Correct Answer: A

Rationale: A distended, board-like abdomen is a concerning sign indicating the possibility of a ruptured appendix and peritonitis, which are medical emergencies. Reporting this finding immediately is crucial for prompt intervention. Choice B, an elevated WBC count, could indicate infection but is not as urgent as the risk of a ruptured appendix. Choice C, rebound tenderness over McBurney's point, is a classic sign of appendicitis but does not indicate an immediate threat like a possible rupture. Choice D, a slightly elevated temperature, is a nonspecific finding and not as critical as the risk of peritonitis associated with a distended, board-like abdomen.

Correct Answer: B

Rationale: When using the ABC approach to client care, the nurse should identify that the priority intervention is administering oxygen. In this scenario, the client's oxygen saturation is only 91%, which is below the normal range of 95% and above. Oxygen is essential for adequate tissue perfusion and oxygenation of vital organs. Administering oxygen takes precedence over other interventions to ensure the client's physiological needs are met first. Choice A can be addressed after ensuring adequate oxygenation. Choice C is important for preventing postoperative complications but is not as urgent as addressing oxygen saturation. Choice D is a common postoperative intervention, but in this case, ensuring adequate oxygenation is the priority over IV fluid administration.

Correct Answer: D

Rationale: The correct answer is D. During an electromyography (EMG) procedure, small needle electrodes are inserted into the muscles to identify muscle weakness and evaluate local nerve responses. This information is crucial for the client to know beforehand. Choice A is incorrect because radioisotopes are not used in EMG procedures. Choice B is incorrect because flushing is not a common occurrence during EMG. Choice C is incorrect because claustrophobia is more relevant to MRI or CT scans, not EMG procedures.

Correct Answer: D

Rationale: The correct answer is D. The nurse should instruct the client to avoid corticosteroids and vitamin C prior to testing to prevent false-positive results. Choice A is incorrect because stool samples from bowel movements, not from digital rectal examinations, are used for FOBT. Choice B is incorrect because a stimulant laxative is not typically prescribed before FOBT; rather, the client is instructed to follow specific dietary restrictions. Choice C is incorrect because biennial fecal occult blood testing for colorectal cancer screening usually begins at 50 years old, not 40.

Correct Answer: B

Rationale: The correct answer is B: Respiratory alkalosis. In this scenario, the client is hyperventilating, leading to excessive elimination of carbon dioxide. As a result, the PaCO2 decreases, causing a decrease in hydrogen ion concentration and an increase in pH, resulting in respiratory alkalosis. Choice A, Respiratory acidosis, is incorrect because the ABG results show a low PaCO2, not an elevated one. Choices C and D, Metabolic acidosis and Metabolic alkalosis, do not align with the ABG results provided, which point towards a respiratory, not metabolic, imbalance.