After nerve blocks finished, a standardized balanced anesthetic technique was provided in both groups. Anesthesia was administered with etomidate (0.1-0.2mg.kg-1) and rocuronium (0.4-0.6 mg.kg-1), and then suitable laryngeal mask airway (LMA) was facilitated with a respiratory rate of 10-12 bpm, an I:E ratio of 1:2 and an FiO2 of 0.6. Tidal volume will be adjusted to an end tidal CO2 of 35-40 mmHg. Maintaining with remifentanil (0.05-0.30 µg.kg-1.min-1), target concentrations of propofol (0.3-2.0 µg.mL-1) and sevoflurane (0.4 MAC). Infusion rates of propofol and remifentanil varied according to clinical judgment and bispectral index (BIS) range between 40 and 60. All procedures were performed by two veteran anesthesiologists.