A nurse is caring for a client who is taking lithium and reports starting a new exercise program.
The nurse should assess the client for which of the following electrolyte imbalances?

Lithium can cause hyponatremia by increasing the secretion of antidiuretic hormone and reducing the renal clearance of sodium.

Strenuous exercise can also cause hyponatremia by increasing sweat loss and fluid intake. Therefore, a client who is taking lithium and starting a new exercise program is at risk of developing hyponatremia.

Choice A is wrong because hypomagnesemia is not a common side effect of lithium or exercise.

Choice B is wrong because hypocalcemia is not a common side effect of lithium or exercise.

Choice D is wrong because hypokalemia is not a common side effect of lithium or exercise.

However, lithium can interact with some diuretics that can cause hypokalemia, so the client should avoid taking these drugs without consulting their doctor. Normal ranges for electrolytes are:

Sodium: 135-145 mmol/L

Magnesium: 0.7-1.1 mmol/L

Calcium: 2.1-2.6 mmol/L

Potassium: 3.5-5.0 mmol/L

This will help reduce swelling and discomfort caused by the infiltration of fluid into the tissues. Elevating the extremity also promotes venous return and prevents further fluid accumulation.

Choice A is wrong because applying pressure to the IV site can increase the risk of tissue damage and infection.

Pressure can also obstruct blood flow and cause thrombophlebitis.

Choice C is wrong because slowing the infusion rate will not stop the infiltration of fluid into the tissues.

Slowing the infusion rate can also delay the delivery of medication or fluid to the client.

Choice D is wrong because flushing the IV catheter can worsen the infiltration of fluid into the tissues.

Flushing the IV catheter can also introduce air or bacteria into the bloodstream and cause complications.

Normal ranges for peripheral IV infusion are dependent on the type and volume of fluid, the size and location of the catheter, and the condition of the client. Generally, peripheral IV infusion rates should not exceed 100 mL/hr for adults and 60 mL/hr for children.