Premedication and ketamine.
D000293:Adolescent; D000328:Adult; D000368:Aged; D000768:Anesthesia, General; D001544:Benperidol; D002648:Child; D004325:Dreams; D005260:Female; D006212:Hallucinations; D006801:Humans; D007649:Ketamine; D008297:Male; D008875:Middle Aged; D009567:Nitrazepam; D011229:Preanesthetic Medication; D013997:Time Factors
D007649:Ketamine; D001544:Benperidol; D009567:Nitrazepam