In Lithium therapy, which electrolyte should be monitored closely?

In Lithium therapy, which electrolyte should be monitored closely?

• A. Sodium
• B. Potassium
• C. Calcium
• D. Magnesium

Answer: (A)

Sodium balance dictates how lithium behaves in the body. Lithium is handled by the kidneys in a way that mirrors sodium reabsorption, so changes in serum sodium directly affect lithium levels. When sodium is low (hyponatremia), the kidneys reabsorb more sodium and also reabsorb more lithium, raising lithium levels and the risk of toxicity. When sodium is high or the body loses more sodium (through diuretics or dehydration), lithium is cleared faster, which can drop its level and reduce effectiveness. Because of this close link, monitoring sodium closely helps keep lithium therapeutic and safe. The other electrolytes aren’t as directly tied to lithium’s kidney handling, though they can be affected by overall treatment and health.

Sodium balance dictates how lithium behaves in the body. Lithium is handled by the kidneys in a way that mirrors sodium reabsorption, so changes in serum sodium directly affect lithium levels. When sodium is low (hyponatremia), the kidneys reabsorb more sodium and also reabsorb more lithium, raising lithium levels and the risk of toxicity. When sodium is high or the body loses more sodium (through diuretics or dehydration), lithium is cleared faster, which can drop its level and reduce effectiveness. Because of this close link, monitoring sodium closely helps keep lithium therapeutic and safe.

The other electrolytes aren’t as directly tied to lithium’s kidney handling, though they can be affected by overall treatment and health.