Help with a Math question

Daytonite, BSN, RN · Dec 2, 2007

here the problem:
an iv of 800ml was to infuse over 8hrs at 20 gtt/min. after 4hr 15min only 300ml have infused. recalculate the gtt/min rate to complete the schedule. the set calibration is 15 gtt/ml.

well, i like to do dimensional analysis in order to get the gtts/minute on the final answer, but i have to do a little pre-math on this first.

800ml - 300ml = 500ml

left to infuse

8 hours - 4 hours, 15 minutes = 3 hours, 45 minutes

(

or, 225 minutes

) left to get the fluid infused

500ml/225 minutes

(dose desired)

x 15 gtts/1 ml

(drip factor of iv tubing)

= 33.333 gtts/minute

, rounded off to

33 gtts/minute

(there is no such thing as 33.33 drops in real life)

09RN · Dec 2, 2007

well, i like to do dimensional analysis in order to get the gtts/minute on the final answer, but i have to do a little pre-math on this first.
800ml - 300ml = 500ml
left to infuse
8 hours - 4 hours, 15 minutes = 3 hours, 45 minutes
(
or, 225 minutes
) left to get the fluid infused

500ml/225 minutes
(dose desired)
x 15 gtts/1 ml
(drip factor of iv tubing)
= 33.333 gtts/minute
, rounded off to
33 gtts/minute
(there is no such thing as 33.33 drops in real life)

do it the same way! i was lost on the mins. wasnt sure how to place them in the formula. thanks so much!!!!