Conditions › Fluids, electrolytes & acid-base
Hyponatremia Nursing Care Plan and Interventions
Hyponatremia is a sodium below 135 mEq/L; nursing care starts with neuro checks and seizure precautions because water shifts into brain cells. Treat by volume status (fluid restriction for too much water, saline for losses, 3% saline only for severe symptoms) and raise sodium slowly to avoid osmotic demyelination.
Hyponatremia nursing care plan
| Nursing problem | Goal | Key interventions |
|---|---|---|
| Risk for injury (seizures, confusion) | No seizures; mental status at baseline. | |
| Fluid imbalance (excess water or sodium loss) | Sodium rises within the ordered limit per 24 hours. | |
| Health maintenance: needs teaching | Follows the fluid plan and knows which symptoms to report. |
Problem wording is plain-language nursing diagnosis style. Your program may require NANDA-I labels and your own assessment data.
What it is
Hyponatremia
Serum sodium below 135 mEq/L (normal 135 to 145). Usually too much water for the sodium, so water moves into cells. 1,2
Brain cells swell inside a closed skull, so neuro changes are the danger.
Hyponatremia causes
Water gain: SIADH, heart failure, drinking only plain water, hypotonic IV fluid. Sodium loss: vomiting, diarrhea, diuretics. 2,3
Check volume: dry (low BP, fast pulse), edema, or neither (SIADH). It decides the treatment.
Assessment: what you will see
Hyponatremia cues
Headache, nausea, lethargy, confusion, muscle weakness, decreased reflexes, then seizures. Below 120 mEq/L: coma risk. 1,4
Low sodium plus new confusion is a brain cue: act before it becomes a seizure.
Priority: what the nurse does first
Hyponatremia priority action
Protect the brain: seizure precautions, frequent neuro checks, report any mental status change at once. Strict I&O, daily weight. 4,2
Working: mental status clears, reflexes return, sodium rises slowly toward normal.
Nursing interventions and treatment
Treat by volume status
Dry: isotonic 0.9% saline. Water overload (SIADH, heart failure): fluid restriction. Stop any hypotonic IV fluid. 3
A dry, vomiting client needs saline, not a fluid restriction: match the fix to the volume status.
Hypertonic 3% saline
For severe symptoms such as seizures or delirium: small IV boluses of hypertonic (3%) saline, sodium checked between doses. 3
The goal is a small first rise to ease brain swelling, not a normal sodium right away.
Evaluation: is care working?
Raise sodium slowly
Raise sodium no more than 8 mEq/L in the first 24 hours. Too fast causes osmotic demyelination, which can be permanent. 2,3
New trouble speaking or swallowing after a fast sodium rise: report it now.
Client teaching
Hyponatremia teaching
Keep to any fluid limit. Report headache, nausea or confusion. Athletes replace sweat with salt-containing drinks, not plain water. 1,2
Long race on a hot day: a sports drink, not gallons of plain water.
NCLEX traps
Hyponatremia vs hypernatremia
Low: too much water, brain cells swell, headache, confusion. High: too little water, cells shrink, intense thirst. Both can seize. 2
Both hurt the brain, so correct both slowly: low and slow, high and slow.
Keep studying hyponatremia in NurseLingo Pro
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Test yourself: free fluid and electrolyte practice questions with answers and rationales.
Frequently asked questions
What are the priority nursing diagnoses for hyponatremia?
Common nursing problems for hyponatremia include risk for injury (seizures, confusion); fluid imbalance (excess water or sodium loss); health maintenance: needs teaching. Choose the ones your assessment supports and rank airway, breathing and circulation problems first.
What does the nurse do first for hyponatremia?
Protect the brain: seizure precautions, frequent neuro checks, report any mental status change at once. Strict I&O, daily weight.
What is the difference between hypernatremia and hyponatremia?
Hyponatremia is a sodium below 135 mEq/L, usually too much water for the sodium, so cells swell. Hypernatremia is a sodium above 145 mEq/L, usually too little water, so cells shrink. Both mainly affect the brain, causing confusion and, if severe, seizures.
How is acute hyponatremia managed?
Treatment depends on volume status: saline for a dry client, fluid restriction for water overload, and small doses of 3% hypertonic saline for severe symptoms such as seizures. Sodium is raised slowly, usually by no more than 8 to 10 mEq/L in the first 24 hours (less for high-risk clients, per the order), to avoid brain injury.
More fluids, electrolytes & acid-base
Related cheat sheets
Sources
- OpenStax Pharmacology for Nurses, 5.2
- OpenStax Medical-Surgical Nursing, 10.3
- merckmanuals.com
- OpenStax Medical-Surgical Nursing, 21.4
For study only, not medical advice. Follow your program, your facility's policies and the provider's orders.