Discontinuation of 3% Normal Saline in Severe Symptomatic Hyponatremia
Decision Algorithm for Discontinuing 3% Saline
- The American Academy of Neurology recommends discontinuing 3% normal saline when severe symptoms resolve, at which point the treatment should transition to protocols for mild symptoms or asymptomatic hyponatremia 1, 2, 3
- Resolution of severe symptoms is a key criterion for discontinuation, as recommended by the Neurosurgery society 1, 3
Transition After Discontinuation
- After severe symptoms resolve, switch to mild symptom protocol or asymptomatic protocol, as suggested by the Neurosurgery society 2, 3
- Continue monitoring serum sodium levels every 4 hours instead of every 2 hours, as recommended by the Neurosurgery society 3
- Implement fluid restriction to 1L/day, as recommended by the clinical guidelines 3, 4
Safety Parameters During Correction
- Do not exceed 8 mmol/L in 24 hours, as recommended by the clinical guidelines 3, 4, 5
- Initial correction goal: 6 mmol/L over 6 hours or until severe symptoms resolve, as recommended by the Neurosurgery society 3, 4
- After initial 6 mmol/L correction, limit to only 2 mmol/L in the following 18 hours, as recommended by the Neurosurgery society 3
Special Considerations
- Rapid correction (>1 mmol/L/h) should only be used for severely symptomatic and/or acute hyponatremia (≤48 hours), as recommended by the Neurosurgery society 1, 5
- For chronic hyponatremia (>48-72 hours), slower correction is safer after initial symptom control, although the specific guideline society is not specified 1, 5