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Neuroleptanalgesic anesthesia
Neuroleptanalgesic anesthesia from Greek, neurolepsis - seizure and analgos - without pain.

First neuroleptanalgesia is produced by a combination of an opioid analgesic such as fentanyl and a neuroleptic like droperidol or haloperidol. After administering nitrous oxide with oxygen neuroleptanalgesia can be converted to neuroleptanesthesia.