The pathophysiological changes in patients with pre-eclampsia can lead to intrauterine growth restriction with chronic fetal distress, due to the limited uteroplacental flow, which, in certain situations, may be reduced by 50% to 70%. Added to this, spinal anesthesia may cause sudden hypotension and fetal acidosis more often, even in elective operations, compared to epidural or general anesthesia, and that these changes may not have clinical significance in healthy fetuses at term, but may be critical in situations where arterial insufficiency uteroplacental and fetal distress already to present. It is believed, therefore, important that treat or prevent hypotension in patients with severe preeclampsia under spinal anesthesia.