A 60-year-old patient presents with lethargy and muscle weakness. Laboratory results reveal serum sodium of 150 mEq/L and potassium of 5 mEq/L. What is the most appropriate initial management?

1. A

   Administer 3% hypertonic saline

2. B

   Initiate intravenous 5% dextrose in water (D5W)

3. C

   Begin intravenous 0.9% normal saline with potassium chloride supplementation

4. D

   Restrict fluid intake

Appeared in: NORCET 8 Prelims-2025

Explanation

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• The patient's serum sodium of 150 mEq/L confirms a diagnosis of hypernatremia.
• The primary treatment for hypernatremia is the replacement of the free water deficit to dilute the serum sodium concentration.
• Intravenous 5% dextrose in water (D5W) is metabolized in the body to provide free water, which is hypotonic and effectively lowers the serum sodium level.
• This addresses the cellular dehydration causing the patient's symptoms of lethargy and weakness.

Why Other Options Were Wrong

• Option A: 3% hypertonic saline is a high-sodium solution that would dangerously worsen the patient's existing hypernatremia.
• Option C: This option is incorrect for two reasons: 0.9% Normal Saline is not the most effective fluid for lowering sodium, and supplementing potassium when the level is already high-normal (5.0 mEq/L) is contraindicated and risks causing life-threatening hyperkalemia.
• Option D: Fluid restriction would worsen the patient's dehydration and hypernatremia. The patient has a water deficit that needs to be corrected.

Related Visual

• Visual 1: Diagram: A visual showing the effect of a hypertonic ECF on a body cell, illustrating water moving out of the cell, causing it to shrink. A second panel can show how a hypotonic solution (like D5W after metabolism) reverses this process.
• Visual 2: Flowchart: A simple algorithm for the initial management of hypernatremia, starting with assessing volume status and then choosing the appropriate IV fluid (e.g., D5W for euvolemic/hypervolemic, 0.9% NS for hypovolemic).
• Visual 3: Infographic: A summary of the signs, causes, and treatments for hypernatremia vs. hyponatremia to highlight the key differences.

Clinical Relevance

• Nursing practice connection: Knowing Management of Hypernatremia helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
• A key nursing responsibility is the slow and careful correction of hypernatremia. Lowering sodium too quickly can cause a rapid shift of water into brain cells, leading to cerebral edema, seizures, permanent brain damage, or death.
• Nurses must meticulously monitor neurological status, vital signs, and serum sodium levels (as ordered, often every 2-4 hours) during treatment.
• Always double-check laboratory values before administering any electrolyte-containing solutions. In this case, noting the high-normal potassium of 5.0 mEq/L is crucial to prevent a medication error with potassium chloride.

How to Approach the Question

• First, identify and interpret the key laboratory values provided in the question. A sodium level of 150 mEq/L is above the normal range of 135-145 mEq/L, indicating hypernatremia.
• Recognize that the patient's symptoms (lethargy, muscle weakness) are consistent with the neurological impact of hypernatremia.
• Understand the fundamental treatment goal for hypernatremia: to replace the free water deficit and dilute the serum sodium.
• Evaluate each IV fluid option based on its tonicity and effect in the body. D5W becomes hypotonic and provides free water.
• Consider any contraindications. The patient's potassium is 5.0 mEq/L, making any potassium supplementation dangerous.
• Eliminate options that are clearly incorrect or harmful: 3% saline (for hyponatremia), fluid restriction (for hyponatremia), and NS with KCl (contraindicated K+).

Concept Tested & Keywords

• Concept Tested: Management of Hypernatremia
• Stem keywords: lethargy, muscle weakness, serum sodium of 150 mEq/L, potassium of 5 mEq/L
• Lead-in keywords: most appropriate initial management
• Clinical cues: Serum sodium of 150 mEq/L indicates hypernatremia.
• Clinical cues: Potassium of 5.0 mEq/L is at the upper limit of normal, making potassium supplementation dangerous.

Question ID

Q-5iKh-273ZwUzX21WyrFB

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