A client’s Sodium level is 128 meq/L. The nurse knows that a likely cause of this lab finding is:
A.
Deficient intake of protein.
B.
Administration of hypotonic IV fluids.
C.
Excessive dietary intake of salt.
D.
Overdose of supplemental Potassium pills.
The Correct answer and Explanation is:
The correct answer is B. Administration of hypotonic IV fluids.
A sodium level of 128 mEq/L indicates hyponatremia, which refers to a condition where the sodium level in the blood is below the normal range (135-145 mEq/L). Sodium is a crucial electrolyte that helps regulate water balance, nerve function, and muscle contractions. Hyponatremia can be caused by several factors, but one of the common causes is the administration of hypotonic IV fluids.
Explanation:
- Hypotonic IV fluids and Sodium Dilution: Hypotonic IV fluids have a lower concentration of solutes (like sodium) than the blood. When these fluids are administered, they cause water to move into the cells, diluting the sodium concentration in the extracellular space (the blood). This dilution effect leads to hyponatremia because the sodium becomes less concentrated relative to the total body water. Common hypotonic solutions include 0.45% saline (half-normal saline) or dextrose 5% in water (D5W). These fluids are often used to treat dehydration, but in excess or for inappropriate reasons, they can lead to an electrolyte imbalance like hyponatremia.
- Other Causes Excluded:
- A. Deficient intake of protein: While poor nutrition can lead to various imbalances, a lack of protein does not directly cause hyponatremia. Low protein intake is more related to conditions like hypoalbuminemia (low albumin), which impacts fluid balance but doesn’t cause direct sodium loss.
- C. Excessive dietary intake of salt: This would raise sodium levels, potentially causing hypernatremia (high sodium levels) instead of low sodium levels.
- D. Overdose of supplemental Potassium pills: Potassium and sodium have an inverse relationship, but an overdose of potassium does not typically cause hyponatremia. Instead, it leads to hyperkalemia (high potassium levels).
In conclusion, hyponatremia in this case is most likely due to the administration of hypotonic fluids, which dilute the sodium concentration in the blood. Monitoring IV fluid administration and adjusting treatment is essential to prevent and manage such imbalances.