1 — elective, clean-contaminated | A 54-year-old man undergoes elective right hemicolectomy for colon cancer |
2 — emergent, clean | A 24-year-old healthy man involved in a motor vehicle accident requires a laparotomy for a ruptured spleen |
3 — high-risk, clean | A 36-year-old woman with Crohn’s disease on steroid treatment has a small-bowel obstruction. An enterolysis is performed; there is no contamination of the abdominal cavity |
4 — high-risk, contaminated | A 64-year-old woman presents 2 yr after liver transplantation with perforated diverticulitis. Laparotomy reveals gross fecal contamination |