Analgesic Efficacy of Two Concentrations of Bupivacaine in Women in Labor

At the beginning of the work of effective labor maneuver randomly be allocated ( using sealed envelopes) and an outsider to the study prepared the dosage to bupivacaine 0.125% or 0.25% to be administered by epidural catheter for an anesthesiologist to disown the concentration employed. It is measured vital signs, and visual analogue scale dilatation in minutes 0,15,30,60 and 90 after being applied analgesia.