title: Surgical site infection and the routine use of perioperative hyperoxia in a general surgical population: a randomized controlled trial.
abstract: BACKGROUND
  Surgical site infection (SSI) in the general surgical population is a significant public health issue. The use of a high fractional inspired concentration of oxygen (FIO2) during the perioperative period has been reported to be of benefit in selected patients, but its role as a routine intervention has not been investigated.
  
  
  OBJECTIVE
  To determine whether the routine use of high FIO2 during the perioperative period alters the incidence of SSI in a general surgical population.
  
  
  METHODS
  Double-blind, randomized controlled trial conducted between September 2001 and May 2003 at a large university hospital in metropolitan New York City of 165 patients undergoing major intra-abdominal surgical procedures under general anesthesia.
  
  
  METHODS
  Patients were randomly assigned to receive either 80% oxygen (FIO2 of 0.80) or 35% oxygen (FIO2 of 0.35) during surgery and for the first 2 hours after surgery.
  
  
  METHODS
  Presence of clinically significant SSI in the first 14 days after surgery, as determined by clinical assessment, a management change, and at least 3 prospectively defined objective criteria.
  
  
  RESULTS
  The study groups were closely matched in a large number of clinical variables. The overall incidence of SSI was 18.1%. In an intention-to-treat analysis, the incidence of infection was significantly higher in the group receiving FIO2 of 0.80 than in the group with FIO2 of 0.35 (25.0% vs 11.3%; P =.02). FIO2 remained a significant predictor of SSI (P =.03) in multivariate regression analysis. Patients who developed SSI had a significantly longer length of hospitalization after surgery (mean [SD], 13.3 [9.9] vs 6.0 [4.2] days; P<.001).
  
  
  CONCLUSIONS
  The routine use of high perioperative FIO2 in a general surgical population does not reduce the overall incidence of SSI and may have predominantly deleterious effects. General surgical patients should continue to receive oxygen with cardiorespiratory physiology as the principal determinant.
authors.affiliation: Department of Anesthesiology, Weill Medical College of Cornell University, New York, NY 10021, USA. kopryor@yahoo.com
authors.forename: Kane O
authors.initials: KO
authors.lastname: Pryor
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Fahey
authors.forename: Cynthia A
authors.initials: CA
authors.lastname: Lien
authors.forename: Peter A
authors.initials: PA
authors.lastname: Goldstein
mesh_terms: D000768:Anesthesia, General; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D018496:Hyperoxia / Q000503:physiopathology*; D007432:Intraoperative Period; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic; D018384:Oxidative Stress / Q000502:physiology*; D010100:Oxygen / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use*; D011184:Postoperative Period; D012306:Risk; D013514:Surgical Procedures, Operative; D013530:Surgical Wound Infection / Q000453:epidemiology* / Q000517:prevention & control
chemical_list: D010100:Oxygen