A patient with acute renal failure has a serum potassium level of 7 mEq/L. The duty nurse's priority for this patient is to assess?

1. A

   Urine specific gravity

2. B

   Electrocardiogram (ECG)

3. C

   Mental status

4. D

   Blood pressure

Appeared in: ISRO 2024

Explanation

• A serum potassium level of 7.0 mEq/L is classified as severe hyperkalemia, a medical emergency.
• The most immediate and life-threatening complication of severe hyperkalemia is its effect on cardiac electrical conduction.
• Elevated potassium can lead to dangerous arrhythmias such as ventricular fibrillation or asystole, which can be fatal.
• Therefore, the priority assessment is to monitor the heart's electrical activity using an electrocardiogram (ECG) to detect these changes immediately.

Why Other Options Were Wrong

• Option A: Assessing urine specific gravity measures the kidney's ability to concentrate urine. This is relevant for monitoring the overall status of renal failure but does not address the immediate, life-threatening risk of cardiac arrest posed by severe hyperkalemia.
• Option C: While severe electrolyte imbalances and uremia can cause changes in mental status (e.g., confusion, lethargy), this is a less immediate threat than cardiac arrest. Cardiac toxicity from hyperkalemia can occur rapidly and without other preceding symptoms.
• Option D: Blood pressure monitoring is crucial for managing fluid balance in a patient with acute renal failure. However, the immediate danger from a potassium level of 7.0 mEq/L is electrical (arrhythmia), not hemodynamic (hypo- or hypertension).

Related Visual

Clinical Relevance

• Nursing practice connection: Knowing Priority nursing assessment for a patient with severe hyperkalemia secondary to acute renal failure helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
• For any patient with a critical potassium level (greater than 6.5 mEq/L), the nurse's first action is to place the patient on a continuous cardiac monitor and obtain a 12-lead ECG.
• This is a patient safety and escalation priority. The nurse must immediately inform the physician of the critical lab value and any ECG abnormalities.
• Emergency treatment for severe hyperkalemia includes administering IV calcium gluconate to stabilize the heart, IV insulin and glucose to shift potassium into cells, and preparing for definitive removal of potassium via diuretics, exchange resins, or dialysis.

How to Approach the Question

• First, identify the key information in the question: a patient with acute renal failure has a serum potassium of 7.0 mEq/L.
• Recognize that a potassium level of 7.0 mEq/L is critically high (normal is 3.5-5.0 mEq/L) and constitutes a medical emergency.
• Recall the primary and most life-threatening complication of severe hyperkalemia. This is its effect on the heart's electrical system.
• Apply the principle of prioritizing the most immediate threat to life. In this case, the risk of a fatal cardiac arrhythmia outweighs other systemic effects.
• Evaluate the options based on this priority. An ECG directly assesses the heart's electrical activity, which is the primary concern. The other options (urine specific gravity, mental status, blood pressure) assess important but less immediately life-threatening aspects of the patient's condition.

Concept Tested & Keywords

• Concept Tested: Priority nursing assessment for a patient with severe hyperkalemia secondary to acute renal failure.
• Stem keywords: acute renal failure, serum potassium, 7 mEq/L, priority, assess
• Lead-in keywords: priority
• Clinical cues: Potassium level of 7.0 mEq/L indicates severe, life-threatening hyperkalemia.
• Clinical cues: The patient has acute renal failure, which is the likely cause of the hyperkalemia due to decreased potassium excretion.

Question ID

Qfrh22fucoWrVfLxj5CLYO

Copy ID

Reference Book

E6 Nelson Textbook of Pediatrics(2024) — Volume 2 p. 1048-1050

E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 542-544