In managing severe chronic symptomatic hyponatremia, what is the maximum recommended rise in serum sodium over 24 hours to prevent osmotic demyelination syndrome?
Answer and explanation
Correct answer: C. 8 to 10 mEq/L in 24 hours
- Step 1: Brain cells adapt to chronic hyponatremia by extruding intracellular organic osmolytes to prevent cerebral edema.
- Step 2: Overly rapid correction of serum sodium draws water out of brain cells, risking fatal central pontine myelinolysis; current guidelines recommend limiting correction to no more than 8 to 10 mEq/L per 24 hours.
Answer
8 to 10 mEq/L in 24 hours.
Why not the others: A rate of 20 to 25 mEq/L per 24 hours dramatically increases the risk of irreversible pontine myelinolysis. A rate of 30 to 35 mEq/L per 24 hours is dangerous and causes catastrophic neurological damage. A correction of 15 to 18 mEq/L per 24 hours exceeds safe clinical thresholds.
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