reconstitution

meandragonbrett · Dec 15, 2007

That makes absolutely no sense to me.

Daytonite, BSN, RN · Dec 15, 2007

What's the drug you are talking about? Sounds to me like you need to divide the 36mL in half and inject half of the 36mL into the vial, let it set for a little bit of time and then add the remainder of the 36mL. The total amount after it is all mixed will be 60mL which includes what was originally in the vial.

gapeachICU-nurse · Oct 29, 2008

does this look like it's missing info:

ordered: 2 mL

supply: 2% lidocaine in 30 mL

dilute for a total of 10 mL

what volume do you add? .1

what amount of normal saline? .9

can anyone help me figure this out...

the answers are given but I cant remember how I did the problem....

i know it was 20mg/ml then....

DreamingTree · Oct 29, 2008

does this look like it's missing info:
ordered: 2 mL
supply: 2% lidocaine in 30 mL
dilute for a total of 10 mL
what volume do you add? .1
what amount of normal saline? .9
can anyone help me figure this out...
the answers are given but I cant remember how I did the problem....
i know it was 20mg/ml then....

It looks like it is missing information. Your answer is in mg/mL -- but the information given before that only lists the mL. Does the original problem provide the mg ordered & the mg supplied? If so, then you just plug this information into the following formula:

Desired (mg ordered)

-------------------- X Volume (mL available)

Have (mg available)

Here's an example:

Desired = 2 mg (lidocaine ordered)

---------------------------------- X 1 mL (volume available) = 0.1 mL

Have = 20 mg (lidocain supplied)

If this amount has to be diluted to make 10 mL total, then you would take the 0.1 mL lidocaine (from the vial supplied) and add 0.9 mL NSS. You would start with 2 mg/0.1 mL (lidocaine), which is the same ratio of the lidocaine supplied (20 mg/1 mL). Once it's diluted, you have a strength of 2 mg/10 mL.

Again, since the original information didn't have mg, I guessed at the values that should have been listed. It was an educated guess, though because lidocaine 2% is available at 20 mg/mL.

Hope this makes sense!!

gapeachICU-nurse · Oct 29, 2008

thanks dreamingtree you were right on time. Hope I passed; this was my second try & you only get three. Really appreciate it:bowingpur

DreamingTree · Oct 29, 2008

I'll keep my fingers crossed for you.

I remember those darn dosage calc tests -- very anxiety provoking. The key to doing those problems is to:

1-- keep your units straight

2-- always use your formulas

3-- ALWAYS check your work

Good luck!!

gapeachICU-nurse · Oct 30, 2008

Thanks for the tips; you're the best. Although I made two stupid mistakes and only get 1 more chance or I fail 8 hrs worth of classes. Isn't that insane?

Wish me luck: IT's next Wednesday now. If anyone thinks of anything else helpful let me know. They are real strict about all the rounding & do reconstitution problems, mcg/kg/min, units, Fluid restriction....etc.

:bluecry1:

I am freaking out. I am an "achieving the curriculum expeditiously" student w/ 18 hrs my first semester. OmG, I am struggling to stay above water. I really want to make good grades, learn this, & be a :nurse: