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3 per cent ns dose pediatrics

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Here is a concise, evidence-based summary of 3% Normal Saline (hypertonic saline) dosing in pediatrics:

3% NaCl (Hypertonic Saline) — Pediatric Dosing

1. Symptomatic Hyponatremia / Hyponatremic Seizures

RouteDoseRate
IV bolus2–5 mL/kg (up to 150 mL/dose)Over 20 minutes
Goal: raise serum sodium by ~5 mEq/L to stop seizure activity; do not correct too rapidly (risk of osmotic demyelination if chronic). — Rosen's Emergency Medicine, Table 88-4

2. Raised Intracranial Pressure (ICP) / Pediatric TBI

Bolus dosing:
  • 2–5 mL/kg IV over 10–20 minutes
  • Repeat doses can be given as needed
Continuous infusion:
  • 0.1–1.0 mL/kg/h on a sliding scale titrated to ICP response (Level II evidence, Pediatric TBI Guidelines 2019)
Monitoring targets:
  • Serum osmolality < 320 mOsm/L
  • Sustained serum sodium < 160 mEq/L
— Miller's Anesthesia 10e, p. 11399; Mulholland & Greenfield's Surgery 7e, p. 1453

Key Points

  • 3% saline is the preferred hyperosmolar agent in pediatric TBI (Grade II evidence, 2019 guidelines), as sodium does not cross the blood–brain barrier rapidly, creating an osmotic gradient similar to mannitol.
  • Additional benefits: enhances cardiac output, reduces inflammation, restores normal cellular resting membrane potential.
  • For ICP management, mannitol (0.25–1 g/kg IV bolus) remains an alternative.
  • Always monitor serum Na⁺ and osmolality closely.
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