A charge nurse in a long-term care facility is developing an educational program for staff members about common physiological changes in older adults. Which of the following information should the nurse include?

A. Positive leukocyte esterase is a laboratory finding typically identified during a urinalysis to screen for the presence of white blood cells. While this may indicate a urinary tract infection or renal calculi, it is not a diagnostic marker for an inflamed appendix. In appendicitis, the primary biochemical changes are systemic rather than localized to the urinary excretion system. The nurse would not expect this specific finding to confirm a diagnosis of appendiceal inflammation.

B. Increased pain upon the sudden release of deep abdominal palpation is known as rebound tenderness or Blumberg sign. This clinical phenomenon occurs when the parietal peritoneum is irritated due to the inflammatory process of the adjacent appendix. It is one of the most reliable physical examination findings for identifying peritoneal irritation associated with acute appendicitis. The nurse should expect this reaction during the provider's assessment of the right lower quadrant.

C. A white blood cell (WBC) count of 9,500 mm3 falls within the standard physiological reference range for a healthy adult. In a client with acute appendicitis, the nurse would instead expect to see significant leukocytosis, typically exceeding 10,000 to 18,000 mm3. This elevation in the leukocyte count reflects the body's systemic inflammatory response to the localized infection. A normal count like 9,500 mm3 would be atypical for a client with an actively inflamed appendix.

D. Pain from flexion of the left thigh while lying on the right side is not a characteristic sign of appendicitis. The psoas sign, which is associated with appendicitis, involves pain upon extension or flexion of the right thigh, as the appendix sits in the right iliac fossa. Flexing the left thigh does not cause the anatomical tension required to irritate an inflamed appendix. This finding would suggest a different pathology or involve an unaffected anatomical region.

A) Metabolic acidosis: In metabolic acidosis, you would expect a low pH (acidosis) with a low bicarbonate (HCO3-) level. However, the given bicarbonate level is within the normal range (22-26 mEq/L), which indicates the acidosis is not metabolic in origin.

B) Metabolic alkalosis: Metabolic alkalosis would present with a high pH (alkalosis) and an elevated bicarbonate (HCO3-) level. The pH in this case is low, indicating acidosis, and the bicarbonate level is normal, ruling out metabolic alkalosis.

C) Respiratory alkalosis: In respiratory alkalosis, you would see a high pH (alkalosis) and a low PaCO2 due to hyperventilation. The given pH is low, indicating acidosis, and the PaCO2 is elevated, which is inconsistent with respiratory alkalosis.

D) Respiratory acidosis: Respiratory acidosis is characterized by a low pH (acidosis) and an elevated PaCO2 due to hypoventilation or impaired gas exchange. The client's ABG results show a low pH (7.2), a normal bicarbonate level (26 mEq/L), and an elevated PaCO2 (52 mm Hg), indicating the client is experiencing respiratory acidosis.