The aim of this study is to evaluate one of the newest volatile anesthetics, desflurane which is characterized by low blood solubility, high vapor pressure, ultrashort duration of action and moderate potency. The Tec 6 desflurane vaporizer is electrically heated, thermostatically control, constant temperature and pressurized. Desflurane has several advantages including rapid induction and recovery, hemodynamic stability and safety for hepatic and renal systems.