Which complication can arise from overly rapid correction of sodium levels in a patient?

• A. Acute pancreatitis
• B. Central pontine myelinolysis
• C. Hepatic encephalopathy
• D. Pulmonary embolism

Answer: (B)

Overly rapid correction of sodium levels, especially in cases of hyponatremia, can lead to central pontine myelinolysis, also known as osmotic demyelination syndrome. This serious neurological condition arises when there is a rapid change in osmotic pressure in the brain, which can occur when sodium is corrected too quickly.

In hyponatremic patients, the brain cells adapt to the lower sodium environment by losing osmotic agents, like electrolytes and amino acids. If sodium levels are corrected too fast, the extracellular fluid becomes hypertonic compared to the intracellular fluid, leading to the dehydration of brain cells. This osmotic imbalance can cause damage to the myelin sheath, particularly in the pons, and can result in severe neurological deficits, including dysarthria, paralysis, and altered consciousness.

This complication highlights the need for careful monitoring and gradual correction of sodium levels in clinical settings, typically aiming for no more than an increase of 8 to 10 mEq/L over 24 hours to avoid such serious outcomes.