Administration rate in mL/hr

[Arewa]

Pls help with this calculation.......
A pharmacist receives an order for a medication to be administered IV at a rate of 40mg/kg/min.If 10ml of a 20% solution of the drug is added to 490mL of D5W,what is the correct administration rate in mL/hr for a patient weighing 180 pounds?

Thank you

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[browneyes021]

3272 mg/min (40 mg/kg x 180lbs/2.2)

500 ml (490 D5W + 10 ml of 20% soln)

500 ml x 3272 mg x 60 min
_____ ________ ________
y mg 1 min 1 hr

20 g = a
_____ _____
100 ml 10 ml

5 g = b
_____ ______
100 ml 490 ml

a + b = y grams

change grams to mg

I didn't actually work to get the answer, but let me know if that's the correct way to get it.

 

[Arewa]

Your steps are correct….. You should get the same answer as I did below

180/2.2 * 40mg/kg/min = 3272mg/min

20g/100ml (20%) x10ml= 2g (2g/500ml= 4mg/ml)

3,272mg/min x60 =49,080ml/hr
4mg/ml

This is the steps I followed but the answer just looks out of the real world
Thank you.

 

[CaymanRx]

I see that u posted that problem on the other form website too. I got the same answer but I, too thought it was odd so I didn't post it. I think we solved it right but the numbers are not real.