title: The ketamine enigma.
authors.forename: J
authors.initials: J
authors.lastname: Persson
mesh_terms: D016058:Analgesia, Patient-Controlled / Q000379:methods; D000700:Analgesics / Q000627:therapeutic use; D000701:Analgesics, Opioid / Q000627:therapeutic use; D004359:Drug Therapy, Combination; D006801:Humans; D007649:Ketamine / Q000627:therapeutic use; D009020:Morphine / Q000627:therapeutic use; D010149:Postoperative Pain / Q000517:prevention & control
chemical_list: D000700:Analgesics; D000701:Analgesics, Opioid; D007649:Ketamine; D009020:Morphine