A 65-year-old patient is admitted to the hospital with a serum sodium level of 132 mmol/L. Despite being asymptomatic at admission, the patient begins to complain of a general feeling of being "washed out" and lacking energy. What is the most likely earliest symptom of hyponatremia in this patient?

1. A

   Fatigue

2. B

   Ataxia

3. C

   Thirst

4. D

   Weakness

Appeared in: NORCET 6 Prelims -2024

Explanation

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• Fatigue, malaise, and lethargy are among the earliest and most common symptoms of mild hyponatremia, as confirmed by sources like Brunner & Suddarth's textbook.
• The patient's subjective complaint of feeling 'washed out' and 'lacking energy' is a classic description of fatigue.
• A sodium level of 132 mmol/L is classified as mild hyponatremia, a stage where subtle, non-specific symptoms are expected to appear first before progressing to more severe neurological signs.

Why Other Options Were Wrong

• Option B: Ataxia, or impaired coordination, is a sign of significant central nervous system dysfunction due to cerebral edema. It is associated with moderate to severe hyponatremia, not an early symptom.
• Option C: Thirst is the body's mechanism to increase water intake to dilute high solute concentrations. Therefore, it is a hallmark symptom of hypernatremia (high sodium), not hyponatremia.
• Option D: While muscle weakness is a symptom of hyponatremia, it is generally a more progressive sign than the initial, vague feeling of fatigue. Fatigue often precedes demonstrable muscle weakness.

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Clinical Relevance

• Nursing practice connection: Knowing Recognition of early symptoms of mild hyponatremia helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
• Recognizing subtle, early symptoms like fatigue is a critical nursing skill for early intervention in electrolyte imbalances, especially in older adults who are at higher risk and may have atypical presentations.
• Early detection and treatment of hyponatremia can prevent progression to more severe, life-threatening neurological complications such as seizures, brain herniation, and coma.
• What if? If the patient's sodium level was 122 mmol/L and they were confused, the nursing priority would shift dramatically. The focus would be on immediate patient safety (seizure precautions), frequent neurological assessments, and preparing for urgent medical intervention, possibly including the administration of hypertonic saline in a critical care setting.

How to Approach the Question

• First, identify the key clinical data in the stem: a 65-year-old patient with a serum sodium of 132 mmol/L.
• Next, interpret this lab value. A sodium level of 132 mmol/L is below the normal range of 135-145 mmol/L, confirming mild hyponatremia.
• Analyze the core of the question, which asks for the 'most likely earliest symptom'. This directs you to look for subtle, initial signs rather than severe complications.
• Evaluate the options in the context of mild versus severe hyponatremia. Fatigue is a non-specific, early symptom. Ataxia is a late, severe symptom. Thirst is a symptom of the opposite condition (hypernatremia). Weakness is possible but fatigue is often more primary.
• Connect the patient's subjective complaints ('washed out,' 'lacking energy') to the most appropriate clinical term among the options, which is 'Fatigue'.

Concept Tested & Keywords

• Concept Tested: Recognition of early symptoms of mild hyponatremia.
• Stem keywords: hyponatremia, serum sodium level, 132 mmol/L, earliest symptom, washed out, lacking energy
• Lead-in keywords: most likely
• Clinical cues: 65-year-old patient (older adults are at higher risk for electrolyte imbalances)
• Clinical cues: Serum sodium 132 mmol/L (indicates mild hyponatremia)

Question ID

QblOxenLuimP8JZH68eg3Q

Copy ID

Reference Book

E6 Nursing Brunner Adult Health 3SA Vol 1 Part 1 p. 146-148

E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 538-540