The risk of venous thrombosis in women over 50 years old using oral contraception or postmenopausal hormone therapy

@article{Roach2013TheRO,
  title={The risk of venous thrombosis in women over 50 years old using oral contraception or postmenopausal hormone therapy},
  author={R E J Roach and Willem M Lijfering and Frans M. Helmerhorst and S. C. Cannegieter and Frits Richard Rosendaal and Astrid van Hylckama Vlieg},
  journal={Journal of Thrombosis and Haemostasis},
  year={2013},
  volume={11}
}
Roach REJ, Lijfering WM, Helmerhorst FM, Cannegieter SC, Rosendaal FR, van Hylckama Vlieg A. The risk of venous thrombosis in women over 50 years old using oral contraception or postmenopausal hormone therapy. J Thromb Haemost 2013; 11: 124–31. 

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...

References

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Oral estrogen therapy increases venous thromboembolism risk among postmenopausal women using hormone therapy and route of estrogen administration and concomitant progestogens type are 2 important determinants of thrombotic risk.

Hormone Therapy and Venous Thromboembolism Among Postmenopausal Women: Impact of the Route of Estrogen Administration and Progestogens: The ESTHER Study

Oral but not transdermal estrogen is associated with an increased VTE risk, and data suggest that norpregnane derivatives may be thrombogenic, whereas micronized progesterone and pregnane derivatives appear safe with respect toThrombotic risk.

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