Objective: To compare the side effects on labor of patient controlled epidural analgesia (PCEA) with ropivacaine at concentrations of 0.075%; 0.1% and 0.125% combined with fentanyl PCEA, divided into three groups, using ropivacaine concentration of 0.075%; 0.1% and 0.125% combined with fentanyl 2mcg / ml.