Correct Answer: A

Rationale: In a patient with a fractured femur, weak palpable distal pulses can indicate compromised circulation to the lower extremity. This finding suggests a potential vascular compromise that requires immediate intervention to prevent further complications like compartment syndrome or ischemia. Pain at the fracture site, mild swelling of the leg, and bruising around the fracture site are expected following such an injury and surgical stabilization, and while they should be monitored, they do not require immediate intervention like addressing compromised circulation.

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: A

Rationale: A serum potassium level of 6.5 mEq/L is concerning in a client with CKD as it indicates hyperkalemia, which requires immediate intervention to prevent cardiac complications. Hyperkalemia can lead to life-threatening arrhythmias, particularly in patients with impaired kidney function. Serum sodium, creatinine, and blood glucose levels, while important, are not as acutely dangerous as severe hyperkalemia in this context.

Correct Answer: B

Rationale: Before hemodialysis in a client with end-stage renal disease (ESRD), monitoring serum potassium closely is crucial. ESRD patients are at risk of hyperkalemia, which can lead to severe cardiac complications. Checking serum potassium levels helps in assessing and managing this electrolyte imbalance. Serum creatinine (Choice A) is a marker of kidney function but is not the most critical value to monitor before hemodialysis. Serum sodium (Choice C) may be affected in renal disease, but potassium is a more crucial electrolyte to monitor. Hemoglobin (Choice D) is essential for assessing anemia in ESRD but is not the primary focus before hemodialysis.

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.