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Hyperacute hyponatremia mimicking acute ischemic stroke.

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Area of Science:

  • Neurology
  • Endocrinology

Background:

  • Acute hyponatremia is a critical condition that can manifest with neurological symptoms.
  • Distinguishing hyponatremia from acute ischemic stroke is crucial for appropriate management.

Observation:

  • A patient presented with acute neurological deficits, including confusion, facial droop, hemiparesis, dysarthria, and aphasia, scoring 5 on the NIH stroke scale.
  • Initial sodium levels were found to be 119 mmol/L, a significant drop from 138 mmol/L within seven hours.

Findings:

  • Neurological symptoms resolved rapidly following intravenous administration of 3% saline.
  • Cranial imaging revealed no evidence of stroke, intracranial hemorrhage, or space-occupying lesions.
  • The hyponatremia was attributed to excessive free water intake and a surge in antidiuretic hormone (ADH).

Implications:

  • Clinicians should consider acute hyponatremia in the differential diagnosis of stroke-like presentations.
  • Early assessment of serum sodium levels is vital in patients with acute focal neurological deficits.
  • Recognizing and treating hyponatremia can prevent unnecessary interventions for stroke.