Dosage Calculations Using Dimensional Analysis - …

1 Dosage Calculations Using Dimensional AnalysisShiraz University of Medical Sciences , Aliasghar Salehi, BSN, :Understand the learning components needed for nurses success in performing Dosage Dimensional Analysis to calculate resources for teaching Dimensional Analysis in the ward( MW3).Ways to calculate Dosage :Formula Method VHDA mount to GiveChallenge: 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. Ways to calculate Dosage :Ratio and ProportionLinear Ratio and ProportionFractional Ratio and Proportion500mg : 1 tab :: 1 g : x tabsProduct of the means equals the product of the The products of cross multiplication in a proportion are always equalDimensional AnalysisDimensional Analysis involves setting up a series of information is in one problemNurses do not have to remember multiple stepsNurses ask four simple questions to set up their Dimensional Analysis for Nurses Success in Dosage CalculationsReview of basic math functions fractions and decimalsAddingSubtractingMultiplicationD ivisionNurses mustmemorize equivalentsThe 4 main questionsWhat is the order?

2 What is on hand?Do you need any equivalents?Where are you going? (or what are you being asked to give?)Start with conversions240 mg = _____ grains2401mg Start with conversions240 mg = _____ grains2401160mggrainmg grains144 Order: Lasix 40 mg PO dailyDose on Hand: 80 mg/10 mlWhat is the order?dosemg140 Order: Lasix 40 mg PO dailyDose on Hand: 80 mg/10 mlWhat is on hand?dosemg140mgml8010 Order: Lasix 40 mg PO dailyDose on Hand: 80 mg/10 mlDo you need any equivalents?dosemg140mgml8010 Order: Lasix 40 mg PO dailyDose on Hand: 80 mg/10 mlWhere are you going? (or what are you being asked to give?)mlmgmldosemg_____8010140 Order: Lasix 40 mg PO dailyDose on Hand: 80 mg/10 mlBegin by cross canceling labelsmlmgmldosemg_____8010140 Order: Lasix 40 mg PO dailyDose on Hand: 80 mg/10 mlLabels left should be what you are looking for mlmgmldosemg_____8010140 Order: Lasix 40 mg PO dailyDose on Hand: 80 mg/10 mlDo the mathmlmgmldosemg_____8010140 12551 What about problems with different units of measurement?

3 Order: digoxin elixir mg PO dailyLabel: Digoxin 50 mcg per mlHow many milliliters will you give? mgmcg11000ml1201 Complex ProblemsOrder: Augmentin PO every 12 hours. Child weighs 22 lbs. sends a 75 ml bottle of Augmentin labeled 125mg/5ml. How many milliliters will you pour from the bottle? .122ptlbs 5 What about IV problems?Order: 250ml 5% D/W IV in package reads 15 many gtts/min will you adjust the IV? .min601hr min___gtts 25 Physicians order Daypro 1200 mg bid. mgcapdosemg60011120012cap2 Order: Estratab 1250mcg daily 1 The order reads: Administer 1000cc of D5NS over 10 drop factor on your tubing is 15 many gtts/min?hourscc101000ccgtts115 min601hourgtts/min1412525or2560015000601 115101000 Practice ProblemsYour patient may receive Dilaudid 3 mg IM q3h for pain.

4 Dilaudid is supplied in 1-ml ampules containing 4 mg. How many milliliters will you administer?31mgdose 14mlmg ml = Zamani orders heparin 2500U subq. You have heparin, 5000U per ml. How many ml will you administer? 25001udose 15000mlu ml1212 Your patient needs morphine 1/6 gr. SQ stat for chest pain. You have a 20 ml syring prepared by Miss. Shahryari and labeled 15mg/ml. How many milliliters will you give?161/grdose 115mlmg 601mggr ml166015606151015067//.x 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?

5 50mcgkg/min 5005mlg 122kglbs. 11000mgmcg 11000gmg 601minhour 501500517611221100011000601 .12125140180121122424 Resources for teaching Dimensional AnalysisIV Calculations drip rate problems and Dosage calculation