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Discussion

Math calc question

Hi there!

I have a math question I am struggling with, was hoping someone could help!

Dopamine 400mg in 250ml of D5W to infuse at 5mcg/kg/min. The patients weight is 200 lbs. How many ml/hr would be on an infusion pump?

This is what I did to solve it:

200lbs divided by 2.2lbs/kg = 90.9kg > 91kg

5mcg/kg/min x 91kg = 455mcg/min

455mcg/min x 60min/1hr= 27,300mcg/hr

27,300mcg x 1mg/1000mcg = 27.3 mg/hr

27.3 mg x 250ml/400mg = 17ml/hr

So my answer is I would infuse at 17ml/hr

Anyone get the same? Thanks in advance!

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    This is how I solved it!

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    • Author

    thank you for the quick response!

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    Yes, and thank you for working the problem rather than posting the question and hoping for the answer.

    The formula I use for this type problem (weight based, per minute) is: (dose × weight × 60) ÷ conc/mL.

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