Management of Serum Sodium Levels with D5W

Mechanism of Action and Fluid Characteristics

The solution D5W contains no sodium (0 mEq/L) compared to normal plasma sodium of 135-145 mEq/L, and its administration can dilute serum sodium concentration, according to the American Academy of Pediatrics 1, 2

D5W is recommended as the primary fluid for free water replacement in patients with hypernatremia by clinical guidelines 3
When hyponatremia has been overcorrected too rapidly (>8 mmol/L in 24 hours), immediately switching to D5W can relower sodium levels to prevent osmotic demyelination syndrome, as suggested by clinical guidelines 3
In nephrogenic diabetes insipidus (NDI), D5W matches the hypotonic urinary losses and is appropriate for fluid replacement, according to the National Institute of Diabetes and Digestive and Kidney Diseases 4, 5

The rate of sodium correction should not exceed 8 mmol/L in 24 hours to prevent osmotic demyelination syndrome, as recommended by the National Institute of Diabetes and Digestive and Kidney Diseases and clinical guidelines 3, 4, 5
D5W should be given via controlled infusion with frequent sodium monitoring, according to the National Institute of Diabetes and Digestive and Kidney Diseases 4, 5

Normal saline (0.9% NaCl) has 154 mEq/L sodium and an osmolarity of 308 mOsm/L, whereas D5W is a hypotonic solution with an osmolarity of approximately 252 mOsm/L, as described by the American Academy of Pediatrics 1, 2

Monitor serum sodium levels every 2-4 hours during active correction with D5W, as recommended by clinical guidelines 3
Track neurological status closely when using D5W to lower serum sodium, according to the National Institute of Diabetes and Digestive and Kidney Diseases 4, 5