Introduction: Perioperative hypothermia can lead to various complications. Although various warming techniques have been used to prevent perioperative hypothermia, the effect of these techniques on surgical site infection (SSI) during posterior fusion surgery is unclear. The effects of warming devices on SSI rates were therefore analyzed using data complied by the Health Insurance and Review Assessment (HIRA) Service in Korea.
Methods: This study included 5406 patients in the HIRA Service database who underwent posterior fusion surgery during the years 2014,2015, and 2017. Factors related to SSI in these patients, including warming devices, antibiotics, and transfusion, were analyzed.
Results: The incidence of SSI was higher in patients who underwent forced air warming than in those who did not undergo active warming [odds ratio(OR), 1.73; p=0.039], especially above 70 years old (OR, 4.11; p=0.014). By contrast, the incidence of SSI was not significantly higher in patients who underwent device using conduction. Infection rates were higher in patients who received prophylactic antibiotics within 20 minutes before incision, than within 21 to 60 minutes (OR, 2.07; p=0.001) and who received more blood transfusions (1pint < volume < 2pint; OR, 1.75; p=0.049, >2pint; OR, 2.73; p=0.004).
Discussion: SSI rates were higher in patients who underwent warming with forced air devices than with devices using conduction, as well as being higher in patients who older age, received more blood transfusions and administered antibiotics within 20 minutes before incision. Devices using conduction have more advantages in preventing SSI than forced air warming device. In addition, the reduction of other risk factors for SSI may improve postoperative results.