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Dosage Calculations Using Dimensional Analysis

Dosage Calculations Using Dimensional Analysis

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Dosage Calculations Using Dimensional Analysis

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  1. Dosage Calculations Using Dimensional Analysis Anyone can do it!

  2. Outcomes: • Understand the learning components needed for student success in performing dosage calculations. • Utilize dimensional analysis to calculate dosage. • Potential resources for teaching dimensional analysis in the classroom.

  3. Ways to calculate dosage: • Formula Method Amount to Give Challenge: Must remember the extra step of changing D and H to same unit of measurement. Also may have extra variables such as body weight, times per day, etc.

  4. Ways to calculate dosage: • Ratio and Proportion • Linear Ratio and Proportion • Fractional Ratio and Proportion 500mg : 1 tab :: 1 g : x tabs Product of the means equals the product of the extremes. The products of cross multiplication in a proportion are always equal

  5. Dimensional Analysis • Dimensional Analysis involves setting up a series of fractions. • All information is in one problem • Students do not have to remember multiple steps • Students ask four simple questions to set up their dimensional analysis problem.

  6. Necessities for Student Success in Dosage Calculations • Review of basic math functions – fractions and decimals • Adding • Subtracting • Multiplication • Division • Students must memorize equivalents

  7. The 4 main questions • What is the order? • What is on hand? • Do you need any equivalents? • Where are you going? (or what are you being asked to give?)

  8. Start with conversions 240 mg = ______ grains

  9. Start with conversions 240 mg = ______ grains 4 4 grains 1

  10. Order: Lasix 40 mg PO dailyDose on Hand: 80 mg/10 ml • What is the order?

  11. Order: Lasix 40 mg PO dailyDose on Hand: 80 mg/10 ml • What is on hand?

  12. Order: Lasix 40 mg PO dailyDose on Hand: 80 mg/10 ml • Do you need any equivalents?

  13. Order: Lasix 40 mg PO dailyDose on Hand: 80 mg/10 ml • Where are you going? (or what are you being asked to give?)

  14. Order: Lasix 40 mg PO dailyDose on Hand: 80 mg/10 ml • Begin by cross canceling labels

  15. Order: Lasix 40 mg PO dailyDose on Hand: 80 mg/10 ml • Labels left should be “what you are looking for”

  16. Order: Lasix 40 mg PO dailyDose on Hand: 80 mg/10 ml • Do the math 1 5 5 2 1

  17. What about problems with different units of measurement? Order: digoxin elixir 0.05 mg PO daily Label: Digoxin 50 mcg per ml How many milliliters will you give? 20 ml 1 1

  18. Complex Problems Order: Augmentin 12.5mg/kg PO every 12 hours. Child weighs 22 lbs. Pharmacy sends a 75 ml bottle of Augmentin labeled 125mg/5ml. How many milliliters will you pour from the bottle? 5 ml

  19. What about IV problems? Order: 250ml 5% D/W IV in 2.5 hours. Tubing package reads 15 gtts/ml. How many gtts/min will you adjust the IV? 25

  20. Physicians order Daypro 1200 mg bid. 2 2 cap 1

  21. Order: Estratab 1250mcg daily tab 1

  22. The order reads: Administer 1000cc of D5NS over 10 hrs.The drop factor on your tubing is 15 gtts/cc.How many gtts/min? 25 1 25 gtts/min 4 or 1

  23. Practice Problems

  24. Your patient may receive Dilaudid 3 mg IM q3h for pain. Dilaudid is supplied in 1-ml ampules containing 4 mg. How many milliliters will you administer? ml ¾= 0.75

  25. The physician orders heparin 2500U subq. You have heparin, 5000U per ml. How many ml will you administer? 1 ml 2

  26. Your patient needs morphine gr 1/6 SQ stat for chest pain. You have a 20 ml vial labeled 15mg/ml. How many milliliters will you give? ml 0.67

  27. A patient with tachycardia has an order for Brevibloc to be started at 50 mcg/kg/min. The concentration is Brevibloc 5 g in 500ml of D5W. The patient weighs 176 pounds. How many ml/h should the IV pump be programmed for? 24 ml/hr 1 2 25 12 1 80 24 1 2 40 1 1 1

  28. Resources for teaching Dimensional Analysis IV Calculations site http://www.geocities.com/Heartland/Valley/3049/iv/clcltns.html  Math tutorials http://www.utep.edu/nurs4710/tutorials/  IV drip rate problems and dosage calculation problems http://www.dalesplace.net/iv.htm

  29. Nursing Math Simplified“Math Magic”Author: Susan Garner MooreISBN: 0-943202-22-153 page book – basics on what they call “Math Magic”

  30. Quick & Easy Dosage Calculations • Quick & Easy Dosage Calculations: Using Dimensional Analysis • by: Christina Wu Nasrawi, Judith Ann Allender, Maura Conner • Product Details • Paperback: 318 pages ; Dimensions (in inches): 0.75 x 10.00 x 8.50 • Publisher: W B Saunders; 1st edition (February 15, 1999) • ISBN: 0721671330

  31. Clinical Calculation Made Easy • Clinical Calculations Made Easy:Solving Problems Using Dimensional Analysis : Softbound • By Gloria Craig • Edition: Second • ISBN: 0-7817-3099-6 • Pub Date: February 2001 • Pages: 272 • Illustrations: 245

  32. Medical Dosage Calculations • Medical Dosage CalculationsJune Looby Olsen, Leon J. Ablon, Anthony P. Giangrasso, Anthony Patrick Giangrasso • ISBN: 0805356053Format: Paperback, 336ppPub. Date: January 1995 • Publisher: Benjamin-Cummings Publishing CompanyEdition Description: Older Edition

  33. Dimensional Analysis for Meds • Dimensional Analysis for MedsAnna M. Curren, Laurie D. Munday • ISBN: 076685938XFormat: Paperback, 319ppPub. Date: November 2001 • Publisher: Delmar LearningEdition Description: 2ND BK&CDREdition Number: 2

  34. Dosage Calculations • Dosage Calculations : A Simplified ApproachBillie Ann Wilson, Billie E. Wilson, With Margaret T. Shannon • ISBN: 083859297XFormat: Paperback, 219ppPub. Date: December 1996 • Publisher: Appleton & LangeEdition Description: 3rd EditionEdition Number: 3

  35. Calculating Drug Dosages • Calculating Drug Dosages: An Interactive Approach to Learning Nursing MathSandra Luz Martinez De Castillo, Sandra Luz Castillo, Maryanne Werner-McCullough • ISBN: 0803605781Format: Other Format, 128ppPub. Date: January 2002 • Publisher: Davis F AEdition Description: BK&CD-ROMEdition Number: 1

  36. Work with it and Give it time Try it - You'll like it!!