Hormonal contraception and thrombosis
Open accessAbstract
The safety of combined hormonal contraceptives (CHCs) has been documented by years of follow-up, and the occurrence of venous thromboembolism (VTE) possibly related to their use is rare in the young population exposed to these agents. The balance between the benefits and risks of contraceptive steroids is generally positive, in particular when compared with pregnancy's risks. Epidemiological studies led to different results showing either no difference in VTE risk between CHCs (active surveillance prospective studies) or an increase in risk (observational or database studies). The discrepancy may be explained by different study designs and the fact that important risk factors such as overweight, family history of thrombosis, and smoking were not adjusted for in some observational studies. To improve the safety of CHC, modifying the estrogen dose and type, selecting newer progestins, and alternative routes of delivery were implemented. Ethinyl- E 2 (EE) exerts a stronger effect than E 2 on estrogen-dependent markers such as liver proteins and coagulation factors. To circumvent the metabolic changes induced by EE, more natural compounds such as E 2 and E 2 valerate (E 2 V) were developed, as well as new progestins structurally closer to P. Progestins when given alone do not increase VTE risk, and their risks and benefits depend upon their chemical structure, the type and dose of combined estrogen, and the delivery route. The lower impact of E 2-based CHCs on metabolic markers may result in an improved safety profile. A recent study on clinical outcomes supports this hypothesis. In conclusion, CHCs remain a safe and effective choice to prevent unwanted pregnancy, and the risk of VTE is in general low. Careful consideration of individual risk factors should be given before prescribing to avoid cumulative risks and minimize the occurrence of unwanted events.
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The oral dose of ethinylestradiol is directly proportional to the risk of venous thrombosis.
“its oral dose is directly proportional to the risk of venous thrombosis”
From Ethinylestradiol in combined hormonal contraceptive has a broader effect on serum proteome compared with estradiol valerate: a randomized controlled trial (2023) · cites this paper as Sitruk-Ware, 2016
New data suggest that the effects on coagulation and the risk for thromboembolism might be lower with natural estrogen combinations.
“Interestingly, new data suggest that the effects on coagulation and the risk for thromboembolism might be lower with natural estrogen combinations (Sitruk-Ware, 2016; Kluft et al., 2017; Heikinheimo et al., 2022; Haverinen et al., 2022b)”
From Ethinylestradiol in combined hormonal contraceptive has a broader effect on serum proteome compared with estradiol valerate: a randomized controlled trial (2023) · cites this paper as Sitruk-Ware, 2016
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- Authors
- Sitruk-Ware, R.
- Affiliations
- Population Council (US)
- Corresponding author
- Sitruk-Ware, Regine
- ORCID
- Sitruk-Ware, Regine
- Venue
- Fertility and Sterility
- Publisher
- Elsevier BV
- Published
- 2016-11
- Volume
- 106
- Issue
- 6
- Pages
- 1289-1294
- ISSN
- 0015-0282 (ISSN-L)
- OpenAlex
- W2521336064
- Cited by
- 79
- References
- 51
- Citations by year
- 2026: 2 · 2025: 5 · 2024: 8 · 2023: 11 · 2022: 9 · 2021: 13 · 2020: 11 · 2019: 8 · 2018: 7 · 2017: 4 · 2016: 1
- FWCI
- 1.00
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Fertility and Sterility (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Reproductive Health and Contraception
- Health Sciences › Medicine › Internal Medicine › Venous Thromboembolism Diagnosis and Management
- Health Sciences › Medicine › Hematology › Blood Coagulation and Thrombosis Mechanisms
- Keywords
- combined hormonal contraceptives, venous thromboembolism, thrombosis risk, estrogen dose, progestins, route of administration, risk factors, contraceptive safety
- MeSH terms
- Blood Coagulation, Contraception, Contraceptives, Oral, Combined, Contraceptives, Oral, Hormonal, Family Planning Services, Female, Humans, Pregnancy, Pulmonary Embolism, Risk Factors, Treatment Outcome, Risk Assessment, Venous Thrombosis, Venous Thromboembolism
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