Concentration of sodium in Ringer lactate in (meq/L) is
**Core Concept**
Ringer lactate is a type of crystalloid solution used for fluid resuscitation and maintenance. It contains a balanced mixture of electrolytes, including sodium, chloride, potassium, calcium, and lactate. The concentration of sodium in Ringer lactate is crucial for maintaining proper fluid balance and preventing electrolyte imbalances.
**Why the Correct Answer is Right**
The correct concentration of sodium in Ringer lactate is 130 mEq/L. This is because Ringer lactate is designed to mimic the electrolyte composition of human plasma, with a sodium concentration that is slightly lower than normal plasma levels (135-145 mEq/L). The lower sodium concentration helps to prevent hypernatremia and maintain proper fluid balance. The lactate in Ringer lactate is metabolized to bicarbonate, which helps to maintain acid-base balance.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because the sodium concentration in Ringer lactate is not 140 mEq/L. While this is close to normal plasma levels, it is not the correct concentration for Ringer lactate.
**Option B:** Incorrect because the sodium concentration in Ringer lactate is not 120 mEq/L. This is too low and would lead to hyponatremia.
**Option C:** Incorrect because the sodium concentration in Ringer lactate is not 150 mEq/L. This is too high and would lead to hypernatremia.
**Clinical Pearl / High-Yield Fact**
Remember that Ringer lactate is a balanced electrolyte solution that is designed to mimic the composition of human plasma. It is commonly used for fluid resuscitation and maintenance, but it should be used cautiously in patients with electrolyte imbalances or acid-base disorders.
**Correct Answer: C. 130 mEq/L**