A nurse is assisting with the care of a client in the emergency department who is undergoing an abdominal CT with contrast, laboratory CBC testing, and IV access initiation. The nurse is reviewing the client's findings and laboratory results to determine complications. The client is at greatest risk for developing which of the following conditions as evidenced by which of the following findings.

The scenario requires identifying acute clinical complications from diagnostic and assessment findings. Nurses must apply knowledge of perfusion dynamics and inflammatory processes to recognize that dropping hemodynamic trends point toward a life-threatening vascular volume loss rather than localized peritoneal inflammation. Choice A rationale Rebound tenderness indicates parietal peritoneal irritation from inflammation or infection, which occurs in pelvic peritonitis. However, the cumulative clinical indicators and immediate drop in perfusion metrics do not make peritonitis the highest risk complication for this client. Choice B rationale Hypotension and worsening tachycardia indicate significant intravascular volume depletion from acute bleeding. Hemorrhage is the highest risk complication because rapid blood loss directly compromises systemic perfusion, requiring immediate volume resuscitation and source control. Choice C rationale Metabolic alkalosis is an acid-base imbalance characterized by an elevated arterial pH greater than 7.45 and bicarbonate greater than 26 mEq/L. It is not caused or evidenced by acute changes in systemic blood pressure. Choice D rationale Pelvic peritonitis is a localized or generalized inflammatory process of the peritoneum. While severe sepsis from peritonitis can eventually cause distributive shock and hypotension, blood pressure alone is not the primary diagnostic evidence for peritonitis.