Pre-oxygenation was performed for 2 min, induction in anesthesia - with propofol 2mg/kg IV and succinyl choline 1,5mg/kg IV. After intubation anesthesia was maintained with sevoflurane and atracurium bromide. The patients were ventilated with circle system with goal CO2 35-45 mm Hg. BIS-monitor target was between 40 and 60. Anesthetics and drug infusion were stopped with the end of surgery.