Need help with Med Math

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I'm stuck on these practice problems, I dont even know where to start. Can anyone help me. I have my math test coming up soon and I want to be well prepared for it. Thank you very much.

1. Order 1000cc D5W over 8 hrs. Administration set: 15 gtts/mL. After 4 hrs. of infusion, 700 mL have infused; how should you adjust the drip rate to complete the infusion on time? Answer 18-19 gtts/min.

2. Order 1000cc 0.45%NS at 75 mL/hr. Administration set: 20 gtts/Ml. How should you regulate the IV? Answer 25 gtts/min.

3. Ordered: Morphine sulfate 40 mg in 250 mL to infuse at 3 mg/h. How many CC's per hr will the infusion run? Answer 18.75 ml/hr

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Specializes in med/surg, telemetry, IV therapy, mgmt.

order 1000cc d5w over 8 hrs. administration set: 15 gtts/ml. after 4 hrs. of infusion, 700 ml have infused; how should you adjust the drip rate to complete the infusion on time? answer 18-19 gtts/min.

1000 cc - 700 ml = 300 ml to be infused in 4 hours.

300 ml/4 hours
(amount to be infused)
x 15 gtts/ml
(drip factor of iv tubing)
x 1 hour/60 minutes
(conversion factor)
= 18.75 gtts/minute
, rounded up to
19 gtts/minute
(drip rate)

note:
drops must be expressed in whole numbers. there are no such things are fractions of drops in iv therapy.

order 1000cc 0.45%ns at 75 ml/hr. administration set: 20 gtts/ml. how should you regulate the iv? answer 25 gtts/min.

75 ml/hour
(infusion rate)
x 20 gtts/ml
(drip factor of iv tubing)
x 1 hour/60 minutes
(conversion factor)
=
25 gtts/minute
(drip rate)

ordered: morphine sulfate 40 mg in 250 ml to infuse at 3 mg/h. how many cc's per hr will the infusion run? answer 18.75 ml/hr

you must know that ml are equal to cc's.

250 ml/40 mg
(dose on hand)
x 3 mg/hour
(dose given)
=
18.75 ml/hour
(rate of infusion)

note:
in the real world, this would be on an iv pump and would be rounded off to infuse at 19 ml/hour.

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Thank you "Daytonite", this helps me out so much!:lvan:

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