med problems!

[YummyMummyRN]

Hey Y'all!! I hope you can help -- I need a step by step explaination to acheive the answers. It shouldn't be as difficult as I'm making it seem.

THANKS ALL!! (:

1) A new medication, Z, comes as a powder which must be reconstituted as follows: IV use: Add 24ml of sterile water for injection. Each 2.5ml of resulting solution contains 500mg of Z. How many ml must be injected into a 100ml IV bag of NS to equal 1.5g of Z?

2) Procainamide drip is ordered for 2mg/min. The standard mixture of procainamide is 2g in 500ml. At how many ml/hr should the IV pump be set?

3) A unit of packed cells (approx 240ml) is to be administered over 4 hours. The blood tubing has a drop factor of 10 gtt/ml. Calculate the drip rate in gtt/min in order to administer the blood over 4 hours.

4) Physician orders a Heparin Bolus of 5,000 units IV followed by a Heparin drip at 1,000 units per hour. The standard mixture of Heparin in 25,000 units/ 500 D5W. How many ml/hr should the pump be set to administer the Heparin drip?

[mpccrn, BSN, RN]

1. 4.5 ml = 1.5 g

2. 30ml/hr

3. forgot drip calcs a looong time ago. i'd set the pump at 60cc/hr

4. 20ml/hr

[CoffeeRTC, BSN, RN]

srsly...is this home work? A lot of people will be thinking the same.

Give us what you have already and then we can help. What are you thinking are the answers/ rational?

[iteachob, MSN, RN]

Here's the correct answer to #3 (answer above is incorrect), using Dimensional analysis

gtt 10 gtt 240 mL 1 hr 2400 2400/240 = 10

= X X =

min l mL 4 hrs 60 min 240

I can't adequately explain Dimensional analysis in this forum, but it is the BEST method of drug calculation to be found! You can use it on literally any calculation. You should be able to find out how to do it (it has a few simple rules that MUST be followed) in most nursing pharmacology textbooks. There is also a medication calculation book (by Curren) that is entirely devoted to dimensional analysis.

Well.....I just saw the way it posts and it doesn't make much sense......I thought it might look okay since it was in HTML guess not. Still....the correct answer to #3 is 10 gtts/min.

[stefano]

hello! can someone show me how to solve number 1?

i got everything correct except for the first one..

i**** at math!lol

[miko014]

1. 4.5 ml = 1.5 g

2. 30ml/hr

3. forgot drip calcs a looong time ago. i'd set the pump at 60cc/hr

4. 20ml/hr

I don't like doing other people's homework when they aren't upfront about the fact that it is hw. But ... how did you come up with 4.5ml? If 2.5 ml = 500mg, then you would have to multiply the 2.5ml x 3 (because 500mg x 3 = 1500mg or 1.5g) and you would come up with 7.5 ml, not 4.5. Unless there is something that I missed...

Stefano, there's a lot of info there that you don't need. It doesn't matter that it takes 24ml to reconsititue, and it doesn't matter that it's going into 100 ml. All you need is the fact that 2.5 ml = 500 mg. You need 1.5 g, which you know is equal to 1500 mg. That's all you need to set up your problem.

[iteachob, MSN, RN]

I don't like doing other people's homework when they aren't upfront about the fact that it is hw. But ... how did you come up with 4.5ml? If 2.5 ml = 500mg, then you would have to multiply the 2.5ml x 3 (because 500mg x 3 = 1500mg or 1.5g) and you would come up with 7.5 ml, not 4.5. Unless there is something that I missed...

Stefano, there's a lot of info there that you don't need. It doesn't matter that it takes 24ml to reconsititue, and it doesn't matter that it's going into 100 ml. All you need is the fact that 2.5 ml = 500 mg. You need 1.5 g, which you know is equal to 1500 mg. That's all you need to set up your problem.

You're correct....it is 7.5 mL (not 4.5)

[miko014]

You're correct....it is 7.5 mL (not 4.5)

Haha, I thought so! I was like wait, is this one that's so easy that it's hard??? Thanks. :nuke: