Antibiotic prophylaxis in gastric, biliary and colonic surgery

Area of Science:

• Surgical Infection Prevention
• Clinical Microbiology
• Pharmacology

Background:

• Antibiotic prophylaxis is crucial in surgeries with high infection risk or severe consequences.
• Optimizing antibiotic timing is essential for effective surgical site infection (SSI) prevention.

Purpose of the Study:

• To evaluate the efficacy of different antibiotic administration timings for surgical prophylaxis.
• To determine the impact of antibiotic timing on SSI rates in specific gastrointestinal and biliary surgeries.

Main Methods:

• Prospective, randomized, double-blind study involving 400 patients undergoing elective gastric, biliary, and colonic surgery.
• Four antibiotic administration groups: 12 hours preoperatively, immediately preoperatively, postoperatively, and no antibiotic.
• Intraoperative tissue and fluid sampling for antibiotic concentration; aerobic and anaerobic cultures of surgical sites and postoperative infections.

Main Results:

• Preoperative antibiotic administration significantly reduced wound infection rates: stomach (22% to 4%), biliary tract (11% to 2%), and large bowel (16% to 6%).
• Postoperative antibiotic initiation yielded infection rates similar to no antibiotic use (15% vs. 16%).
• Effectiveness against peritoneal sepsis was less pronounced compared to wound infections.

Conclusions:

• Preoperative antibiotic prophylaxis is highly effective in reducing surgical wound infections for gastrointestinal and biliary procedures.
• Antibiotic administration timing is critical, with preoperative dosing demonstrating superior efficacy over postoperative dosing.