please help! calculation question

[sashann]

How would you set up and solve this problem?

problem:

Order: Lasix 120 mg, IV, STAT

Drug Available: Lasix 10 mg/ml. IV infusion not to exceed 40 mg/min.

The way my book set it up really confuses me. Someone please show me how they would set it up and maybe it will make more sense.

Thanks so much :)

[TracyB,RN, RN]

dose ordered divided by dose on hand multiplied by quantity(mL)

dose ordered

___________ x quantity available = dose to give

dose on hand

[jeepgirl, LPN, NP]

I always set mine up with what do you need? cc/hr...what do you have 10 mg/ml Lasix. However, wouldn't this be a push and therefore follow the rule of no more than 1 cc per min. If that was true you would push it over 12 mins.

I thought it would be a push also... therefore you don't need a drip rate.

[sashann]

I thought it would be a push also... therefore you don't need a drip rate.

I am pretty sure it is apush now too, once I reviewed last year's notes of similiar problems. So you would give 4ml/min because that would be 40mg/min.That is the most you could give in a minute.

thanks!

[tridil2000, MSN, RN]

How would you set up and solve this problem?

problem:

Order: Lasix 120 mg, IV, STAT

Drug Available: Lasix 10 mg/ml. IV infusion not to exceed 40 mg/min.

The way my book set it up really confuses me. Someone please show me how they would set it up and maybe it will make more sense.

Thanks so much :)

the answer is in the question.

you give 40mg per minute. it's a stat dose, not a drip.

if you have to give 120mg, then you'll need to give the lasix over 3 minutes.

draw up 12mls and give 2 ( 20mg) mls iv push every 30 seconds.

note: pls check the pts bp before giving such a large dose and check his chem 7 in 4 hours!

[tridil2000, MSN, RN]

that is correct I forgot my gtt/min factor as well.

So the gtts/min/ml would be 60 because it is pump tubing.

Then I would have to re-do it and this is how I would do it bascially the same way:

I want ml/min in my answer

ml/min = 120 mg X ml X 40 mg X 1 gtts X ml X min

----------------------------------------

1 mg X 10 mg X min x 60 gtts X min X ml

Next step is to cancel out likes and numbers if you wish too and you will have this:

120 X ml X 40 20 X ml X 40

------------- Equal -----------

10 10

Next step is to multiply across and you would get this:

2 X ml X 40 = 80

----------------

10

Next to divide and you will get this

80 = 8

---

10

and your answer is 8mls/min

Buttons

you can not give 8 mls (80mg) of lasix over a minute.

it's too much.

[Nurseismade RN]

dose ordered divided by dose on hand multiplied by quantity(mL)

dose ordered

___________ x quantity available = dose to give

dose on hand

Thanks TracyB, RN.....that is how I understood it. I start my rn class in September. :)

ps I am a formula girl :chuckle

[P_RN, ADN, RN]

Order: Lasix 120 mg, IV, STAT

Drug Available: Lasix 10 mg/ml. IV infusion not to exceed 40 mg/min.

I usually do the have is to want.

have 10 [mg] / in 1 ml is to want 120 [mg]/in x number of ml

120/10=12

And because of hearing toxicity etc no more than 40mg/min

So 120mg=12cc you can give it over 3 minutes no less

I might add Lasix usually comes in a more concentrated form such as 80/2ml or 40/1ml

Good luck on your classes.

[snowfreeze, BSN, RN]

Looks like an IV push, you can push 120mg over 3 mins and not exceed 40mg/min. This is the fastest you can give this IV. No matter what you dilute 120mg in, 3 mins is the fastest you can administer it. Personally I think my ears would be ringing at that rate (tinnitus is the side effect of lasix too fast).

[truern]

Ya'll must take different drug calc tests than I do....very seldom does it matter what medication example is used, it's the MATH they're interesting in unless that med was specifically mentioned in lecture.