Treatment for cerebral salt wasting includes volume replacement with what, and why should correction be slow?

Treatment for cerebral salt wasting includes volume replacement with what, and why should correction be slow?

• A. Hypertonic saline only; rapid correction reduces edema
• B. Isotonic saline only; no risk of rapid correction
• C. Normal to hypertonic saline; to avoid central pontine myelinolysis from overly rapid correction
• D. Diuretics to reduce sodium load; rapid correction is not a concern

Answer: (C)

In cerebral salt wasting, hyponatremia occurs with volume depletion from renal salt loss, so the treatment focus is restoring circulating volume and sodium with saline. Using normal (isotonic) saline is typical to replenish the extracellular space, and hypertonic saline can be considered if the hyponatremia is severe or there are significant neurologic signs. The crucial point is to correct the sodium slowly. Rapid correction of sodium can trigger osmotic demyelination syndrome, most famously central pontine myelinolysis, which can cause severe, irreversible neurologic damage. Therefore, the goal is gradual normalization of sodium with careful monitoring, rather than a fast fix. Diuretics would worsen the sodium and volume status and are not appropriate as primary therapy in this context.

In cerebral salt wasting, hyponatremia occurs with volume depletion from renal salt loss, so the treatment focus is restoring circulating volume and sodium with saline. Using normal (isotonic) saline is typical to replenish the extracellular space, and hypertonic saline can be considered if the hyponatremia is severe or there are significant neurologic signs. The crucial point is to correct the sodium slowly. Rapid correction of sodium can trigger osmotic demyelination syndrome, most famously central pontine myelinolysis, which can cause severe, irreversible neurologic damage. Therefore, the goal is gradual normalization of sodium with careful monitoring, rather than a fast fix. Diuretics would worsen the sodium and volume status and are not appropriate as primary therapy in this context.