Background
Despite numerous trials assessing optimal antibiotic prophylaxis strategies for colorectal surgery, few studies have assessed real-world practice on a national scale with respect to risk of surgical site infections.
Objective
Using a large, national claims database we aimed to describe 1) current use of prophylactic antibiotics (type and duration) and 2) associations with surgical site infection after open colectomies.
Design
Retrospective study using the Premier Perspective database.
Setting
Patient hospitalizations nationwide from January 2006 to December 2013.
Patients
90,725 patients that underwent an open colectomy in 445 different hospitals.
Main Outcome Measures
Multilevel multivariable logistic regressions measured associations between surgical site infection and 1) type of antibiotic used and 2) duration (day of surgery only, day of surgery and the day after, >1 day after surgery).
Results
Overall surgical site infection prevalence was 5.2% (n=4,750). Most patients (41.8%) received cefoxitin for prophylaxis; other choices were ertapenem (18.2%), cefotetan (10.3%), metronidazole+cefazolin (9.9%), ampicillin+sulbactam (7.6%), while 12.2% received other antibiotics. Distribution of prophylaxis duration was: 51.6%, 28.5%, and 19.9% for days 0, 0+1, and 1+, respectively. Compared to cefoxitin, lower odds for surgical site infection were observed for ampicillin+sulbactam (odds ratio 0.71; 95% confidence interval 0.63–0.82), ertapenem (odds ratio 0.65; 95% confidence interval 0.58–0.71) and metronidazole+cefazolin (odds ratio 0.56; 95% confidence interval 0.49–0.64), and “other” (odds ratio 0.81; 95% confidence interval 0.73–0.90); duration was not significantly associated with altered odds for surgical site infection. Sensitivity analyses supported the main findings.
Limitations
Lack of detailed clinical information in the billing dataset used.
Conclusions
In this national study assessing real-world use of prophylactic antibiotics in open colectomies, type of antibiotic used appeared to be associated with up to 44% decreased odds for surgical site infections. While there are numerous trials on optimal prophylactic strategies, studies that particularly focus on factors that influence the choice of prophylactic antibiotic might provide insights into ways of reducing the burden of surgical site infections in colorectal surgeries.