A series of clinical observations of venous thrombosis in women taking combined oral contraceptives
DOI:
https://doi.org/10.15574/HW.2025.5(180).95100Keywords:
venous thromboembolism, combined oral contraception, factor V Leiden, hypercoagulation, activated partial thromboplastin time, risk of thrombosisAbstract
Aim - to analyze the issue of comprehensive assessment of the risk of venous thromboembolism (VTE) when prescribing combined hormonal contraceptives (CHCs), to determine the significance of genetic, clinical and laboratory risk factors, including thrombophilias and other indicators of hemostasis, and to justify approaches to individual decision-making regarding the safe use of CHCs.
The article analyzes the issues of comprehensive assessment of the risk of VTE when prescribing CHCs. It is justified that the patient's clinical characteristics - efficacy and tolerability - are not sufficient; the risk of VTE should be taken into account, in particular, taking into account genetic factors such as factor V Leiden mutation, anticoagulant deficiencies: antithrombin, protein C and S; other laboratory indicators of hemostasis. It has been shown that the presence of a heterozygous Leiden mutation increases the risk of VTE by 30 times, and homozygous - up to 100 times when taking combined hormonal contraception. In cases with existing “severe” thrombophilia (antithrombin, protein C and S deficiency), try to avoid the use of combined oral contraceptives with ethinylestradiol. At the same time, the absence of hereditary thrombophilia does not eliminate the risk of thrombosis, namely situational factors, such as increased levels of clotting factors, a shortened activated partial thromboplastin time due to being overweight, smoking, varicose veins of the lower extremities, or prolonged immobilization increases the likelihood of VTE. The author emphasizes that the decision to use hormonal contraception should be based on a comprehensive individual assessment of thrombotic risk, taking into account genetic, clinical and laboratory factors and suggests evaluating the activated partial thromboplastin time as a simple, accessible, and fairly informative screening test before prescribing contraceptives.
The study was conducted in accordance with the principles of the Declaration of Helsinki. The informed consent was obtained from all participants.
The author declares no conflict of interest.
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