[Hormonal treatments and venous thrombosis in women].

Venous thromboembolism is frequently associated with hormonal factors in women. A thorough medical history taking of vascular risks and an individual evaluation of the risk-benefit ratio should precede any prescription of hormonal therapies. In contrary to progestin-only-pills, estroprogestative contraceptives increase 3-6 times the risk of venous thrombosis. In assisted reproductive techniques, venous thrombosis is frequently associated with the occurrence of a severe ovarian hyperstimulation syndrome. Antagonist ovarian stimulation protocols lower the risk of hyperstimulation and should therefore be preferred. Finally, at menopause, hormonal treatments combining transdermal estradiol and micronized progesterone do not seem to increment the risk of thrombosis.