Hyponatremia due to excess ADH is best described as?

Hyponatremia due to excess ADH is best described as?

• A. Pseudohyponatremia
• B. Dilutional hyponatremia from water retention
• C. Hypernatremia due to dehydration
• D. Sodium overload

Answer: (B)

Excess ADH causes the kidneys to reabsorb more water, increasing total body water without a corresponding rise in sodium. This dilutes the serum sodium concentration, producing dilutional hyponatremia from water retention. It’s a euvolemic form seen in SIADH, not a lab artifact or dehydration-related hypernatremia, and not sodium overload. Management focuses on limiting fluid intake and addressing the underlying cause, with careful correction to avoid rapid shifts in sodium.

Excess ADH causes the kidneys to reabsorb more water, increasing total body water without a corresponding rise in sodium. This dilutes the serum sodium concentration, producing dilutional hyponatremia from water retention. It’s a euvolemic form seen in SIADH, not a lab artifact or dehydration-related hypernatremia, and not sodium overload. Management focuses on limiting fluid intake and addressing the underlying cause, with careful correction to avoid rapid shifts in sodium.