A client who has pre-eclampsia receives a prescription for an IV infusion of 0.9% normal saline with magnesium sulfate 4 gram/250 ml to be infused at a rate of 125 ml/hour. The nurse should administer how many mg/hour of magnesium sulfate? (Enter numeric value only. If rounding is required, round to the nearest whole number.)
The Correct Answer is ["2000"]
To calculate the infusion rate of magnesium sulfate, we'll follow these steps:
1. Calculate the concentration of magnesium sulfate in the IV solution:
Magnesium Sulfate Concentration = Magnesium Sulfate (g) / Solution Volume (mL)
Magnesium Sulfate Concentration = 4 grams / 250 mL
Magnesium Sulfate Concentration = 16 mg/mL
2. Calculate the magnesium sulfate infusion rate in mg/hour:
Magnesium Sulfate Infusion Rate = Infusion Rate (mL/hour) x Magnesium Sulfate Concentration (mg/mL)
Magnesium Sulfate Infusion Rate = 125 mL/hour x 16 mg/mL
Magnesium Sulfate Infusion Rate = 2000 mg/hour
Therefore, the nurse should administer 2000 mg/hour of magnesium sulfate.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["1.5"]
Explanation
Calculating the Alprazolam Dose
Problem: Administer 0.75 mg of alprazolam PO. The available concentration is 0.5 mg/tablet.
Steps:
Set up a proportion:
We want to find the number of tablets needed.
We know the desired dose (0.75 mg) and the concentration of the medication (0.5 mg/tablet).
Proportion:
x tablets / 0.75 mg = 1 tablet / 0.5 mg
Cross-multiply:
0.5x = 0.75
Solve for x:
x = 0.75 / 0.5
x = 1.5
Answer: The nurse should administer 1.5 tablets of alprazolam per dose.
Correct Answer is ["499"]
Explanation
Calculating the Lactated Ringer's Infusion Rate
Step 1: Convert pounds to kilograms:
110 pounds x (1 kg / 2.20462 pounds) ≈ 49.9 kg
Step 2: Calculate the total fluid requirement for 24 hours using the Parkland formula:
Total Fluid (mL) = 4 mL/kg/%TBSA x Body Weight (kg) x %TBSA
Total Fluid = 4 mL/kg/%TBSA x 49.9 kg x 40%
Total Fluid = 7984 mL
Step 3: Calculate the fluid volume for the first 8 hours:
First 8 Hours Fluid = Total Fluid / 2
First 8 Hours Fluid = 7984 mL / 2
First 8 Hours Fluid = 3992 mL
Step 4: Calculate the infusion rate for the first 8 hours:
Infusion Rate (mL/hour) = First 8 Hours Fluid / 8 hours
Infusion Rate = 3992 mL / 8 hours
Infusion Rate ≈ 499 mL/hour
Therefore, the nurse should set the infusion pump to deliver approximately 499 mL/hour during the first 8 hours.
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