title: Epidural morphine alone is inadequate for postthoracotomy pain relief.
authors.forename: S K
authors.initials: SK
authors.lastname: Chua
mesh_terms: D015360:Analgesia, Epidural; D000701:Analgesics, Opioid / Q000627:therapeutic use*; D006801:Humans; D009020:Morphine / Q000008:administration & dosage / Q000627:therapeutic use*; D010149:Postoperative Pain / Q000188:drug therapy*; D013908:Thoracotomy; D014147:Tramadol / Q000627:therapeutic use*
chemical_list: D000701:Analgesics, Opioid; D014147:Tramadol; D009020:Morphine