Dosage Calculation using Dimensional Analysis Week 3 NURS

Dosage Calculation using Dimensional Analysis Week 3 NURS B 260

Self Evaluation: take a few minutes and see what you can do independently and what you need help with… 1. Your client weighs 15. 6 kg. Convert this to the nearest whole pound. 2. The order is for cefotaxime 1 g IV every 8 hours. How many ml of sterile water would you use to reconstitute the medication? How many ml are required for one dose?

Self Evaluation: take a few minutes and see what you can do independently and what you need help with… 1. Your client weighs 15. 6 kg. Convert this to the nearest whole pound. 34# 2. The order is for cefotaxime 1 g IV every 8 hours. How many ml of sterile water would you use to reconstitute the medication? 47 m. L How many ml are required for one dose? 5 m. L

Competency 2: Calculate the measurement of medication when the strength is not available The health care provider orders Pepcid 20 mg. p. o. twice per day. Pepcid 10 mg. tablets are available. How many tablets will you give for one dose?

The health care provider orders Pepcid 20 mg. p. o. twice per day. Pepcid 10 mg. tablets are available. How many tablets will you give for one dose? X tabs. = 1 tab x 20 mg. 1 Answer: 2 tablets

Competency 2 Practice 1. Morphine Sulfate 2 mg. is ordered IV push now. The vial reads Morphine Sulfate 8 mg. /1 m. L. How many m. L. will you give? xm. L = 1 m. L x 2 mg 8 mg 1 Answer: 0. 25 m. L 2. Potassium Chloride 20 m. Eq. p. o. is ordered now. The available liquid is 40 m. Eq. /15 m. L. How many m. L. will you give? Answer: 7. 5 m. L.

Competency 2 Practice 1. Morphine Sulfate 2 mg. is ordered IV push now. The vial reads Morphine Sulfate 8 mg. /1 m. L. How many m. L. will you give? xm. L = 1 m. L x 2 mg 8 mg 1 Answer: 0. 25 m. L 2. Potassium Chloride 20 m. Eq. p. o. is ordered now. The available liquid is 40 m. Eq. /15 m. L. How many m. L. will you give? Answer: 7. 5 m. L. xm. L = 15 m. L x 20 m. Eq 40 m. Eq 1

Competency 2 Practice 3. Atenolol 25 mg. is ordered p. o. once per day. Atenolol 50 mg. tablets are available. How many tablets will you give? Answer: ½ tablet

Competency 3: Calculate the number of doses available from bulk supply Amoxicillin suspension 100 mg. p. o. is ordered every 8 hrs. The label reads 125 mg. /5 m. L. The bottle contains 120 m. L. How many doses are in this bottle of suspension?

Amoxicillin suspension 100 mg. p. o. is ordered every 8 hrs. The label reads 125 mg. /5 m. L. The bottle contains 120 m. L. How many doses are in this bottle of suspension? X dose = 1 dose x 125 mg. x 120 m. L 100 mg. 5 m. L. 1 Answer: 30 doses

Competency 3 practice Advil 400 mg. is ordered 3 times daily after oral surgery. The bottle contains 25 tablets that are 200 mg. each. How many full doses are in the bottle? X dose = 1 dose x 200 mg. x 25 tabs 400 mg. 1 tab 1 Answer: 12 doses

Competency 6: Calculate the Infusion Rate for IV fluids Key concepts Drops per minute for IV infusing by gravity Electronic IV pumps/Smart Pumps Macrodrip sets 10 -20 gtt per m. L Microdrip sets 60 gtt per m. L

Competency 6 Practice: Manual or Gravity IV infusions Your client is receive 1000 m. L of Normal Saline over 8 hours. The drop factor is 20 gtt. /m. L. Calculate the drip rate of this infusion in gtt. /min. X gtt = 20 gtt x 1000 m. L x 1 hr. Min 1 m. L 8 hours 60 min Answer: 42 gtt. /min

Competency 6 Practice: Electronic Pump IV infusions Your client is receive 1000 m. L of Normal Saline over 8 hours. At what rate should you set the IV pump (in m. L. /hr. )? X m. L. = 1000 m. L hr. 8 hrs. Answer: 125 m. L/hr.

Competency 6 Practice Order: 300 m. L of D 5 W over 12 hours. The drop factor is 60 gtt. /m. L. Calculatethe drip rate in gtt. /min.

X gtt = 60 gtt. X 300 m. L x 1 hr. min 1 m. L. 12 hr. 60 min. Answer: 25 gtt. /min.

Competency 6 Practice Order: Zosyn 2 g in 50 m. L. of NS IVPB to infuse via pump over 30 minutes. At what rate in m. L. /hr will you set the pump?

X m. L = 50 m. L x 60 min. hr. 30 min 1 hr. Answer: 100 m. L/hr.

Competency 7: Calculate the running time of IV fluid The IV bag has 450 m. L remaining. It is infusing at 35 gtt/min via tubing that has a drop factor of 15 gtt/m. L. How many hours will it take for this volume of fluid to infuse? X hrs. = 1 hr. x 1 min 60 min. 35 gtt. x 15 gtt. x 450 m. L 1 m. L 3. 2 hours or 3 hours and 12 minutes 1

Competency 7 Practice 1. Calculate the gtt. per minute rate needed to infuse 250 m. L over 3 hours using IV tubing with a drop factor of 20 gtt. /m. L.

X gtt. = 20 gtt. x 250 m. L x 1 hr. min. 1 m. L 3 hrs. 60 min. Answer = 28 gtt. /min.

Competency 7 Practice 2. A 50 m. L. IVBP bag is infusing at 50 gtt. /min via tubing with a drop factor of 60 gtt. /m. L. How many minutes will it take the IV to infuse?

X min. = 1 min. x 60 gtt. x 50 m. L. 50 gtt. 1 m. L 1 Answer = 60 min.

Competency 8: Calculate the amount of medication received when only a portion of the IV bag infused The confused client pulls out his IV after the infusion of only 150 m. L of an IV bag containing Vancocin 500 mg. in 200 m. L. of NS. How many mg. of Vancocin did the client receive? X mg. = 500 mg. X 150 m. L. 200 m. L 1 Answer: 375 mg.

Competency 8 practice 1. The client’s IV “infiltrates” after the infusion of only 100 m. L of an IV bag containing Vancocin 1 g. in 250 m. L. of NS. How many mg. of Vancocin did the client receive?

X mg. = 1000 mg. x 1 g 250 m. L. Answer: 400 mg. 100 m. L. 1

Competency 8 practice 2. 1. 6 million units of Penicillin G K in 150 m. L of D 5 W is ordered to infuse over 45 minutes. The IV stops after 20 minutes. How many units of Penicillin remain in the bag? (Answer as whole number)

X units = 1, 600, 000 units x 20 min. 45 min. 1 Answer: 711, 111 units infused. 1, 600, 000 – 711, 111 = 888, 889 units

Competency 8 practice 3. The infusion of Aminophylline 200 mg. in 500 m. L of D 5 W stopped after 350 m. L had infused. How many mg. of Aminophylline remain in the bag?

X mg. = 200 mg. X 350 m. L 500 m. L 1 Answer: 140 mg. infused. 200 mg. – 140 mg. = 60 mg remaining