The patient is evaluated according to the Aldrete score (11) 5 minutes after the extubation ane every 5 minutes after until an Aldrete score of 9-10 is obtrained. The patient that reaches a score of 9-10 (capacity to move their extremities spontaneously and under command, to breath and cough, have a mean blood pressure between 20% of the preoperative level, to arouse themselves and the capacity to maintain an SpO2 greater than 90%) can begin to undergo cognitive testing.