Which of the following is NOT one of the three peritoneal signs of a surgical abdomen?

• A. Rebound
• B. Guarding
• C. Rigidity
• D. Pulsation

Answer: (D)

In the context of assessing for signs of a surgical abdomen, rebound tenderness, guarding, and rigidity are classical indicators that suggest irritation or inflammation of the peritoneum, commonly encountered in conditions such as appendicitis or peritonitis.

Rebound tenderness occurs when pressure is applied to the abdomen and quickly released, causing pain upon release, indicative of peritoneal irritation. Guarding refers to involuntary tensing of the abdominal muscles in response to palpation, as the body instinctively tries to protect an inflamed area. Rigidity, often described as a "board-like" abdomen, represents a more severe form of guarding where the abdominal muscles are contracted and cannot relax, further suggesting significant peritoneal irritation.

Pulsation, on the other hand, is not a recognized sign of peritoneal irritation. Instead, it might suggest underlying vascular abnormalities or an aneurysm, which are not typically associated with the classic presentation of a surgical abdomen requiring immediate surgical consultation. Therefore, identifying pulsation as NOT being one of the three peritoneal signs of a surgical abdomen is accurate, as it falls outside the classical signs used to diagnose peritoneal irritation.