Osmotic Demyelination Syndrome Following Rapid Correction of Hyponatremia in a Young Woman: A Case Report and Review of Literature.

Osmotic demyelination syndrome (ODS) is a rare and devastating neurological condition linked with the rapid correction of serum hyponatremia. We present a case report of a young female patient who developed ODS following an aggressive correction of low serum sodium levels. ODS is characterized by demyelination in the central and extrapontine regions of the brain, resulting in disastrous outcomes. The pathophysiology involves disruption of the blood-brain barrier (BBB) due to a sudden rise in serum sodium, which leads to astrocyte dysfunction secondary to osmotic shift, leading to inflammation, brain edema, and finally demyelination. A rapid rise in the serum sodium levels can overwhelm the brain's adaptive capacity, ultimately leading to ODS. Our case emphasizes the importance of careful sodium correction; in our patient, the serum sodium levels were raised precipitously, beyond the recommended 8-10 mmol/L limit within its first 24 hours, leading to calamitous neurological consequences. Despite the management of this disastrous condition with plasmapheresis, the patient succumbed to complications. A review of the literature suggests that no definitive treatment of ODS exists; therefore, cautious monitoring and raising the serum sodium levels to prevent ODS is critical. Our case report also highlights the necessity of heedful management of hyponatremia to prevent permanent neurological injury.