Hypercapnia derives increase of cerebral blood flow and cardiac output. It means that the rate of propofol elimination from the brain and the blood will be increased and the patient will awake more quickly. There has been no study about the effects of hypercapnia. The investigators will evaluate hypercapnia's effects on the recovery time from propofol anesthesia.
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Time to open eyes under investigator's command
Timeframe: From cessation of propofol infusion to patient's eye opening (seconds)