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50 grams of Magnesium sulfate is added to 1L of Lactated Ringers.
After giving an initial loading dose, the nurse is to infuse a maintenance dose of 2 gm/hr. What rate should the IV pump be set at?

A.

10 mL/hr

B.

20 mL/hr

C.

30 mL/hr

D.

40 mL/hr

Answer and Explanation

The Correct Answer is D

Step 1 is to calculate the total amount of Magnesium sulfate in the solution. This is done by multiplying the amount of Magnesium sulfate per mL (which is 50g/L or 0.05g/mL) by the total volume of the solution (which is 1000mL). So, 0.05g/mL × 1000mL = 50g. 
Step 2 is to calculate the rate of the IV pump. The maintenance dose is 2g/hr. So, if there are 50g in 1000mL, then 2g would be in (2g ÷ 50g) × 1000mL = 40mL. Therefore, the IV pump should be set at 40 mL/hr. 
 


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Related Questions

Correct Answer is D

Explanation

Choice A rationale
Abdominal pain accompanied by minimal red vaginal bleeding is not a typical symptom of placenta previa. In placenta previa, the placenta covers all or part of the cervix, which can cause severe bleeding. However, this bleeding is typically not associated with abdominal pain.
Choice B rationale
Intermittent abdominal pain following the passage of bloody mucus is not a common symptom of placenta previa. This symptom is more commonly associated with labor or other conditions, but not specifically with placenta previa.
Choice C rationale
Increasing abdominal pain with a nonrelaxed uterus is not a typical symptom of placenta previa. This could be a sign of other complications such as uterine rupture or placental abruption, which are serious conditions that require immediate medical attention.
Choice D rationale
Painless red vaginal bleeding is indeed a symptom of placenta previa. This bleeding is usually bright red and can occur intermittently or continuously. It is most common in the third trimester of pregnancy.

Correct Answer is A

Explanation

Choice A rationale
The maternal serum alpha-fetoprotein (MSAFP) test is a screening test that measures the level of alpha-fetoprotein in the mother’s blood during pregnancy. It is used to assess the likelihood of certain birth defects, including neural tube defects such as spina bifida.
Choice B rationale
The MSAFP test does not assess fetal lung maturity. Other tests, such as amniocentesis, can be used to assess this.
Choice C rationale
The MSAFP test does not identify Rh incompatibility between the mother and fetus. Rh incompatibility is typically determined through blood typing and antibody screening.
Choice D rationale
While the MSAFP test can provide valuable information about the health of the fetus, it does not assess various markers of fetal well-being. It is specifically used to screen for certain birth defects.

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