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Acute Hyponatremia Management - Hospitalist

Acute Hyponatremia Management - Hospitalist: Hyponatremia Detected → Severity Assessment → SEVERE: Immediate Treatment → Confirm True Hypotonic Hyponatr...

Pathway Overview

11 steps

Algorithm Steps

11 total

  1. 01Start

    Hyponatremia Detected

    Na+ <135 mEq/L

  2. 02Decision

    Severity Assessment

    Symptoms and sodium level

    • SEVERE SYMPTOMS:
    • - Seizures, coma
    • - Severe confusion
    • - Respiratory distress
    • MODERATE SYMPTOMS:
    • - Nausea/vomiting
    • - Confusion, headache
    • MILD/ASYMPTOMATIC:
    • - Na 125-134 without symptoms
  3. 03Warning

    SEVERE: Immediate Treatment

    Symptomatic or Na+ <120

    • HYPERTONIC SALINE (3% NaCl):
    • - 100-150 mL IV over 10-20 min
    • - Goal: Raise Na+ by 4-6 mEq/L
    • - Can repeat x1-2 if still symptomatic
    • THEN slow down:
    • - Max 8-10 mEq/24h total correction
    • - Check Na+ q2h initially
    • ICU admission recommended
  4. 04Action

    Confirm True Hypotonic Hyponatremia

    Rule out pseudo- and non-hypotonic

    • CHECK SERUM OSMOLALITY:
    • Normal/High Osm (>280):
    • - Pseudohyponatremia (hyperlipidemia)
    • - Hyperglycemia (corrected Na = Na + 1.6×[(glu-100)/100])
    • - Mannitol
    • LOW Osm (<280) = TRUE HYPONATREMIA
    • - Proceed with workup
  5. 05Decision

    Assess Volume Status

    Key to etiology and treatment

    • HYPOVOLEMIC: Dry mucosa, tachycardia, orthostatic
    • EUVOLEMIC: No edema, no signs of dehydration
    • HYPERVOLEMIC: Edema, JVD, ascites
  6. 06Action

    Hypovolemic Hyponatremia

    Na+ and water loss, more Na+ than water

    • CAUSES:
    • - GI losses (vomiting, diarrhea)
    • - Diuretics
    • - Adrenal insufficiency
    • - Salt-wasting nephropathy
    • LABS: UNa usually <20 (renal conserving)
    • TREATMENT:
    • - Normal saline (0.9% NS)
    • - Treat underlying cause
    • - Hold diuretics
  7. 07Warning

    CRITICAL: Correction Limits

    Avoid osmotic demyelination syndrome

    • MAX CORRECTION:
    • - 8-10 mEq/L in first 24 hours
    • - 8 mEq/L per 24h thereafter
    • HIGH RISK FOR ODS:
    • - Na+ <105 mEq/L
    • - Hypokalemia
    • - Alcoholism, malnutrition
    • - Liver disease
    • IF OVERCORRECTING:
    • - Stop hypertonic/NS
    • - Give D5W
    • - Consider desmopressin (DDAVP)
  8. 08Action

    Monitoring

    Frequent reassessment

    • SEVERE: Na+ q2h until stable
    • MODERATE: Na+ q4-6h
    • MILD: Na+ q12-24h
    • Adjust treatment based on response
    • Watch for overcorrection
    • Check K+ (often low too)
  9. 09Outcome

    Goals

    Safe correction

    • Treat symptoms first
    • Correct slowly (8-10 mEq/24h max)
    • Address underlying cause
    • Avoid ODS
    • Target Na+ >130 mEq/L
  10. 10Action

    Euvolemic Hyponatremia

    Most common inpatient

    • CAUSES:
    • - SIADH (most common)
    • - Hypothyroidism
    • - Adrenal insufficiency
    • - Primary polydipsia
    • - Reset osmostat
    • SIADH CRITERIA:
    • - Euvolemic, Serum Osm <280
    • - Urine Osm >100, UNa >40
    • - Normal thyroid/adrenal
    • TREATMENT:
    • - Fluid restriction (800-1500 mL/day)
    • - Salt tablets ± loop diuretic
    • - Tolvaptan (if refractory)
  11. Path rejoins step 07Shared downstream outcome
  12. 11Action

    Hypervolemic Hyponatremia

    Total body water excess

    • CAUSES:
    • - CHF
    • - Cirrhosis
    • - Nephrotic syndrome
    • - Kidney failure
    • LABS: UNa usually <20
    • TREATMENT:
    • - Fluid AND sodium restriction
    • - Diuretics (loop)
    • - Treat underlying condition
    • - Vaptans in select cases (CHF)
  13. Path rejoins step 07Shared downstream outcome
  14. Path rejoins step 04Shared downstream outcome

Guideline Source

European Hyponatremia Guidelines + Clinical Consensus

DOI: N/A

Clinical Safety Information

Clinical Decision Support — Not a Substitute for Clinical Judgment

Individual patient factors may require deviation from these recommendations.

Known Limitations

  • Osmotic demyelination syndrome (ODS) with rapid correction
  • Volume status assessment challenging
  • Multiple etiologies may coexist
  • SIADH requires confirmation

Applicable Regions

USEU
Version 1Next review: 2027-01-11

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Frequently Asked Questions

What is the Acute Hyponatremia Management - Hospitalist?

The Acute Hyponatremia Management - Hospitalist is a emergency clinical algorithm for Internal Medicine. It provides a structured decision tree to guide clinical decision-making, based on European Hyponatremia Guidelines + Clinical Consensus.

What guideline is the Acute Hyponatremia Management - Hospitalist based on?

This algorithm is based on European Hyponatremia Guidelines + Clinical Consensus (DOI: N/A).

What are the limitations of the Acute Hyponatremia Management - Hospitalist?

Known limitations include: Osmotic demyelination syndrome (ODS) with rapid correction; Volume status assessment challenging; Multiple etiologies may coexist; SIADH requires confirmation. Individual patient factors may require deviation from these recommendations.

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