A non-inferiority study comparing efficacy of preoperative prophylactic antibiotics for preventing infectious complications in patients with less severe burns.

While international burn injury guidelines discourage prophylactic antibiotics on admission, current surgery guidelines focusing on antimicrobial prophylaxis place thermal injury under a general plastics procedure umbrella, and require significant evidential extrapolation. The purpose of this study was to determine if withholding systemic antibiotics in patients with <20% total body surface area (TBSA) burns without invasive wound infections and undergo wound excision is non-inferior to patients that receive preoperative antibiotics. Success was defined as lack of graft loss, bacteremia, or surgical site infection. One-thousand and eighty-three patients were screened and 100 patients undergoing 133 operations remained after exclusions. Seventy-four percent were male. Median age and %TBSA was 41 years (30, 55) and 5 (1.5, 8.3), respectively. We found no differences in demographics between patients that did and did not receive preoperative antibiotics. The success rates were 81.7% and 84.3%, respectively. There was one clinically significant bacteremia in each group. Withholding preoperative antibiotics was non-inferior with a percent difference of 2.6 (95% CI; -10.4, 15.6). Patients that did not receive antibiotics were no more likely to incur infection-related complications. In patients with <20% TBSA burns and without active wound infections, withholding preoperative systemic antibiotics will preserve unneeded antimicrobial exposure without increasing risk of infection-related complications.