In a patient with intestinal obstruction undergoing laparotomy with bowel resection and anastomosis, no peritonitis but intraoperative spillage of intestinal contents, what is the wound classification?

Wound Classification: Contaminated (Class III)

In a patient undergoing laparotomy with bowel resection and anastomosis for intestinal obstruction where intraoperative spillage of intestinal contents occurs but no peritonitis is present, the wound should be classified as contaminated.

Rationale for Classification

The key determinant here is the intraoperative spillage of intestinal contents. According to standard surgical wound classification systems referenced in the guidelines 1:

• Clean wounds (Class I): No entry into hollow viscera, no inflammation
• Clean-contaminated wounds (Class II): Controlled entry into hollow viscera without significant spillage
• Contaminated wounds (Class III): Gross spillage from gastrointestinal tract, acute inflammation without pus
• Dirty/Infected wounds (Class IV): Presence of pus, perforated viscera, or pre-existing infection

Clinical Implications

The distinction between clean-contaminated and contaminated is critical because:

Spillage Changes Everything

When intestinal contents spill into the operative field, even without pre-existing peritonitis, the wound moves from Class II to Class III. The absence of peritonitis means it's not Class IV (dirty), but the spillage itself represents gross contamination that exceeds the "controlled entry" definition of clean-contaminated.

Impact on Wound Management

The guidelines specifically address management of Class III wounds 1:

• Primary closure in contaminated wounds carries a 37% infection rate
• Delayed primary closure reduces this to 17%
• Vacuum-assisted closure can reduce infection rates to 0% in small studies

Antibiotic Duration

For contaminated wounds, antibiotic therapy should be continued beyond the standard prophylactic period until clinical signs of infection resolve, rather than the brief 24-hour course used for clean-contaminated cases 2.

Common Pitfalls to Avoid

1. Don't confuse "no peritonitis" with "clean-contaminated": The spillage itself defines the contamination level, regardless of pre-existing infection
2. Don't underestimate spillage: Even "minor" intestinal content spillage upgrades the wound classification
3. Consider wound management strategy: With Class III classification, strongly consider delayed primary closure or negative-pressure wound therapy rather than immediate primary closure to reduce the 37% SSI risk

Answer: C. Contaminated