A physician gives the following order: "Infuse LR, 500 mL over 2 hours."
At what rate should the nurse set the IV pump to deliver this infusion (mL/hr)?

100 mL/hr

250 mL/hr

500 mL/hr

1000 mL/hr

Answer and Explanation

The Correct Answer is B

To calculate the infusion rate in mL/hr, we need to divide the total volume to be infused by the time for infusion and convert the units appropriately.

First, we need to convert the time of infusion from hours to minutes, since most IV pumps use minutes as the time unit.

2 hours x 60 minutes/hour = 120 minutes Next, we can calculate the infusion rate:

500 mL ÷ 120 minutes = 4.17 mL/minute

To convert mL/minute to mL/hour, we multiply by 60:

4.17 mL/minute x 60 minutes/hour = 250 mL/hour

Therefore, the correct answer is B. 250 mL/hr. The nurse should set the IV pump to deliver the LR infusion at a rate of 250 mL/hr to infuse 500 mL over 2 hours.

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Correct Answer is D

Explanation

To calculate the amount of magnesium sulfate to be added to the normal saline, we can use the formula:

Concentration = Dose / Volume Plugging in the given values, we get:

Concentration = 2 g / 50 mL Simplifying, we get:

Concentration = 0.04 g/mL

To find the amount of magnesium sulfate needed for 1000 mL of normal saline, we can multiply the concentration by the volume:

Amount = Concentration × Volume Amount = 0.04 g/mL × 1000 mL Amount = 40 g

Therefore, 40 g of magnesium sulfate must be added to 1000 mL of normal saline to provide the ordered infusion.

A. 100 mL/hr B. 150 mL/hr C. 200 mL/hr D. 400 mL/hr

Correct Answer is C

Explanation

The patient is ordered to receive 0.15 mg/kg of Zofran over 15 minutes. The patient weighs 176 lb, which is equivalent to 80 kg. To calculate the total amount of Zofran the patient should receive, multiply the weight by the dosage:

80 kg x 0.15 mg/kg = 12 mg

The Zofran arrives from the pharmacy mixed in 50 mL of normal saline, which means there is 12 mg of Zofran in 50 mL of solution. To calculate how many milliliters per hour the nurse should set the IV pump, we can use the following formula:

50 mL / 0.25 hour = X mL per hour X = 200 mL per hour

Therefore, the nurse should set the IV pump to deliver 200 mL of Zofran per hour to the patient.

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A physician gives the following order: "Infuse LR, 500 mL over 2 hours." At what rate should the nurse set the IV pump to deliver this infusion (mL/hr)?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

A patient is to receive magnesium sulfate 2 grams per hour at 50 mL/hour rate of infusion. How much magnesium sulfate must be added to 1000 mL normal saline to provide the ordered infusion?

Correct Answer is D

Explanation

A nurse will administer Zofran (ondansetron) 0.15 mg/kg over 15 minutes. The patient weighs 176 lb. The nurse receives the medication from the pharmacy mixed in 50 mL normal saline... How should the nurse set the IV pump to deliver the correct dose?

Correct Answer is C

Explanation

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A physician gives the following order: "Infuse LR, 500 mL over 2 hours."
At what rate should the nurse set the IV pump to deliver this infusion (mL/hr)?