Please, I really need desperate help! Math...

jamhoyz · Apr 11, 2009

Hi gosh I really wish I knew how to solve those problems, but unfortunately I don't. I wonder is someone can help you out with them, it seems as if you are really struggling after reading your discussion. Good luck!

victo019 · Apr 11, 2009

2. Child's BSA: 0.9m2

Order:Carmustine 75 mg/m2 every day times 2

Available: 100 mg/10 mL vial

How many mL would you administer?

Correct answer 6.75

All you do is say 0.9m2 x 75mg and it gives you 67.5mg (this is how much they will get everyday times 2)

Next you take 100mg/10ml and reduce it to Xmg/ 1ml so that would be 10mg/1ml

Next you take what you need (67.5mg) and divide by what you have available (10mg) = 6.75ml

You can do all of them this way. This is the shorthand way. Some people have to see the mg/ml to cancel out, but I always just reduce my avaiable drug to however many mg over 1 ml. In this example your drug was 100mg/10ml. You just say 100/10 and it gives you 10mg per ml. Then you take what you need (the ordered dose) and divide by what you have (drug on hand). Hope this helps!

rita.kumar83 · Apr 12, 2009

Hi thank you so much for the reply, it did help me. But, I tried to solve the other problem the same way but didnt get to the answer. The problem is:

Child's BSA: 0.62 m2

Order: 25 mg/m2 weekly

Available: 2 mg/mL in 25 mL vial

0.62x25=15.5 (I did get the answer but not by solving the whole problem)

2 divided by 25=0.08

15.5 divided by 0.08=193.75

Daytonite, BSN, RN · Apr 12, 2009

i think that your answer key has some wrong answers.

1. child's bsa: 1.1 m2

order: betamethasone 4 mg/m2/day po, divided into four doses is ordered.

available: syrup 0.6/5 ml

how many ml will you admister per dose?

i get, assuming the

0.6/5 ml

is

0.6

mg

/5 ml

. . .

4 mg/m2

(dose desired per day)

x 1.1 m2

(child's bsa)

/4 doses

(number of doses per day)

x 5 ml/0.6 mg

(dose on hand)

= 9.1666 ml

, rounded off to

9.17 ml

(amount to give)

2. child's bsa: 0.9m2

order:carmustine 75 mg/m2 every day times 2

available: 100 mg/10 ml vial

how many ml would you administer?

75 mg/m2

(dose desired)

x 0.9 m2/1

(child's bsa) x 10 ml/100 mg (dose on hand)

=

6.75 ml

(amount to give)

3. child's bsa: 0.62m2

order: daunorubicin 25 mg/m2 weekly.

available: 2 mg/ml in 25 ml vial.

i get. . .

25 mg

(dose desired)

x 0.62 m2/1

(child's bsa)

x 1 ml/2 mg

(dose on hand)

=

7.75 ml

(amount to give)

collegemom1961 · Apr 12, 2009

I agree with DaytoNite. I think the answer key for #1 and #3 are incorrect. I got the same answers as he/she did. I work all my drug problems out using scientific notation. That's what I learned in science in college and that's what I was most comfortable with in nursing school. That way I can set the problem up as one calculation and see that everything cancels out. Good luck.

ChicagoICU_RN · Apr 12, 2009

i think that your answer key has some wrong answers.
1. child's bsa: 1.1 m2
order: betamethasone 4 mg/m2/day po, divided into four doses is ordered.
available: syrup 0.6/5 ml
how many ml will you admister per dose?
i get, assuming the
0.6/5 ml
is
0.6
mg
/5 ml
. . .
4 mg/m2
(dose desired per day)
x 1.1 m2
(child's bsa)
/4 doses
(number of doses per day)
x 5 ml/0.6 mg
(dose on hand)
= 9.1666 ml
, rounded off to
9.17 ml

(amount to give)
2. child's bsa: 0.9m2
order:carmustine 75 mg/m2 every day times 2
available: 100 mg/10 ml vial
how many ml would you administer?
75 mg/m2
(dose desired)
x 0.9 m2/1
(child's bsa) x 10 ml/100 mg (dose on hand)
=
6.75 ml
(amount to give)
3. child's bsa: 0.62m2
order: daunorubicin 25 mg/m2 weekly.
available: 2 mg/ml in 25 ml vial.
i get. . .
25 mg
(dose desired)
x 0.62 m2/1
(child's bsa)
x 1 ml/2 mg
(dose on hand)
=
7.75 ml
(amount to give)

im not in the nursing program yet...but we can take a nuring100 class (intro to nursing)...and we learned this (thank god i took it)....i was struggling with it untill i learned the method above...which is basicallay a ratio proportion problem...good luck!!

renebel · Jul 6, 2010

Please help me with this ...For the client whose weight is 60 kgs abd has dopamine ordered at mcg/kg/min what rate should the infusion pump be set for a solution of 400 mg dopamine in 250 ml of DSW? will someone show me step by step solution to it? thank you.

renebel · Jul 6, 2010

This is another problem I need help with. The pt. is experiencing hypotension. The MD wants to start infusing an epinephrine drip at 3mcg/min. Epinephrine is mixed in the pharmacy with each bag containing 15 mg/250 ml of NSS. At what rate would you set the pump to deliver the ordered dose?