What is the initial treatment for hypovolemic hyponatremia?

What is the initial treatment for hypovolemic hyponatremia?

• A. Normal saline to correct volume and suppress ADH release
• B. Hypertonic saline
• C. Fluid restriction
• D. Diuretics

Answer: (A)

When volume is depleted, the body lowers effective arterial blood volume and releases ADH, which increases water reabsorption and dilutes serum sodium. The best initial treatment is isotonic saline (normal saline) to restore intravascular volume, improve perfusion, and suppress ADH. As volume status improves, ADH decreases, and the kidneys can excrete free water, allowing serum sodium to rise gradually. Hypertonic saline is reserved for severe, life‑threatening symptoms like seizures or coma, not routine initial management of hypovolemic hyponatremia. Fluid restriction won’t help here because the problem is volume depletion, and diuretics would worsen the volume deficit and hyponatremia.

When volume is depleted, the body lowers effective arterial blood volume and releases ADH, which increases water reabsorption and dilutes serum sodium. The best initial treatment is isotonic saline (normal saline) to restore intravascular volume, improve perfusion, and suppress ADH. As volume status improves, ADH decreases, and the kidneys can excrete free water, allowing serum sodium to rise gradually.

Hypertonic saline is reserved for severe, life‑threatening symptoms like seizures or coma, not routine initial management of hypovolemic hyponatremia. Fluid restriction won’t help here because the problem is volume depletion, and diuretics would worsen the volume deficit and hyponatremia.