A nurse is preparing to administer dobutamine 12 mcg/kg/min by continuous IV infusion to a preterm newborn who weighs 2 kg. Available is dobutamine 250 mg in 500 mL dextrose 5% in water. The nurse should set the IV pump to deliver how many mL/hr?
(Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
The Correct Answer is ["2.9"]
Let’s calculate the IV pump rate for administering dobutamine to a preterm newborn.
Step 1 is to convert the dose from mcg/kg/min to mg/kg/min. We know that 1 mg = 1000 mcg, so we have:
12 mcg/kg/min ÷ 1000 = 0.012 mg/kg/min
Step 2 is to calculate the total amount of dobutamine the newborn needs per minute:
0.012 mg/kg/min × 2 kg = 0.024 mg/min
Step 3 is to convert this to an hourly rate:
0.024 mg/min × 60 min/hr = 1.44 mg/hr
Step 4 is to calculate the volume of the solution that contains this amount of dobutamine. We know that 250 mg of dobutamine is dissolved in 500 mL of solution, so:
(1.44 mg/hr ÷ 250 mg) × 500 mL = 2.88 mL/hr
So, the nurse should set the IV pump to deliver approximately 2.9 mL/hr (rounded to the nearest tenth).
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["2"]
Explanation
Volume (mL) = Dose (mcg) / Concentration (mcg/mL) Volume (mL) = 100 mcg / 50 mcg/mL
Volume (mL) = 2 mL
Therefore, the nurse should administer 2 mL of fentanyl injection 0.05 mg/mL to the client
Correct Answer is ["45"]
Explanation
Pump rate in mL/hour = Dose (mcg/kg/min) x Weight (kg) x 60 / Concentration (mcg/mL)
The concentration of nitroprusside is given as 50 mg in 250 mL of dextrose 5% in water.
Convert this to mcg/mL; multiply by 1000
Concentration (mcg/mL) = 50 mg x 1000 / 250 mL = 200 mcg/mL Therefore;
Pump rate in mL/hour = 2 mcg/kg/min x 75 kg x 60 / 200 mcg/mL Pump rate in mL/hour = 45 mL/hour
Therefore, the nurse should set the IV pump to deliver 45 mL/hour
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