Correct Answer: B

Rationale: In acute renal failure with a high serum potassium level, the priority intervention is to lower potassium levels to prevent complications like cardiac arrhythmias. Administering a retention enema of Kayexalate is the correct action as it helps lower high potassium levels by exchanging sodium for potassium in the intestines. Options A, C, and D are incorrect. Administering normal saline rapidly and NPH insulin or adding more potassium to the IV solution can further increase potassium levels, worsening the condition. Lidocaine is not indicated for treating hyperkalemia.

Correct Answer: A

Rationale: The correct first action when administering medications to a client with a nasogastric tube is to check for tube placement. This is crucial to ensure that the medications are delivered to the correct location within the gastrointestinal tract. Checking the tube placement helps prevent complications such as medication entering the lungs if the tube is misplaced. Crushing the medications (choice B) or flushing the tube with water (choice C) should only be done after confirming the correct tube placement. Administering the medications (choice D) without verifying the tube placement can lead to serious consequences.

Correct Answer: B

Rationale: The correct answer is to notify the healthcare provider if there is any drainage at the catheterization site. Drainage at the site can be a sign of infection, which needs prompt evaluation and treatment. Choices A, C, and D are not as crucial as identifying and reporting any drainage, which is more directly related to potential complications post-cardiac catheterization.

Correct Answer: D

Rationale: The maximum dosage the nurse should administer is 2 mg. This is calculated based on the prescription of 0.4 mg IM every 2 hours, not to exceed 5 doses. Since the medication is available in ampules containing 0.2 mg/ml, the nurse should administer 2 ml (0.2 mg/ml x 10 ml) for each dose, not exceeding 5 doses. Therefore, the nurse should limit the client's oral intake to 900 to 1,000 ml, to avoid exceeding the maximum dosage of 2 mg.

Correct Answer: D

Rationale: The correct answer is D: Red. The client's vital signs indicate critical condition with a high pulse and low blood pressure, suggesting shock. A red tag is used to identify patients who require immediate attention and should be prioritized for treatment. Choice A, Black, is incorrect as it is typically used for deceased or expectant clients. Choice B, Yellow, is used for clients with non-life-threatening injuries who require medical care but can wait. Choice C, Green, is for clients with minor injuries who can wait the longest for treatment. Therefore, in this scenario, the client's condition warrants a red triage tag for immediate attention.