# Med Math IV/NG fluid replacement

Posted
by sauzie (New)

I have my last med math exam on Monday and they threw a new problem at us this semester with little explanation on how to solve it. I've been staring at this problem trying to get the answer on the key for hours with no luck. Can anyone explain it?! Help!

"Your client has an NG tube inserted. You are to replace NG drainage output from the previous shift at 30mL IV NS for every 50mL of NG drainage. This particular order states that you should run the replacement fluid evenly spaced over an 8 hour period. The primary IV is NS running at 75mL/hr continuously."

Question 1: How many mL's an hour would you replace if the NG drainage for the past shift was:

#1) 220ml

#2) 175ml

#3) 300ml

Using the answers from question 1 answer the following question. How many ml/hr will the I be set to accommodate this additional IV fluid?

#1)

#2)

#3)

Same order again. How many ml would this client receive in:

#1) 2hr _______ 8hr_______

#2) 2hr _______ 8hr_______

#3) 2hr _______ 8hr_______

Just break it down.

19 minutes ago, sauzie said:

You are to replace NG drainage output from the previous shift at 30mL IV NS for every 50mL of NG drainage.

Do you understand this part?

If the patient had 100 ml NG output the previous shift, how much NS will you give?

60mL replacement for 100mL lost

Yep.

So you just proceed with all the questions accordingly.

Possibly the reason you are getting different answers than your answer key is because they don't tell you whether they want you to add the replacement fluid to the baseline rate of 75 ml/hr.

I believe it makes the most sense that these must be added together. IOW, the replacement rate is on top of (in addition to) the baseline rate.

Does any of that help?

So the answer for the 220mL lost on the key is 16.5 (rounding up to 17). I can't get that answer

I think I figured it out now. I wasn't dividing it by the 8 hours of the shift. 😵

What answer are you getting? Just show your work and then I'll show you mine. 😬

Just now, sauzie said:

I think I figured it out now. I wasn't dividing it by the 8 hours of the shift. 😵

Great! You got it.

Good job!

220 output

Replace 30 ml for each 50 lost.

(220/50) x 30 = 132 ml

132 over 8 hrs = 16.5