What assessment finding would indicate perforation of a peptic ulcer?

The indication of perforation of a peptic ulcer is represented by a rigid, boardlike abdomen. This finding is a result of the irritation of the peritoneal cavity, which occurs when the ulcer breaches the stomach or duodenum wall, allowing gastric contents to spill into the abdominal cavity. The body's response to this irritation leads to involuntary muscle guarding or rigidity in the abdominal wall, which can often feel hard and tense to the touch, resembling a board.

In assessing other options, bradycardia could occur due to stress or pain but is not a specific sign of perforation. Nausea and vomiting are common symptoms related to various gastrointestinal conditions, not solely indicative of perforation. Numbness in the legs is unrelated to peptic ulcers and does not provide any relevant information regarding gastrointestinal perforation. Therefore, the presence of a rigid, boardlike abdomen serves as a crucial clinical sign that indicates potential perforation of a peptic ulcer and requires immediate medical attention.