A nurse is caring for a client with severe hyponatremia (serum sodium 118 mEq/L). Which nursing intervention should be the priority?
1Monitor for neurological changes and implement seizure precautions✓ 정답
2Encourage increased oral fluid intake to improve hydration status
3Administer loop diuretics to promote sodium retention
4Provide a high-sodium diet with added salt tablets
해설
Severe hyponatremia (sodium <120 mEq/L) requires priority monitoring for neurological changes and seizure precautions due to risk of cerebral edema. Other options (increased fluids, loop diuretics, high-sodium diet) can worsen hyponatremia or are inappropriate.
When a client presents with a serum sodium level of 118 mEq/L, the immediate and most critical threat is the neurological impact of cerebral edema. The core pathophysiological mechanism involves the osmotic shift of water from the hypotonic extracellular fluid into the brain cells. The brain's compensatory response, which involves extruding intracellular solutes to reduce swelling, takes time and is quickly overwhelmed when hyponatremia develops acutely or is very severe. This rapid cellular swelling increases intracranial pressure, directly leading to a spectrum of neurological symptoms ranging from confusion and lethargy to seizures, coma, and ultimately, fatal brainstem herniation.
Because of this direct and life-threatening risk, the priority nursing intervention is to monitor for neurological changes and implement seizure precautions. Frequent, focused neurological assessments are essential to detect early, subtle signs of deterioration, such as a change in the level of consciousness or a new headache, which may herald an impending seizure or herniation. Implementing seizure precautions—padding the side rails, ensuring suction and oxygen equipment are at the bedside, and having an established airway management plan—is a proactive safety measure to protect the client from injury should a seizure occur. This aligns directly with the findings from the ELECTROHEALTH study, which examined electrolyte imbalances in older in-patients and confirmed that such disturbances are associated with adverse clinical outcomes, including mortality and rehospitalization [3]. The study underscores that the initial serum sodium level on admission is a critical marker for poor health trajectories, making its neurological manifestations the nurse's primary focus.
Why Other Interventions Are Not the Priority
The other options, while potentially relevant to the broader management of hyponatremia, are incorrect as the priority action because they do not address the immediate, life-threatening risk of cerebral edema.
- Encouraging increased oral fluid intake is contraindicated in the context of severe, likely dilutional, hyponatremia. The client already has an excess of water relative to sodium; adding more free water would further dilute the serum sodium and worsen the cerebral edema. Fluid restriction, not encouragement, is the typical cornerstone of management in euvolemic or hypervolemic hyponatremia.
- Administering loop diuretics to promote sodium retention is physiologically inaccurate. Loop diuretics, such as furosemide, are potent inhibitors of the sodium-potassium-chloride cotransporter in the thick ascending limb of the loop of Henle. Their primary effect is to promote the excretion of sodium and free water, not sodium retention. While they are sometimes used in hypervolemic hyponatremia to induce a net water loss, their administration requires extreme caution and is not an independent nursing intervention. A study on drug-induced hyponatremia identified thiazide diuretics as the most frequently implicated pharmacological class in causing hyponatremia, highlighting the complex relationship between diuretics and sodium balance . The priority remains neurological protection, not unilaterally administering a medication that could potentially worsen the sodium deficit if mismanaged.
- Providing a high-sodium diet with added salt tablets is a slow, oral replacement strategy suitable for chronic, mild, and asymptomatic hyponatremia. In a severe case with a serum sodium of 118 mEq/L, the correction must be carefully controlled and is typically achieved through intravenous hypertonic saline in a closely monitored setting. Oral replacement is far too slow to address the acute neurological threat and carries a risk of overly rapid correction if the client's underlying physiology suddenly changes, which can lead to osmotic demyelination syndrome. The impact of nephrology consultation on moderate and severe hyponatremia outcomes demonstrates that these cases require a specialized, multi-faceted approach to manage sodium correction rates safely, far beyond simple dietary changes . The nurse's immediate role is not to initiate a new diet order but to ensure the client's safety from neurological complications while the medical team determines the definitive treatment strategy.
References (research sources)
[3]
The role of electrolytes imbalance in determining poor health outcomes in a cohort of older in-patients: the ELECTROHEALTH study.Research articleFratangelo L, Dotto E, D'Amelio P. (2026) · DOI: 10.1007/s40520-026-03358-8
Clinical Practice Guide: Severe Hyponatremia (Na+ 118 mEq/L)
Immediate Priority Assessment
The primary threat is cerebral edema leading to increased intracranial pressure. Perform a focused neurological assessment every 1-2 hours, monitoring for:
Change in level of consciousness (lethargy, confusion)
New onset or worsening headache
Nausea and vomiting
Muscle twitching or tremors
Seizure activity
Safety Interventions
Implement seizure precautions immediately upon identifying severe hyponatremia:
Pad side rails and keep bed in lowest position
Ensure suction equipment and oxygen are functional at bedside
Establish IV access for emergency medication administration
Keep an oral airway and bag-valve mask readily available
Collaborative Management
Notify the provider of the critical sodium level and neurological assessment findings. Anticipate orders for controlled sodium replacement, typically with hypertonic saline in an intensive care setting. Correction must be gradual (no more than 6-8 mEq/L in 24 hours) to avoid osmotic demyelination syndrome. Fluid restriction may be initiated if the cause is dilutional. Avoid interventions that lower sodium further, such as encouraging free water intake or administering hypotonic IV fluids.
Ongoing Monitoring
Monitor serum sodium levels every 2-4 hours during active correction. Strictly document intake and output. Continuously observe for signs of overcorrection, including new neurological deficits, dysphagia, or behavioral changes that could indicate central pontine myelinolysis.
Cerebral Edema — Brain swelling caused by osmotic water shift into brain cells due to hypotonic extracellular fluid in severe hyponatremia, leading to increased intracranial pressure.
Seizure Precautions — Safety interventions including padded side rails, suction and oxygen setup, and airway management readiness to protect a patient during a potential seizure.
Osmotic Shift — Movement of water from a low-solute (hypotonic) extracellular compartment into a high-solute (intracellular) compartment, causing cellular swelling in hyponatremia.
Brainstem Herniation — A fatal complication of severe cerebral edema where increased intracranial pressure forces brain tissue downward through the foramen magnum.
Serum Sodium — A laboratory measurement of sodium concentration in the blood; a level of 118 mEq/L indicates severe hyponatremia with high risk for neurological emergencies.