Correct Answer: C

Rationale: An oxygen saturation of 85% is significantly low for a client with COPD and indicates hypoxemia, requiring immediate intervention. In COPD, the body's ability to oxygenate adequately is already compromised, so a saturation of 85% is particularly concerning. A barrel-shaped chest and use of accessory muscles are common findings in COPD due to chronic air trapping and increased work of breathing. While a respiratory rate of 28 breaths per minute is elevated, a low oxygen saturation is a more critical finding that necessitates prompt attention.

Correct Answer: D

Rationale: In this scenario, the nurse is dealing with a lethargic client with concerning vital signs after a PCA infusion of morphine sulfate. The next assessment the nurse should perform is to observe the amount and dose of morphine in the PCA pump syringe. This is crucial to evaluate for possible overdose, as the client's symptoms could be indicative of opioid toxicity. Checking the morphine amount and dose will help the nurse adjust the treatment accordingly. Choices A, B, and C do not directly address the potential cause of the client's lethargy and abnormal vital signs related to the morphine infusion.

Correct Answer: D

Rationale: Elevating the head of the bed to 45 degrees is crucial for clients receiving enteral feedings via a nasogastric tube to prevent aspiration. Aspiration can lead to serious complications such as pneumonia. Auscultating the client's lungs for breath sounds (choice A) is important but not as urgent as preventing aspiration. Checking the client's blood glucose level (choice B) and monitoring bowel sounds (choice C) are also essential aspects of care for a client receiving enteral feedings, but they do not take precedence over preventing aspiration.

Correct Answer: A

Rationale: A serum potassium level of 6.0 mEq/L is most concerning in a client with ESRD scheduled for hemodialysis as it indicates hyperkalemia, which can lead to serious cardiac complications such as arrhythmias and cardiac arrest. Immediate intervention is required to lower potassium levels. Choice B, serum creatinine of 2.5 mg/dL, is elevated but expected in ESRD due to impaired kidney function. Choice C, serum calcium of 8.0 mg/dL, is within the normal range and not typically a priority in this situation. Choice D, hemoglobin of 10 g/dL, is slightly low but not an immediate concern for a client scheduled for hemodialysis unless significantly lower and causing severe symptoms.

Correct Answer: C

Rationale: The correct needle to use for administering intravenous fluids via an implanted port is a non-coring (Huber) needle. This type of needle is specifically designed to access implanted ports without coring the septum, which helps prevent damage. Choice A, the one with the clamp and no needle, is incorrect as it does not describe a needle suitable for accessing an implanted port. Choice B, a butterfly needle, is not typically used for accessing implanted ports. Choice D, a standard hypodermic needle, is not ideal for accessing ports as it can damage the septum.