Anesthesia will be maintained with 0.7 to 1.5 minimum alveolar concentration of sevoflurane and 0.5 µg kg-1 increments of fentanyl to maintain the SE values less than 50 and the difference between RE and SE less than 10. Suppression of the second twitch in train-of-four stimulation of the ulnar nerve will be maintained with 0.03mg kg-1 increments of cisatracurium.