COMPARISON ANALGESIA EFFECT IN EPIDURAL ANESTHESIA OF ROPIVACAINE 0, 125% WITH BUPIVACAINE 0, 125% DURING THE LABOR The study conducted on 110 women in labor with epidural anesthesia in Hanoi Obstetric and Gynecology hospital and were randomized into two groups: RF group used 0.125% ropivacaine and BF group used 0.125% bupivacaine, both groups are combined with fentanyl 2.5 mcg / ml.