Which is the initial treatment for severe hyponatremia?

Which is the initial treatment for severe hyponatremia?

• A. Desmopressin alone
• B. Fluid restriction
• C. 0.9% saline
• D. 3% NaCl

Answer: (D)

Severe hyponatremia with neurologic symptoms is an emergency because brain swelling can lead to seizures, coma, or herniation. The initial treatment should rapidly raise the serum sodium using hypertonic saline, specifically 3% NaCl. A typical approach is to give a 100 mL bolus of 3% NaCl over 10 minutes and repeat up to two more times if symptoms persist, aiming for an overall increase of about 4–6 mEq/L in the first few hours. After this, adjust the treatment to maintain a safe correction rate, with close monitoring of sodium every 2–4 hours to avoid overcorrection, which can cause osmotic demyelination. Desmopressin alone doesn’t treat the hyponatremia itself, though it can be used to prevent overly rapid correction in some cases. Fluid restriction is not the immediate fix in a severely symptomatic patient, and isotonic saline is often insufficient for rapid correction and may not adequately address cerebral edema in this setting.

Severe hyponatremia with neurologic symptoms is an emergency because brain swelling can lead to seizures, coma, or herniation. The initial treatment should rapidly raise the serum sodium using hypertonic saline, specifically 3% NaCl. A typical approach is to give a 100 mL bolus of 3% NaCl over 10 minutes and repeat up to two more times if symptoms persist, aiming for an overall increase of about 4–6 mEq/L in the first few hours. After this, adjust the treatment to maintain a safe correction rate, with close monitoring of sodium every 2–4 hours to avoid overcorrection, which can cause osmotic demyelination. Desmopressin alone doesn’t treat the hyponatremia itself, though it can be used to prevent overly rapid correction in some cases. Fluid restriction is not the immediate fix in a severely symptomatic patient, and isotonic saline is often insufficient for rapid correction and may not adequately address cerebral edema in this setting.