Sodium Chloride 3% Pediatric Dose — Hyponatremia
Sodium chloride 3% (hypertonic saline) is a concentrated electrolyte solution that rapidly raises serum sodium by increasing extracellular osmolality, driving water out of cells. It is indicated in the acute management of symptomatic hyponatremia — particularly when neurological manifestations such as seizures, altered consciousness, or cerebral edema are present. Its use in children is restricted to closely monitored ICU or ED settings due to the risk of rapid osmotic shifts.
Pediatric Dosing
- Dose: 4–6 mL/kg of sodium chloride 3% solution
- Route: Intravenous (IV)
- Infusion duration: Over 15–30 minutes
- Setting: ICU or ED only
Worked example: For a 20 kg child: 20 × 4 mL/kg = 80 mL to 20 × 6 mL/kg = 120 mL of sodium chloride 3%, infused over 15–30 minutes. Consult institutional protocol for repeat dosing guidance and serum sodium targets.
Indications and Clinical Context
Hypertonic saline is used for the acute, symptomatic phase of hyponatremia — defined by the presence of neurological symptoms including seizures, obtundation, or signs of raised intracranial pressure attributable to cerebral edema from hypo-osmolar states. This intervention is not indicated for asymptomatic or chronic hyponatremia, where overly rapid correction carries a risk of osmotic demyelination syndrome.
In the ICU or ED setting, the 4–6 mL/kg infusion is intended to rapidly raise serum sodium by approximately 3–5 mEq/L, sufficient to reduce acute cerebral swelling and terminate hyponatremic seizures. Ongoing correction should then proceed gradually under close monitoring, in accordance with current pediatric critical care and nephrology guidelines.
Administration and Monitoring
Sodium chloride 3% must be administered via a reliable IV line; central venous access is preferred given the hyperosmolar and potentially sclerosing nature of the solution, though peripheral access may be used in emergent situations. Infuse over 15–30 minutes as a controlled bolus — do not administer by rapid push. This intervention is restricted to the ICU or ED setting only.
- Monitor serum sodium closely during and after infusion (typically at 1–2 hour intervals initially).
- Avoid exceeding a correction rate of approximately 10–12 mEq/L per 24 hours to minimize osmotic demyelination risk.
- Monitor for volume overload, hypertension, and pulmonary edema, particularly in patients with impaired cardiac or renal function.
- Consult institutional protocol for repeat dosing, total correction targets, and transition to maintenance therapy.
Disclaimer: This article is an educational reference summarizing standard pediatric dosing values. It is not a substitute for clinical judgment. Always verify doses against institutional protocols, the current edition of authoritative references (e.g., Lexicomp, Harriet Lane Handbook, PALS guidelines), the patient’s accurate weight, and any patient-specific factors (renal/hepatic function, allergies, comedications) before administration.