HELP!! solve math problem

morte, LPN, LVN · Apr 11, 2009

Yes, we are taught that way, as well..just hard not to use "cc" after 25 years
I worked it like you did, as well..makes sense but other ways makes sense too. Seems if it is 150mg/ML and you would need to know how many mg are in a 50ml bag. Then calculate the problem BUT the first line of the problem says "calculate mg/hr"...what in the world am i missing here..lol..thanks for your time

IF YOU HAVE COPIED IT AS WRITTEN "YOU" arent missing anything, the question is incomplete.....is this multiple choice, if so what are the possible answers

GipsGrl · Apr 11, 2009

I confirmed with a classmate that I copied the question correctly. The only answers I remember on the test was "no correct answer" & like answers in the 50's..One was 53. But any way I worked the promblem didn't come close to the answers I had to choose from...thank you..

Flightline, BSN, RN · Apr 11, 2009

Hey thanks for stopping by..I do believe I am reading too much in the problem..here goes..
IT reads:
Calculate mg/hr. A drug of 400mg is ordered. Available: 600mg/4cc, reconstituted with 50ml?? I am not sure where I fit the 50ml in the equation..if it were just 600mg/4cc, not a problem, Am I reading too much? Thank you..this is driving me nuts...

There is no working of this problem. It doesn't matter whether or not you add 4ml to 50 or how many mg/ml you end up with. The question, which you say is stated correctly, asks you to calculate mg/h but does not give a time parameter over which the quantity is to be given. Therefore, there is no correct answer to the problem.

Having said that, just for fun, we can talk about the reconstituting issue (which is irrelevant to this question). It can read a couple of ways, but as it is, with just a comma between the terms and an -ed on the end of "reconsititute" (600mg/4cc, reconstituted with 50 ml), it is telling you that in front of you is a 50 ml quantity that has a concentration of 600mg in every 4cc, thus there are 7,500mg in the quantity.

If you had a time parameter it would be a simple calculation. 7500/50 = 150 mg/ml. If the MD wants the 50 ml given over 5 hours. That would be 10 ml/h or 1500mg/h.

coolvibesRN · Apr 11, 2009

Hey thanks for stopping by..I do believe I am reading too much in the problem..here goes..
IT reads:
Calculate mg/hr. A drug of 400mg is ordered. Available: 600mg/4cc, reconstituted with 50ml?? I am not sure where I fit the 50ml in the equation..if it were just 600mg/4cc, not a problem, Am I reading too much? Thank you..this is driving me nuts...

Order/what you have. The 50ml reconstition produces 600mg/4cc

(400 mg/600mg)x 4 cc=2.66 cc/min

=2.667 cc x 60 mins =160 cc/hr

Now the question remains, is dose ordered is it 400mg/hr? If so

then

400mg=160 cc/hr

mg ? = 50 cc

(50 cc x 400 mg)/ 160 cc/hr

= 125 mg/hr

Thats how i will do it,but then i took dosage calculations ages ago.Its driving me nuts.What are the choices you have?

Flightline, BSN, RN · Apr 11, 2009

Order/what you have. The 50ml reconstition produces 600mg/4cc
(400 mg/600mg)x 4 cc=2.66 cc/min

Sorry, but look at what you just wrote. Where did the "minutes" ever come into play? There's no time parameter in the question. The question asks how many mg/h, it doesn't say how many hours or parts of an hour, so it can't be calculated.

You are correct that there would be 400mg in 2.67ml.

joebond007 · Apr 11, 2009

you probably should add the 50 ml to the 4 ml to get 54 ml, however there is no rate specified in the problem. Therefore the answer would have to be not enough information. :specs:

coolvibesRN · Apr 11, 2009

Sorry, but look at what you just wrote. Where did the "minutes" ever come into play? There's no time parameter in the question. The question asks how many mg/h, it doesn't say how many hours or parts of an hour, so it can't be calculated.
You are correct that there would be 400mg in 2.67ml.

I placed the question on the wrong paragraph (Now the question remains, is dose ordered is it 400mg/hr?)

I was implying if it was ordered as 400mg/hr then it will be as such= 2.67 ml/min

RedhairedNurse, BSN, RN · Apr 11, 2009

Hey thanks for stopping by..I do believe I am reading too much in the problem..here goes..
IT reads:
Calculate mg/hr. A drug of 400mg is ordered. Available: 600mg/4cc, reconstituted with 50ml?? I am not sure where I fit the 50ml in the equation..if it were just 600mg/4cc, not a problem, Am I reading too much? Thank you..this is driving me nuts...

There has to be more to the question. Is this how the question reads?

If you need mg/hr as your final answer.....than you don't need to figure the ccs into the equation.

Flightline, BSN, RN · Apr 11, 2009

I have no doubt given some of the asinine questions our instructors came up with when I was in nursing school that this is indeed how the question was written, and the correct response is probably other than "can't be calculated."

GipsGrl · Apr 11, 2009

I think you are right..i can't wait to get my test results back to see..so it may be a few days/week before I see the results..but I will let ya'll know..thank you so much for your help. I think this was a " are you critical thinking or just plain ole thinking"...lol...thank you.. :banghead:

Lucky0220 · Apr 12, 2009

I bet the question should have read "calculate the ml/hr" If that were the case, you could just set up a proportion: 600mg:54ml :: 400mg:X Then multiply means and extremes and you get 600X= 21600

Then divide: 21600/600 and you should get X=36ml/hr

Hopefully that is what the question was asking, cause I have seen so many typos on instructor's exams. If not, forget everything I said!!! :twocents: