[Effect of the monophase oral contraceptive combination with 20 ug ethinyl estradiol/150 ug desogestrel on haemostasis].

The authors examined the changes in the haemostasis during the use of the oral contraceptive combination with 20 microg ethynil estradiol/150 microg desogestrel at 35 women, a basic group, who used the oral contraceptive in the duration of 12 months and a control group (n=35), who do not use the pills. We found statistically significant increase of Antithrombin III (ATIII) (p<0.011), Cofactor II of Heparin (HCII) (p<0.001), the activity of plasminogen (p<0.026) and beta2-antiplasmin (0.026), significant decrease of Protein C (PrC) (p<0.0001) and of total Protein S (TPrS) (p<0.03) in the basic group in comparision with the control one. We do not observe significant changes in the rest of the haemostatic variables between the two groups. During the use of the oral contraceptive combination with 20 microg ethynil estradiol/150 microg desogestrel the changes in the system of the natural inhibitors are balanced by these in the system of fibrinolysis.