotein receptor and its transcription factor (SREBP2) in placental trophoblast cells

BACKGROUND

This in vitro study deals with the effect of a combination oral contraceptive steroid - desogestrel and ethinyl estradiol - on the expression of low-density lipoprotein receptor (LDLR) and its transcription factor (SREBP2) in assessing the functional effectiveness of the LDLR.

STUDY DESIGN

Differentiated primary placental trophoblast cells isolated from term human placentae and cells from Jar cell line were used for the study. Low-density lipoprotein receptor and SREBP2 expressions were assessed by immunocytochemistry and immunoblot assays with and without combination contraceptive steroid challenge. Functional activity of LDLR was studied by rating the profile of cellular uptake of fluorescent Dil-LDL (1,1'-dioctadecyl-3,3,3',3'-tetramethylindocarbocyanin perchlorate-LDL). Quantitation of Dil-LDL was done spectrofluorometrically.

RESULTS

Variation of concentration(s) of either of the components of a combination preparation (desogestrel and ethinyl estradiol) showed a comparable change in the expressions of LDLR and SREBP2 to attain their optimal levels. Maximum expression and a significant functional effectiveness were observed at a unique combination of desogestrel (20 ng/mL) and ethinyl estradiol (10 ng/mL).

CONCLUSION

The stimulatory effect of a combination contraceptive steroid on LDLR expression is an associated phenomenon of the contraceptive-mediated stimulation of SREBP2 expression.

Advantages and challenges of oestrogen-free hormonal contraception

BACKGROUND

Not all women tolerate hormonal contraceptives containing oestrogens.

METHODS

The authors selected and evaluated relevant publications on the advantages and challenges of oestrogen-containing and oestrogen-free oral contraceptives obtained from the MEDLINE and Google databases from January 2000 to January 2010. In addition, the reference lists from the obtained publications as well as the authors' clinical experience served as additional sources of information. Emphasis was placed on the common adverse effects and risks associated with oestrogen replacement as well as on the noncontraceptive benefits of combined oral contraceptive pills and progestogen-only pills in the management of menstrual cycle-dependent problems.

FINDINGS

Progestogen-only pills have the potential to abolish many of the common adverse effects associated with oestrogen plus progestogen oral contraceptives and can be used to treat various menstrual cycle-dependent problems. However, only a limited number of clinical comparative studies are available. Progestogen-only pills are associated with a more irregular bleeding pattern than contraceptive pills containing oestrogens, especially during the first few months of therapy. As this is not permanent, adequate counselling is essential in order to prevent unnecessary discontinuation of treatment.

CONCLUSIONS

Progestogen-only pills offer an effective, convenient, and readily reversible method of contraception that is suitable for women with contraindications for oestrogens.

Long-term oral contraceptive treatment, metabolic syndrome and measures of cardiovascular risk in pre-menopausal women: National Health and Nutrition Examination Survey 1999-2004

AIM

Differences in subclinical cardiometabolic measures were examined as a function of oral contraceptive pills (OCP) treatment duration to compare never-treated women with four OCP-treatment groups (<1, 1-5, 5-10 and >10 years).

METHODS

The NHANES (1999-2004) database was used to evaluate 2089 healthy, pre-menopausal women, aged 18-55 years, with or without OCP history, no other hormonal treatment or history of systemic conditions. Outcome measures included body mass, central obesity, blood pressure, glycemia, insulinemia, lipid profile and inflammation. Analyses evaluated differences in prevalence of Metabolic Syndrome (MetS), constituent MetS and other clinical risk criteria, as well as outcome magnitudes. Analyses controlled for demographic and health-related variables, and study-eligible conditions.

RESULTS

Relative to other groups, women with >10 years OCP-use, and to some extent those with 5-10 years treatment, displayed no differences in prevalence of MetS and most risk criteria. Further analysis showed that, relative to women treated for <5 years, those with more prolonged OCP treatment displayed lower body mass and fasting glycemia with higher HDL-c levels, but more elevated LDL-c and total cholesterol.

CONCLUSIONS

The findings of both beneficial and detrimental subclinical cardiometabolic differences with more long-term OCP-treatment reinforces the need to monitor changes in these factors within the context of the treated patient's risk-benefit profile. However, because the magnitude of these differences was small, relative to normative ranges, it may be concluded that OCPs, as used in recent decades, are unlikely to markedly affect cardiometabolic risk.

Monitoring the randomized trials of the Women's Health Initiative: the experience of the Data and Safety Monitoring Board

Data Safety Monitoring Committees (DSMB) for large, long-term randomized trials of agents in common use face challenging problems especially when the emerging data indicate unanticipated effects. The DSMB for the Women's Health Initiative Clinical Trials, on observing early indication of a surprising adverse cardiovascular effect of post-menopausal hormones, spent several years deliberating what recommendations it should make. This paper describes the dilemmas faced by the DSMB and the considerations it made over the course of its existence. The paper concludes with some recommendations for other DSMBs.

Study of low-density lipoprotein receptor regulation by oral (steroid) contraceptives: desogestrel, levonorgestrel and ethinyl estradiol in JEG-3 cell line and placental tissue

BACKGROUND

The aim of this study was to compare in vitro the role of two oral contraceptives, desogestrel (a less androgenic derivative of levonorgestrel) and levonorgestrel--alone and in combination with ethinyl estradiol--on low-density lipoprotein (LDL) receptor regulation by assessing receptor protein expression and functional effectiveness.

STUDY DESIGN

Placental tissue and cultured placental cells (JEG-3) were used to study the expression and endocytotic activity of LDL receptor protein. The expression of the receptor was assessed by immunocytochemistry and immunoblot assays with and without contraceptive challenge. Functioning activity of LDL receptor was studied by measuring the rate of uptake of LDL by placental cells. Quantification of LDL was based on the total cholesterol content of the lipoprotein.

RESULTS

A combination of desogestrel (20 ng/mL of incubation medium) and ethinyl estradiol (10 ng/mL of incubation medium) maintained the LDL receptor at high level of expression and functioning mode. In contrast, the double-blind preparation of levonorgestrel (20 ng/mL) and ethinyl estradiol (10 ng/mL) had shown much lower expression as well as receptor-mediated LDL uptake. The concentration of contraceptives used in this study was similar to the prevailing concentration of oral contraceptives in clinical use.

CONCLUSION

Higher expression of LDL receptor and enhanced rate of LDL uptake by the receptor protein projects the possibility that there might be less atherosclerosis-related disorders from the combination of desogestrol and ethinyl estradiol.

Pharmacokinetic Drug Interactions Involving 17??-Ethinylestradiol

17alpha-Ethinylestradiol (EE) is widely used as the estrogenic component of oral contraceptives (OC). In vitro and in vivo metabolism studies indicate that EE is extensively metabolised, primarily via intestinal sulfation and hepatic oxidation, glucuronidation and sulfation. Cytochrome P450 (CYP)3A4-mediated EE 2-hydroxylation is the major pathway of oxidative metabolism of EE. For some time it has been known that inducers of drug-metabolising enzymes (such as the CYP3A4 inducer rifampicin [rifampin]) can lead to breakthrough bleeding and contraceptive failure. Conversely, inhibitors of drug-metabolising enzymes can give rise to elevated EE plasma concentrations and increased risks of vascular disease and hypertension. In vitro studies have also shown that EE inhibits a number of human CYP enzymes, such as CYP2C19, CYP3A4 and CYP2B6. Consequently, there are numerous reports in the literature describing EE-containing OC formulations as perpetrators of pharmacokinetic drug interactions. Because EE may participate in multiple pharmacokinetic drug interactions as either a victim or perpetrator, pharmaceutical companies routinely conduct clinical drug interaction studies with EE-containing OCs when evaluating new chemical entities in development. It is therefore critical to understand the mechanisms underlying these drug interactions. Such an understanding can enable the interpretation of clinical data and lead to a greater appreciation of the profile of the drug by physicians, clinicians and regulators. This article summarises what is known of the drug-metabolising enzymes and transporters governing the metabolism, disposition and excretion of EE. An effort is made to relate this information to known clinical drug-drug interactions. The inhibition and induction of drug-metabolising enzymes by EE is also reviewed.

The effect of oestrogen on megakaryocyte differentiation and platelet counts in vivo

BACKGROUND

Oestrogen alters megakaryocyte number in humans and mice. In mice, high-dose oestrogen stimulates an initial increase in megakaryocyte number followed by a decrease. However, the cellular action, effect of physiologically circulating and smaller supra-physiological oestrogen doses and whether changes in megakaryocyte number alter platelet counts have not been studied.

METHODS

To further examine oestrogen's effect on megakaryocytes and platelets we administered intact or ovariectomised mice various doses of oestrogen and measured megakaryocyte and platelet counts. To determine the cellular mechanism by which oestrogen influences megakaryocytopoesis we also examined its effect on markers of megakaryocytic differentiation (CD41, CD61, CD34).

RESULTS

We found that large doses of oestrogen (500 microg/kg) increased mature CD41+ megakaryocyte number within 2 days, and this was associated with an increase in circulating platelets. Smaller supra-physiological doses (100 microg/kg) lacked this anabolic effect, but still suppressed megakaryocyte and platelet number by day 10 in intact and ovariectomised mice. This was preceded by a reduction in the number of CD61+ megakaryoblasts and CD34+ precursors available to form mature megakaryocytes. In contrast, ovariectomy had no effect on megakaryocyte or platelet number, indicating that circulating oestrogen concentrations do not influence megakaryocyte differentiation or activity.

CONCLUSIONS

Our data suggest that in mice at least platelet counts reflect changes in megakaryocyte number, and while both are independent of physiological hormone concentrations, they are sensitive to even small supra-physiological doses of oestrogen. Therefore, to ovoid disrupting platelet homeostasis the dose of oestrogen given should be no more than replacement.

Effect of urinary versus recombinant follicle-stimulating hormone on platelet function and other hemostatic variables in controlled ovarian hyperstimulation

OBJECTIVE

To determine the effect of urinary versus recombinant FSH on platelet function and hemostatic variables in women undergoing controlled ovarian hyperstimulation cycles.

DESIGN

Randomized clinical study.

SETTING

Major university-based infertility and in vitro fertilization unit and hemostasis laboratory.

PATIENT(S)

Ten healthy women (in vitro study), and 24 women undergoing routine controlled ovarian hyperstimulation cycles (in vivo study), randomly assigned to receive either urinary (u-FSH) or recombinant gonadotropin (r-FSH).

INTERVENTION(S)

In vitro study: effect of preincubation of plasma with u-FSH or r-FSH, in the presence or absence of estradiol, on platelet function and coagulation parameters. In vivo study: Changes in platelet function and coagulation parameters after treatment with u-FSH or r-FSH during controlled ovarian hyperstimulation cycles.

MAIN OUTCOME MEASURE(S)

Platelet aggregation and ATP release, activated protein C resistance ratio, free protein S.

RESULT(S)

In vitro study: Platelet aggregation and ATP release were significantly inhibited by u-FSH relative to r-FSH in both the presence and absence of estradiol (P=.047). In vivo study: Platelet function was significantly inhibited after treatment with u-FSH (P=.05) but not with r-FSH. In both studies, small changes of minor clinical significance were noted in activated protein C resistance and free protein S levels.

CONCLUSION(S)

The different platelet response to u-FSH and r-FSH may have clinical implications in selected patients, especially those at risk of thromboembolic complications, in decisions regarding the appropriate medication for controlled ovarian hyperstimulation cycles.

Hormone replacement therapy and cardiovascular disease: increased risks of venous thromboembolism and stroke, and no protection from coronary heart disease

Hormone replacement therapy (HRT) was increasingly promoted over the last 40 years to improve quality of life, and to reduce the risks of osteoporotic fractures and coronary heart disease (CHD). In recent years, observational studies, randomized trials and systematic reviews of such trials have shown that HRT does not reduce, but actually increases cardiovascular risk. HRT increases the relative risks of venous thromboembolism (twofold), and of fatal or disabling stroke (by 50%); whilst increasing the early risk of myocardial infarction and having no protective effect against CHD on longer term use. Possible mechanisms for these increased cardiovascular risks include down-regulation of several inhibitory pathways of blood coagulation, resulting in increased coagulation activation, which promotes venous and arterial thrombosis. The implications for prescription are discussed, as are lessons for future evaluation of health care interventions.

Postmenopausal HRT is not independent risk factor for dural sinus thrombosis

While a dural sinus thrombosis (DST), is a well-known consequence of the use of oral contraceptives, the role of hormone replacement therapy (HRT) in DST was not previously evaluated. We report two postmenopausal women, presenting with DST under HRT. Antiphospholipid antibodies in one case and borderline protein S deficiency in another were diagnosed. Only five cases of DST under HRT were previously reported and in two of them additional prothrombotic risk factors were found. According to these and previous cases, HRT is not an independent risk factor for DST.

Venous thrombosis and changes of hemostatic variables during cross-sex hormone treatment in transsexual people

The incidence of venous thrombosis associated with estrogen treatment in male-to-female (M-->F) transsexuals is considerably higher with administration of oral ethinyl estradiol (EE) than with transdermal (td) 17-beta-estradiol (E(2)). To find an explanation for the different thrombotic risks of oral EE and td E(2) use, we compared the effects of treatment of M-->F transsexuals with cyproterone acetate (CPA) only, and with CPA in combination with td E(2), oral EE, or oral E(2) on a number of hemostatic variables [activated protein C (APC) resistance and plasma levels of protein S, protein C, and prothombin], all of which are documented risk factors for venous thrombosis. APC resistance was determined by quantification of the effect of APC on the amount of thrombin generated during tissue factor-initiated coagulation; plasma levels of total and free protein S were determined by standard ELISA; and levels of prothrombin and protein C were determined with functional assays after complete activation of the zymogens with specific snake venom proteases. CPA-only, td-E(2)+CPA, or oral-E(2)+CPA treatment produced rather small effects on hemostatic variables, whereas oral EE treatment resulted in a large increase in APC resistance from 1.2 +/- 0.8 to 4.1 +/- 1 (P < 0.001), a moderate increase in plasma protein C (9%; P = 0.012), and a large decrease in both total and free plasma protein S (30%; P < 0.005). The large differential effect of oral EE and oral E(2) indicates that the prothrombotic effect of EE is due to its molecular structure rather than to a first-pass liver effect (which they share). Moreover, these differences may explain why M-->F transsexuals treated with oral EE are exposed to a higher thrombotic risk than transsexuals treated with td E(2). Testosterone administration to female-to-male transsexuals had an antithrombotic effect.

Effect of second- and third-generation oral contraceptives on the protein C system in the absence or presence of the factor VLeiden mutation: a randomized trial

A plausible mechanism to explain thrombotic risk differences associated with the use of second- and third-generation oral contraceptives (OCs), particularly in carriers of factor V(Leiden), is still lacking. In a double-blind trial, 51 women without and 35 women with factor V(Leiden) were randomized to either a second- (30 microg ethinylestradiol/150 microg levonorgestrel) or third- (30 microg ethinylestradiol/150 microg desogestrel) generation OC. After 2 cycles of use and a wash-out of 2 cycles, the participants continued with the corresponding progestagen-only preparation. Hemostatic variables that probe the activity of the anticoagulant protein C system were determined. Compared with levonorgestrel, desogestrel-containing OCs significantly decreased protein S and increased activated protein C (APC) resistance in both groups. OCs with desogestrel had the most pronounced effects in carriers of factor V(Leiden). Progestagen-only preparations caused changes of anticoagulant parameters opposite to those of combined OCs, which in a number of cases were more pronounced with levonorgestrel. Our data show that progestagens in combined OCs counteract the thrombotic effect of the estrogen component. The higher thrombotic risk associated with third-generation OCs compared with second-generation OCs may be explained by the fact that desogestrel appeared less antithrombotic than levonorgestrel, especially in women with factor V(Leiden).

Estrogens, progestogens and thrombosis

Hundreds of millions of women worldwide use either oral contraceptives or postmenopausal hormone replacement. The use of oral contraceptives leads to an increased risk of venous thrombosis, of myocardial infarction, of stroke and of peripheral artery disease, the risks of which are highest during the first year of use. Women with coagulation abnormalities have a higher risk of venous thrombosis when they use oral contraceptives (or postmenopausal hormones) than women without these abnormalities. The risk of venous thrombosis is also higher for preparations containing desogestrel or gestodene (third-generation progestogens) than for those containing levonorgestrel (second-generation progestogens). A previous thrombosis as well as obesity also increase the risk of oral contraceptive-related thrombosis. Hormone replacement therapy increases the risk of venous thrombosis, and has no beneficial, and possibly even a detrimental, effect on the risk of arterial disease. The risk of arterial disease in oral contraceptive users and users of hormone replacement therapy is at most weakly affected by the presence of prothrombotic abnormalities.

The RATIO study: oral contraceptives and the risk of peripheral arterial disease in young women

With regard to oral contraceptives, much research has concentrated on venous thrombosis and on the coronary and cerebral forms of atherosclerotic disease, while peripheral arterial disease (PAD) has received little attention. In this case-control study, we assessed oral contraceptive use and the risk of PAD in young women using a population-based case-control study. The women were 18-49 years of age, and had been admitted to a collaborating hospital between January 1990 and October 1995, and had a diagnosis of PAD. Participants were patients with PAD (n = 152), and control women (n = 925), identified by random digit dialing. The diagnosis of PAD was based almost exclusively on intra-arterial angiography. Patients and control subjects filled out the same structured questionnaire, which included questions on medical history, cardiovascular risk factors, and contraceptive use. The adjusted odds ratio for PAD in women using any type of oral contraceptives vs. no use, was 3.8 (95% CI 2.4-5.8). When first generation oral contraceptive use was compared with no use, the odds ratio was 8.7 (95% CI 3.6-21.3). For second and third generation oral contraceptives, the adjusted odds ratios (compared with non-users) were 2.6 (95% CI 1.4-4.9) and 3.0 (95% CI 1.4-6.6), respectively. This is the first study on oral contraceptive use and PAD in humans. All types of oral contraceptives were associated with an increased risk of PAD.

Does female gender or hormone replacement therapy affect early or late outcome after carotid endarterectomy?

OBJECTIVE

Subgroup analyses of the Asymptomatic Carotid Atherosclerosis Study and the North American Symptomatic Carotid Endarterectomy Trial trials have questioned the ability of carotid endarterectomy (CEA) to reduce the risk of stroke in women. The purpose of this study was to test the effect of female gender and estrogen-based hormone replacement therapy on perioperative (30-day) and long-term (5-year) outcomes after CEA.

METHODS

From 1988 to 1998, 361 CEAs were performed in 326 patients (246 male, 115 female) by a single surgeon. Retrospective data were collected with chart review, and follow-up data were obtained with clinical examination or telephone interview. Follow-up was possible in 95% of patients. Reoperative CEAs and combined aortic or cardiac procedures were excluded. Statistical analysis used life-table methods, Student t test, and Pearson chi(2) tests when appropriate.

RESULTS

Age and preoperative risk factors were similar between women and men. CEA was performed for symptomatic (50% female, 42% male) and asymptomatic carotid stenosis (50% female, 58% male; P =.19). Perioperative (30-day) stroke rate was similar for women and men (3.6% female, 1.2% male; P =.13). No perioperative strokes occurred in asymptomatic patients. With previous stroke or transient ischemic attack, a trend was seen towards an increased perioperative stroke rate in women (7.0% female, 2.8% male; P =.25). Long-term follow-up showed a similar trend in the 5-year stroke rate in symptomatic patients (7.0% female, 2.8 male; P =.23). The stroke-free survival rate was not significantly different between genders (87% female, 75% male; P =.58). Reoperation was performed for asymptomatic recurrent carotid stenosis in five men (2.3%) and two women (1.9%; P =.84). Interestingly, the use of estrogen-based hormone replacement therapy in women showed a trend toward increasing stroke rate at 30 days (1.2% versus 8.7%; P =.08) and at 5 years (2.3% versus 8.7%; P =.16).

CONCLUSION

This retrospective study confirms that CEA provides long-term reduction in stroke risk and improved stroke-free survival rates in both men and women. However, women with previous neurologic symptoms and those using hormone replacement therapy appear to be at higher stroke risk at the time of surgery.