[Arterial hypertension and pregnancy].

Hypertension is observed in 10 to 15% of pregnancies, but only 10% of affected women will suffer preeclampsia. The pathophysiology of preeclampsia is based on an early anomaly of placental implantation, leading to a cascade of events (secretion of vasopressive prostaglandins, anomalies of hemostatis) which can cause disseminated intravascular coagulation. The diagnosis of preeclampsia is based on hypertension and significant proteinuria (above 0.5 g/24 h), and paraclinical maternal and fetal examinations to follow the evolution and detect the appearance of maternal complications (retroplacental haematoma, Hellp syndrome and eclampsia) and (or) fetal complications (delayed growth, in utero fetal death, perinatal death). The aim of hypertensive treatment is to normalise blood pressure and to avoid maternal complications. Preventive treatment with aspirin reduces the frequency of recurrent preeclampsia and delayed growth of the fetus.