Math Calculation Help Please!!!!!

lilmzsn · Jul 1, 2008

I'm no math whiz but for the first problem I came up with 41.6 gtt/min which you would round to 42 gtt/min, and the second part is 125 ml/hr.

The second problems I sort of struggled with but I gave it a shot and came up with 2.4 hrs. and 144 mins. Hope it's right let me know if I can help further.

LuvScrubs2, BSN, RN · Jul 1, 2008

Hi Lilmzson,

I had the same answer that you got for the 1st problem and my Prof. said it was wrong because you have to recalculate the rate again. Thank you for your help.... I am stuck on the recalculating the rate part. also for #2. I wanted to know how to go about setting up and solving the problem.

Thank you for your help. I appreciate it!!!

Music in My Heart · Jul 1, 2008

#1. the nurse is administering 1,000ml LR IV over 8hours. drop factor : 20 gtt/cc. Calculate the rate in the IV infiltrated after 4hours has infused. Recalculate the rate in
ml/hr___________
gtts/min___________

Same answer as you two: 42 gtt/min and 125 mL/hr

Hi Lilmzson,
I had the same answer that you got for the 1st problem and my Prof. said it was wrong because you have to recalculate the rate again.

If the setup was not changed then the infusion rate at the first minute is the same as at the 4th hour is the same as at the end of the infusion. My question to the prof would be, "Recalculate it again after what?"

Calculate the rate in the IV infiltrated after 4hours has infused.

This sentence is nonsensical to me. Is that verbatim?

Either there's something missing in the problem statement or I'm very confused.

Music in My Heart · Jul 1, 2008

#2. an iv 750 ml d5.45nss is infusing at a rate of 80 drops per min. the drip factor is 15gtt/ml. how long will it take for the iv to infuse?
how many hours___________ and minutes______________.

750 ml x (1 min / 80 gtt) x (15 gtt / 1 ml)

= 140.625 minutes

= 2 hours and 20.625 minutes ~ 2 hrs, 21 minutes

Daytonite, BSN, RN · Jul 1, 2008

the nurse is administering 1,000ml lr iv over 8hours. drop factor : 20 gtt/cc. calculate the rate in the iv infiltrated after 4hours has infused. recalculate the rate in

ml/hr___________

gtts/min___________

there is missing information here. to recalculate a rate you need to know how much of the 1,000 ml is left in the bag of iv fluid after x hours of infusion.

an iv 750 ml d5.45nss is infusing at a rate of 80 drops per min. the drip factor is 15gtt/ml. how long will it take for the iv to infuse?

how many hours___________ and minutes______________.

750 ml/1

(amount to infuse)

x 15 drops/ml

(drip factor of iv tubing)

x 1 minute/80 drops

(drip rate)

=

140.625 minutes

(length of time for iv to infuse)

140.625

divided by

60 minutes = 2.34375 hours

to convert the

0.34375

part of this number back into minutes, multiply it by 60 minutes to get

20.625

and round it up to

21 minutes.

the answer is

2 hours and 21 minutes

.

LuvScrubs2, BSN, RN · Jul 1, 2008

Honestly, I wrote the entire problem out.I was literally going crazy from this problem.... I thank you all from the bottom of my heart for all your help!!!

You wont believe what the answer was to the first problem:

1000 - 400 = 600 ml which is left over, because 400 ml has already infused in 4hrs...

ml/hr = 600ml/4hr = 150ml/hr.

then you take : 150ml x 20gtt/ 60minutes which will give you 50gtt/min.

Thank you sooooooo much for your help!!!!!!