Which wound management approach represents the greatest risk for infection complications arising from surgery on a dirty wound?

• A. Immediate primary closure of the wound
• B. Delayed closure
• C. Debridement and immediate closure
• D. Prophylactic antibiotics prior to surgery

Answer: (A)

Closing a dirty wound immediately after surgery traps bacteria and necrotic debris inside, blocks drainage, and creates an environment where infection can quickly take hold. When contamination is present, the wound needs time to drain and be cleaned, with nonviable tissue removed, so that infection risk is reduced. Delayed closure or healing by secondary intention allows ongoing drainage and better control of bacterial load, which lowers the chance of infection. Debridement helps remove dead tissue and contaminants, but if closure happens right away in the setting of dirty contamination, the bacteria are still sealed in. Prophylactic antibiotics can help lower risk, but they can’t fully compensate for closing a wound that remains contaminated. For these reasons, the approach that closes the wound immediately after dirty contamination carries the greatest infection risk.