Which of the following will irritate the peritoneum the quickest?

• A. A kidney infection
• B. A ruptured appendix
• C. A fractured spleen
• D. A lacerated liver

Answer: (B)

The peritoneum reacts fastest to irritants that spill directly into the abdominal cavity from a hollow organ. When a hollow organ like the appendix ruptures, it releases bacteria and digestive fluids into the peritoneal space, causing chemical and bacterial irritation that quickly triggers peritoneal signs. A ruptured appendix thus provokes peritoneal irritation more rapidly than other injuries listed.

A kidney infection stays mainly in the kidney and is largely retroperitoneal, so it doesn’t deliver irritants to the peritoneum right away. Bleeding from a fractured spleen or a lacerated liver does involve the peritoneal cavity, but the irritative effect of blood is typically slower and less explosive than the chemical irritation from gastrointestinal contents.