Correct Answer: A

Rationale: Administering insulin is the most crucial intervention in managing diabetic ketoacidosis. Insulin helps reduce blood glucose levels and correct metabolic acidosis, which are the primary issues in DKA. Monitoring urine output (Choice B) is important but not as critical as administering insulin. Assessing the client's level of consciousness (Choice C) is essential but does not directly address the underlying cause of DKA. Obtaining an arterial blood gas sample (Choice D) can provide valuable information but is not as urgent as administering insulin to address the immediate metabolic imbalance.

Correct Answer: D

Rationale: The correct answer is D: Evidence of hypoventilation. In a client with muscular dystrophy and progressive kyphoscoliosis, hypoventilation indicates respiratory muscle weakness and can lead to life-threatening respiratory distress. Immediate intervention is crucial to prevent complications. Choices A, B, and C are incorrect because while extremity muscle weakness, bilateral eyelid drooping, and inability to swallow pills are concerning symptoms in muscular dystrophy, evidence of hypoventilation poses a more immediate threat to the client's respiratory status.

Correct Answer: C

Rationale: The correct answer is C: Orthopnea. If the client is orthopneic, the nurse needs to adapt the insertion position that does not place the client in a supine position. This means the head of the bed should be elevated as much as possible to facilitate catheter insertion without compromising the client's breathing. High urinary pH (choice A) is not directly relevant to the insertion position of a urinary catheter. Abdominal ascites (choice B) may impact the procedure due to abdominal distension but is not as crucial as orthopnea. Fever (choice D) does not specifically affect the client's position for urinary catheter insertion.

Correct Answer: D

Rationale: A platelet count of 90,000/mm3 is low and concerning for a client scheduled for a renal biopsy, as it increases the risk of bleeding. Thrombocytopenia, indicated by a low platelet count, can lead to impaired blood clotting, posing a significant risk of bleeding during or after the biopsy procedure. Elevated serum creatinine levels may be expected in chronic kidney disease but are not directly related to bleeding risk during a renal biopsy. Prothrombin time and hemoglobin levels are not as directly relevant to the bleeding risk associated with a renal biopsy as platelet count.

Correct Answer: C

Rationale: Before a CT scan with contrast, the nurse should review the serum creatinine level. This is crucial in assessing kidney function because contrast agents can potentially worsen renal function, leading to contrast-induced nephropathy. Monitoring serum creatinine helps in identifying patients at risk and taking necessary precautions. Serum potassium (Choice A) is important in conditions like hyperkalemia but is not the priority before a contrast CT scan. Blood urea nitrogen (BUN) (Choice B) is another renal function test but is not as specific as serum creatinine for assessing kidney function. Serum glucose (Choice D) is important in monitoring blood sugar levels, especially in diabetic patients, but it is not directly related to the risk of contrast-induced nephropathy in this scenario.