 Will be evaluated: intensity of pain on a numerical scale from 0 to 10 every 30 minutes, relaxation of the sphincter muscles, intensity of pain after the operation every 30 minutes until reached the criteria for discharge, motor blocked of the lower limbs every 30 minutes, BP, HR, SO2, FR, other items that determine the conditions of discharge urine output, nausea and vomiting, time to hospital discharge, and duration of analgesia. 