title: Perioperative supplemental oxygen therapy and surgical site infection: a meta-analysis of randomized controlled trials.
abstract: OBJECTIVE
  To conduct a meta-analysis of randomized controlled trials in which high inspired oxygen concentrations were compared with standard concentrations to assess the effect on the development of surgical site infections (SSIs).
  
  
  METHODS
  A systematic literature search was conducted using the MEDLINE, EMBASE, and Cochrane databases and included a manual search of references of original articles, poster presentations, and abstracts from major meetings ("gray" literature).
  
  
  METHODS
  Twenty-one of 2167 articles met the inclusion criteria. Of these, 5 randomized controlled trials (3001 patients) assessed the effect of perioperative supplemental oxygen use on the SSI rate. Studies used a treatment-inspired oxygen concentration of 80%. Maximum follow-up was 30 days.
  
  
  METHODS
  Data were abstracted by 3 independent reviewers using a standardized data collection form. Relative risks were reported using a fixed-effects model. Results were subjected to publication bias testing and sensitivity analyses.
  
  
  RESULTS
  Infection rates were 12.0% in the control group and 9.0% in the hyperoxic group, with relative risk reduction of 25.3% (95% confidence interval [CI], 8.1%-40.1%) and absolute risk reduction of 3.0% (1.1%-5.3%). The overall risk ratio was 0.742 (95% CI, 0.599-0.919; P = .006). The benefit from increasing oxygen concentration was greater in colorectal-specific procedures, with a risk ratio of 0.556 (95% CI, 0.383-0.808; P = .002).
  
  
  CONCLUSIONS
  Perioperative supplemental oxygen therapy exerts a significant beneficial effect in the prevention of SSIs. We recommend its use along with maintenance of normothermia, meticulous glycemic control, and preservation of intravascular volume perioperatively in the prevention of SSIs.
authors.affiliation: Department of Surgery, Price Institute of Surgical Research, University of Louisville School of Medicine, Louisville, Kentucky 40202, USA. m0qada01@louisville.edu
authors.forename: Motaz
authors.initials: M
authors.lastname: Qadan
authors.forename: Ozan
authors.initials: O
authors.lastname: Akça
authors.forename: Suhal S
authors.initials: SS
authors.lastname: Mahid
authors.forename: Carlton A
authors.initials: CA
authors.lastname: Hornung
authors.forename: Hiram C
authors.initials: HC
authors.lastname: Polk
mesh_terms: D006801:Humans; D010100:Oxygen / Q000097:blood; D010102:Oxygen Inhalation Therapy; D016032:Randomized Controlled Trials as Topic; D013530:Surgical Wound Infection / Q000517:prevention & control*
chemical_list: D010100:Oxygen