Prophylactic antimicrobials in elective colorectal and biliary surgery.

Area of Science:

• Surgical Infectious Diseases
• Clinical Pharmacology
• Microbiology

Background:

• Sepsis remains a significant complication following elective surgery.
• Appropriate peri-operative antibiotic prophylaxis is crucial for preventing surgical site infections and sepsis.
• Comparing different antibiotic regimens is essential for optimizing patient outcomes.

Purpose of the Study:

• To compare the efficacy of cefoxitin versus a metronidazole, penicillin, and tobramycin (MPT) regimen for peri-operative prophylaxis in patients undergoing biliary or colorectal surgery.
• To assess the incidence of sepsis and surgical site infections in relation to the prophylactic antibiotic used and surgical procedure type.

Main Methods:

• A randomized trial involving 97 patients undergoing elective biliary or colorectal surgery.
• Patients received either cefoxitin or a combination of metronidazole, penicillin, and tobramycin (MPT) for peri-operative prophylaxis.
• Sepsis incidence, wound culture results, and subsequent infection rates were monitored.

Main Results:

• Sepsis occurred in 6.8% of biliary surgery patients and 30.2% of colorectal surgery patients.
• In colorectal surgery, sepsis rates were comparable between cefoxitin (22.2%) and MPT (38.5%) groups (P = 0.20).
• Positive wound cultures post-operation were more frequent after colorectal surgery (30.2%) than biliary surgery (4.6%) and correlated with higher infection rates (P = 0.02).

Conclusions:

• Both cefoxitin and the MPT regimen appear to be similarly effective in preventing sepsis in colorectal surgery patients.
• The high sepsis rate in colorectal surgery warrants careful consideration of prophylaxis strategies.
• Positive intraoperative wound cultures are a significant predictor of post-operative infections, emphasizing the importance of sterile surgical techniques.