Both groups maitained in anesthesia with sevoflurane, adjusted sevofluran concentration at the evaporation vase (0.5% increase or decrease every 2 minutes, every 2 minutes) to keep 40 ≤ SE ≤ 60, maintained epidural with a mixture of 0, 2% bupivacaine and fentanyl 2 mcg / ml at a dose of 6 ml / hour to keep SPI 30 - 50, if SPI>50, it added fentanyl 1 mcg / kg intravenously.