[Estrogens and cardiovascular diseases: should current guidelines be changed?].

Survey about oral contraceptives and postmenopausal hormonal replacement therapy and the effects on coagulation system. The question to withdraw oral contraceptives 4 weeks before a gynecological operation cannot be answered sufficiently. The pros and cons have been discussed. Thromboembolic disorders in the history of a patient are contraindications for oral contraceptives. It can be anticipated, that this rule will be changed in future. There are no scientific hints, which could bring a phlebitis or varicosis in connection etiologically with a thromboembolic disorder during oral contraceptives.