After the induction of anesthesia, carried out using routine clinical practice determined by the anesthesiologist the patient will be assigned to either the control group or the comparison group (the assignment will have been made prior to induction). The control group will receive either propofol or sevoflurance (with or without N2O at the discretion of the anesthesiologist based on clinical needs). The comparison group will be given desflurane (end tidal 5.0 - 6.0%) for maintenance of anesthesia (with or without N2O at the discretion of the anesthesiologist based on clinical needs). According to a randomized sequence patients will be assigned in a consecutive manor to the maintenance with the control technique or with desflurane.