[Oxidative stress level and placental histological changes during preeclampsia].

Background: Oxidative stress has been related to several conditions during pregnancy (preeclampsia, abortions and premature rupture of membranes); it causes higher sensitivity of the endothelial blood vessel constriction and aggravates the endothelium dependent vasodilatación.

Objective: To determine the oxidative stress level and histological changes in preeclamptic women's placenta.

Patients And Method: Longitudinal and comparative study.