Objectives: To determine peridural bupivacaine analgesia for labor pain relief and its effect on maternal and fetal hemodynamics. Design: Prospective, longitudinal, descriptive study. Setting: Obstetrical Center, Maternal and Perinatal Specialized Institute, Lima, Peru, a teaching hospital. Patients: Sixty patients in active phase of labor. Interventions: Twelve mL of 0,25% bupivacaine was given to the women in labor through epidural catheter. Visual analog scale was used to evaluate pain during labor. Maternal and fetal hemodynamic changes were described before and following epidural analgesia. Supplementary dosis of 6 mL 0,25% bupivacaine was used. Cardiotocographic tracings were registered and maternal and fetal complications were determined. Main outcome measures: Labor pain relief, maternal hemodynamics, fetal pH. Results: There was statistically significant pain relief using 12 mL ...