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
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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
The patient is ordered to receive 0.3 mg/kg of Nubain IV over 10 minutes. The patient weighs 148 lb, which is equivalent to 67.3 kg. To calculate the total amount of Nubain the patient should receive, multiply the weight by the dosage:
67.3 kg x 0.3 mg/kg = 20.19 mg
The Nubain is available in 10 mg/mL, which means there is 10 mg of Nubain in 1 mL of solution. To calculate how many milliliters of Nubain the patient should receive, divide the total amount of Nubain by the concentration:
20.19 mg / 10 mg per mL = 2.019 mL
To calculate how many milliliters per minute the nurse should administer, divide the total volume of Nubain by the infusion time:
2.019 mL / 10 minutes = 0.2019 mL per minute
Rounding to one decimal place, the nurse should administer 0.2 mL of Nubain per minute to the patient.
Correct Answer is B
Explanation
The correct answer is choice B, 64 mL. To determine the amount of Fosamax the nurse should administer, we use the formula: (dose ordered ÷ dose available) x volume available. Substituting the given values, we get: (60 ÷ 70) x 75 = 64.28 mL, rounded to 64 mL.
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