calculation question (HELP!!)

Published

today I had a pantoloc drip (8mg/hr) the nurse took one look at it and said the rate was 20ml/hr?

I have been busting my brain in trying to figure out how she got that, but I still don't know how. If some one could PLEASE PLEASE explain how she got the rate I will be FOREVER gratefu l:redbeathe

Thank you in advance:bow:

40mg : 50 ml = 4 mg : X

40X = 200

______________________

40 40

X = 5 mL/minute

Up Vote Up Vote ×
Specializes in ICU.
no, because the 10 ml was taken directly from the 100 ml back.!!

OK - that makes sense then. Thanks!

Up Vote Up Vote ×
40mg : 50 ml = 4 mg : X

40X = 200

______________________

40 40

X = 5 mL/minute

This needs to be ml/hour since the question is asking what to set the pump for and pump dispense in ml/hr...

Up Vote Up Vote ×
40mg : 50 ml = 4 mg : X

40X = 200

______________________

40 40

X = 5 mL/minute

This needs to be ml/hour since the question is asking what to set the pump for and pumps dispense in ml/hr...

Up Vote Up Vote ×

thats the answer I also go, but the nurse just basically said that it has to infused in 30minutes. completely forgot to add (it was hanged by gravity, if that makes any difference)

How did he get the 30 mins?

Thanks

Up Vote Up Vote ×

Alright, here's what I got. The 4mg/min is in my drug book. It states not to exceed this dose in renal impaired pts, so I don't think it factors into the calculation except as a safe dose range piece of info.

50ml x 60min = 3000 = 100ml/hr

30min...1hr.......30

to figure gravity instead of pump you need to know the drop factor of your tubing and convert your ml/hr to gtts/min. Do you know the drop factor of the tubing used?

p.s. the 30 min may have been in the Dr order.

Up Vote Up Vote ×

15 gtt

I have been going over this in my mind and on paper for 3 days straight, none of the nurses know why or how they get 30 mins.

And I have tried numerous ways of calculation and none of them come to 30 mins, so I guess pharmacy/MD just choose that rate.

Up Vote Up Vote ×

Most of the time Dr write orders for dose and time for IV meds, then the pharmacy sends up the med mixed for that dose. The nurse then figures ml/hr on an infusion pump or gtts/min for gravity based on the drop factor of the tubing,time to give, and dose. The Dr bases the time on the pts weight and any factors such as renal health issues, the pt has so it doesn't exceed the safe dose range for that pt. I'm sure the Dr order probably said "over 30 min" or the pharmacy calculated the time based on the dose, pt health, and wt.

The gtts/min I got based on a 30min admin rate was 25 gtts/min to set the drip chamber to for gravity admin of medicine in 30min

50ml x 15gtts/ml = 25gtts/min

.....30min

Up Vote Up Vote ×

40mg (40mg|4ml) of lasix is in 50 ml bag the instruction says 4mg/min how do you calculate what rate to but for the IV?

then multiply my answer X 60 minutes, I was about to go to bed for clinical when I did the calc. sorry for the confusion.

If you want the drop factor it's:

Volume to be infused X drop factor

_____________________________

Time in minutes

The only time they don't give you a drop factor is if they state micro tubing which is 60 gtt/minute

Up Vote Up Vote ×
+ Join the Discussion