Effect of the administrated oxygen ratio during anesthesia on incidence of wound infection in clean-contaminated surgery

Despite different methods implemented, surgical wound infection is still an important cause of mortality and morbidity of patients which impose a considerable cost on health care system. According to recent data, administration of supplemental oxygen during operation can reduce the risk of wound infection due to increased tissue oxygenation and therefore better elimination of bacteria by oxidative killing. This study is done to investigate the effect of administered oxygen ratio on the incidence of wound infection in clean-contaminated surgery. This is a double blind clinical trial. 584 patients from both sexes between 18 to 60 years old, who were condidated for clean-contaminated surgery were divided into two equal groups randomly. One recived 80% and the other 40% FIO2 during anesthesia. The frequency of wound infection between the two groups was assessed during a two weeks period. Of patients receiving 80% FIO2, 11 (3.9%) patients, and the group recieving 40% FIO2, 25(8.1%) patients had wound infection (p<0.05). This study similar to previous studies showed the positive effect of supplemental oxygen in decreasing risk of surgical wound infection. Therefore according to the low risk and low cost and effectivness of this method in patients undergone surgery, it is recommended in clean-contaminated surgery.