IV Calculations PLEASE HELP!

[GARYLPN]

Can anyone can help with IV med problems???? If so THANKS!!!!

Example:

Heparin 20,000u in 500cc of NS

to run at 1,000 units/hr. What rate will you set your pump?

Order reads: run at 50cc/hour How many units Heparin/hour?

Another example:

A child 9 years old, 75 pounds

Cefazolin 750 mg IV Q 8 hours

Medication supplied from Pharmacy in 1000 mg Vials

Do these different IV calculations fit into the same D/H x Q formula somehow????????

[Nrs. LaLa-Land]

"Desire" is 1,000u...."Have" is 20,000..."Quantity" is 500/cc..

The answer for the first part is 25cc/hr..

You can kind of figure the second part of the question out because from the first part the pt. is getting 25cc=1,000U...so if pt. is ordered rate of 50cc...it's doubled...pt. getting 2,000U an hour

Or....you can divide 20,000 by 500 to see how many Units/CC there are.....there are 40U of heparin for each CC..

So....you want to figure out how many units per hour if rate is 50cc/hr.......multiply 40 x 50cc= 2,000u/hr

I hope I didnt confuse you....now I'm going to figure out the other one...

[Nrs. LaLa-Land]

I'm assuming what you receive from the pharmacy is 1000mg/ml..

It is the same as D/H x Q

750/1000 x ml=0.75 ml...

You only need to worry about the weight of the child if the medication says that the med dosing goes by mg/kg....then you would convert the weight in pounds to Kg ....and go from there.

[RNKPCE]

If the mix is 20,000u in 500cc then................

The first problem 1000u an hour would be 25cc/hr. So if the order reads 50cc/hr the patient would be getting 2000u/hr. So that order wouldn't be accurate. At my hospital our heparin is all standard and premixed 25,000u in 500cc, so 1,000u/hr is always 20cc/hr. We have a label with all the units/hr and cc affixed to the bag and we double check with another RN before any rate change.

The second one you have given enough information. Do you have to dilute the drug first or is it already in diulent? For example is 1000mg in 10cc, then you would have to figure out what 750mg was in, which would be 7.5cc. Also is this dose weight based? With most peds patients I would assume it would be, so how many mg/kg/24hrs?? As I said not enough information on the last one.

[Mimi2RN, ASN, RN]

On the second one, in real life, I would want to know if that was a safe dose for a child of that size......so you get out your drug book and look it up. The book will also tell you about dosing intervals, and mg/kg/24hrs. That info does not appear pertinent to your question, though.