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Discussion

med calc help

Hi there, well its been a while since doing med calcs and would love to get some assistance with these two drug calcs please. If you dont use it you lose it. Appreciate your help, thanks;)

Mrs Rogers has had a CABG and is commenced on IVI Fentanyl

Order states to administer a bolus dose of 50mcgs Fentanyl IV diluted to 10ml in Normal Saline. Available 100mcgs/1ml. How many mls of Fentanyl will you draw up?

The Fentanyl infusion order states to dilute 500mcgs of Fentanyl in 50ml of Normal Saline for injection. Calculate the concentration (mcg/ml) of Fentanyl in Syringe.

The Fentanyl is commenced at a rate of 20mcg/hr. At what rate (ml/hr) will you set infusion pump to?

After 3 hours the patient states they have a pain score of 7/10. Order states that you can adjust rate between 20mcg - 80mcg/hr. You decide to increase the rate to 40mcg/hr and ask another RN to check your rate change. At what rate will you be setting the pump to?

_____________________

A patient has a Morphine infusion running at 4mg/hr . The additive label on the infusion reads:

Drug: Morphine

Dose: 25mg

Made up to 50ml with Normal Saline

What is the concentration of the infusion ( mg/ml)

How many ml/hr is the infusion running at?

The patients pain has decreased so the doctor orders to run the infusion at 6ml/hr

How many mg/hr is patient now receiving?

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I will not do these for you because I feel as an RN you should be able to do them; however I will tell you to think about the information:

What you have: How many Mcg per ML

What you need to give: How many mcg in bolus or per hour.

Swtooth

  • Author

Thanks Sawtooth.

Well I have worked on all the Fentanyl and most of the Morphine. The last question of morphine i am stumped, trying to figure out what I do to reduce the rate?

i dont think I have come across a formula for this?

Thanks

You should be able to do these without a formula since the numbers are so small.

Morphine is 25 mg per 50 ml. That is 1 mg per 2 ml.

if you want a 4 mg/hour dose, you will run it at 8ml/hr

If you decrease to 6 ml /hr you will be giving 3 mg of morphine/hr.

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