[Prophylactic treatment of preeclampsia]. 
The pathophysiology of preeclampsia is still unknown.  Low-dose aspirin showed a reduction of the preeclampsia rate in a high-risk situation. There is a lack of prospective randomized studies to prove the benefit of heparin treatment in patients with hereditary thrombophilia.  Different prophylactic therapies did not show any benefit in the prevention of preeclampsia in clinical studies.