Regional anesthesia techniques are currently the most used for cesarean section. Spinal anesthesia is associated with higher incidence and more pronounced decreases in blood pressure compared with epidural anesthesia, and this is due to the earlier establishment of sympathetic blockade. Hypotension is the most frequent complication of spinal anesthesia in the pregnant woman and can be potentially dangerous for both the mother and the fetus, among these factors the most relevant are: Complete amniotic bag, which in term pregnancy can contain approximately more than 1,000 ml, which increases the compression exerted by the uterus on the vena cava and reduces in greater quantity the already deteriorated venous return, which favors arterial hypotension. The small stature in spite of the fact that the dose and the speed of administration of the local anesthetic in pregnant women is reduced wit...