In suspected lithium toxicity, what is an initial management step?

In suspected lithium toxicity, what is an initial management step?

• A. Increase fluids
• B. Restrict fluids
• C. Decrease salt intake
• D. Administer diuretics

Answer: (A)

Initial management hinges on correcting volume status to enhance renal lithium clearance. Lithium is handled by the kidneys, and its reabsorption in the proximal tubule increases when a person is dehydrated or has low sodium delivery to the tubules. Increasing fluids—usually with isotonic saline—restores circulating volume, improves kidney perfusion, and raises sodium delivery to the tubule, which reduces lithium reabsorption and accelerates its excretion. This helps lower serum lithium levels and mitigate toxicity. Restricting fluids would worsen dehydration and promote more lithium retention; decreasing salt intake lowers sodium delivery and drives even more lithium reabsorption; diuretics can cause further volume depletion and can raise lithium levels. In severe cases, dialysis may be needed, but rehydration is the first priority.

Initial management hinges on correcting volume status to enhance renal lithium clearance. Lithium is handled by the kidneys, and its reabsorption in the proximal tubule increases when a person is dehydrated or has low sodium delivery to the tubules. Increasing fluids—usually with isotonic saline—restores circulating volume, improves kidney perfusion, and raises sodium delivery to the tubule, which reduces lithium reabsorption and accelerates its excretion. This helps lower serum lithium levels and mitigate toxicity. Restricting fluids would worsen dehydration and promote more lithium retention; decreasing salt intake lowers sodium delivery and drives even more lithium reabsorption; diuretics can cause further volume depletion and can raise lithium levels. In severe cases, dialysis may be needed, but rehydration is the first priority.