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Hypermagnesemia

  • Criteria

    • Mg > 2.1
  • Sx

    • DTR disappears -> muscle weakness -?> hypotension -> respiratory arrest
  • Common causes

    • renal failure, lithium
  • Tx

    • if symptomatic: CaCl IV 5mL of 10% soln
    • NS and furosemide
  • Ddx

    • increased intake (urine Mg > 20)
      • oral MgSO4
      • Mg antacids
      • Mg enemas
      • Mg administration
    • decreased renal excretion
      • renal failure (Cr high)
      • lithium
      • hypothyroidism (TSH)
      • hypocalcemia
      • hypoaldosteronism
      • hypovolemia
    • redistribution
      • DKA

  • Print | Citations

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