Hypovolemic Hyponatremia

Hypotonic hyponatremia with decreased ECF volume  (hypovolemic hyponatremia)

  • Deficit of both total body Na & water
    • Deficit of total body Na is greater than the deficit of total body water
  • Causes: diuretics, sweating, Vomit/Diarrhea, hypoadrenalism (low cortisol, low aldosterone), renal tubular acidosis, burns (third space losses)
  • Trxt: resolve the underlying cause, NS, (DON’T USE VAPTANS–CONTRAINDICATED W/ HYPOVOLEMICS)
    • Avoid increasing serum Na greater than 12 mEq/L in 24 hours

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