title: Postoperative delirium in spine surgery.
abstract: BACKGROUND
  Postoperative delirium is a great concern in the treatment of hip fracture. However, there have been no reports regarding the postoperative delirium in spine surgery.
  
  
  OBJECTIVE
  To determine the incidence and risk factors for postoperative delirium in the patients who have had spine surgery.
  
  
  METHODS
  The incidence and intraoperative risk factors of postoperative delirium were retrospectively examined in patients who had spine surgery during a 3-year period.
  
  
  METHODS
  Three hundred forty-one patients who underwent spine surgery from 2000 to 2002 were included.
  
  
  METHODS
  The presence of delirium was determened by the Confusion Assessment Method. Laboratory data were checked preoperatively, at 1 day and 1 week postoperatively. The prognosis of postoperative delirium was evaluated.
  
  
  RESULTS
  Postoperative delirium was found in 13 patients; all of them were in their 70's or 80's. The incidence of delirium was 12.5% in the patients over 70 years old. Hemoglobin and hematocrit levels at 1 day after surgery in the delirium group were significantly lower than those in the control group. One patient had persistent cognitive dysfunction after surgery. Two patients who developed postoperative delirium died during the follow-up period.
  
  
  CONCLUSIONS
  Low concentrations of hemoglobin and hematocrit 1 day after surgery were risk factors for postoperative delirium. As delirium is thought to represent not only brain dysfunction, but also impaired general physical condition, careful observation is necessary for the management of patients with postoperative delirium.
authors.affiliation: Department of Orthopaedic Surgery, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan. zenji@ms.toyama.mpu.ac.jp
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Kawaguchi
authors.forename: Masahiko
authors.initials: M
authors.lastname: Kanamori
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Ishihara
authors.forename: Yumiko
authors.initials: Y
authors.lastname: Abe
authors.forename: Masanori
authors.initials: M
authors.lastname: Nobukiyo
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Sigeta
authors.forename: Takeshi
authors.initials: T
authors.lastname: Hori
authors.forename: Tomoatsu
authors.initials: T
authors.lastname: Kimura
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000740:Anemia / Q000175:diagnosis; D003221:Confusion / Q000175:diagnosis; D003693:Delirium / Q000175:diagnosis / Q000453:epidemiology / Q000209:etiology*; D005260:Female; D006400:Hematocrit; D006801:Humans; D007564:Japan / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications; D015985:Precipitating Factors; D012307:Risk Factors; D013131:Spine / Q000601:surgery*