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Dosage Calculation Using Dimensional Ana
 

Dosage Calculation Using Dimensional Ana

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    Dosage Calculation Using Dimensional Ana Dosage Calculation Using Dimensional Ana Presentation Transcript

    • Calculate with Confidence 5 th edition Gray Morris Mosby items and derived items © 2010 by Mosby, Inc., an affiliate of Elsevier Inc.
    • Dosage Calculation Using the Dimensional Analysis Method Unit Three: Chapter 16 Mosby items and derived items © 2010 by Mosby, Inc., an affiliate of Elsevier Inc.
    • Dosage Calculation Using Dimensional Analysis Method: Objectives
      • After reviewing this chapter, you should be
      • able to:
        • Define dimensional analysis
        • Implement unit cancellation in dimensional analysis
        • Perform conversions using dimensional analysis
        • Use dimensional analysis to calculate dosages
    • Background: Dimensional Analysis
      • Fancy name—simple technique
      • Used to manipulate units in a calculation
      • Involves cancellation of unwanted units
      • Eliminates need to memorize formulas
      • Also known as the factor-label method or the unit factor method
      • Only one equation is used
    • Performing Conversions Using Dimensional Analysis
      • Conversions can be made within process of calculation rather than in advance
      • Equivalents or conversion factors are expressed as fractions written in one of two ways without changing meaning or value—e.g., CF: 1 kg = 1,000 g is the same as 1 kg/ 1,000 g or 1,000 g/ 1 kg
    • Making Conversions Using Dimensional Analysis
      • Identify desired unit
      • Identify equivalent needed
      • Write equivalent in fraction format with desired unit in numerator as first part of equation
      • Label all factors in equation, with x being what you desire to have in the end
    • Making Conversions Using Dimensional Analysis (cont’d)
      • Identify unwanted or undesired units and cancel, then reduce to lowest terms
      • Must be able to eliminate all labels except for answer label—if not, recheck
      • Perform mathematical process
      • Note: it is key to have the
      • equivalent set up correctly!
    • Making Conversions Using Dimensional Analysis (cont’d)
      • Example: 1.5 g = _______ mg
      • The desired unit is mg
      • Equivalent: 1,000 mg = 1 g
      • Write equivalent—keep mg in numerator (allows cancellation of unwanted unit, g)
      • Write equivalent as fraction, add multiplication sign
      • Perform calculation
    •  
    • Dosage Calculation Using Dimensional Analysis
      • Identify unit of measure (caps, mL, tabs) and place x on left with appropriate unit
      • On right, place available information as a fraction — information matching the x unit will be placed in the numerator
      • Enter additional factors — set up so unit of numerator matches preceding denominator
      • Cancel out like units — remaining unit should match the unit for x — then calculate
    • Dosage Calculation Using Dimensional Analysis (cont)
      • Example: Order is Lasix 40 mg p.o. daily
      • Available: 20 mg tablets
      • Place desired unit of measure on left and label as x
      • x = tab
    • Dosage Calculation Using Dimensional Analysis (cont’d)
      • Example: Order is Lasix 40 mg p.o. daily
      • Available: 20 mg tablets
      • Place the info in problem on right in fraction format—matching desired unit in numerator
    • Dosage Calculation Using Dimensional Analysis (cont’d)
      • Example: Order is Lasix 40 mg p.o. daily
      • Available: 20 mg tablets
      • Enter additional info (e.g., what is ordered), matching unit in numerator with preceding denominator
    • Amount to administer Available dosage Ordered dosage
    • Dosage Calculation Using Dimensional Analysis (cont’d)
      • Cancel “like” units on right of equation; remaining unit of measure should be what is desired
    • Dimensional Analysis Using Conversion Factor
      • When a conversion factor is needed, the conversion factor is placed as the second fraction inside the equation
      • Match numerator of conversion factor with denominator of previous fraction
    •