Nur 283 Hy Math Review

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  • 1. Math Review
    NUR 283HY
  • 2. Abbreviations
    Review acceptable and non-acceptable abbreviations
    Pharmacology book
    Fundamentals book
    Kee & Marshall
    Inside front cover
    Chapter 3, pg. 68-70
  • 3. Rounding
    NOTE: Don’t round until you have completely finished the problem
    Rounding within the problem will
    result in a close answer,
    but not an exact one
  • 4. Rounding
    To round to the nearest tenth,
    carry out the division process to
    hundredths place (2 positions to the right of the decimal)
    3/8 = 0.37
    1/3 = 0.33
    3/4 = 0.75
  • 5. Rounding
    Next, look at the number in the hundredths place
    If the number is less than 5, then round down
    0.33 rounds to 0.3
    If the number is 5 or higher, then round up,
    0.75 rounds to 0.8
    0.37 rounds to 0.4
  • 6. Volume and Concentration
    Meds are given to clients in some type of volume
    (ml, tablets, capsules, mEq, units, etc.)
    Concentration indicates the amount of medication in a given amount of solution (mg/ml, units/ml, mg/tablet, etc.)
  • 7. Conversions
    Remember a conversion = 1
    It can be used in an equation with either number as the numerator or denominator
    The unit of measure is BEFORE THE NUMBER in the apothecary system
    The unit of measure is AFTER THE NUMBER in the metric and household systems
  • 8. Common Metric Conversions
    Metric:
    1 kg = 2.2 pounds (#)
    1 kg = 1000 g
    1 mg = 1000 mcg
    1 g = 100 mg
    2.54 cm = 1 inch
  • 9. Other Common Conversions
    Apothecary:
    1 grain = 60 mg
    Remember ss = ½ grain
    Household:
    1 teaspoon = 5 ml
    30 ml = 1 ounce
    3 teaspoons = 1 tablespoon
  • 10. Basic Formula
    D x V = amount to be given
    H 1
    D = desired dose (what client is supposed to receive)
    H = dosage you have on hand
    V = volume or vehicle that the dosage on hand is in
    ‘D’ and ‘H’ must be in the same unit of measurement
  • 11. Setting up Problems
    Use the label factoring method (dimensional analysis – DA). This method uses labels with the numbers to arrive at the correct answer
    (Kee pg. 92- 104)
    Determine unit of measurement for answer
    Set up problem until labels cancel out and you are left with correct label for the answer
  • 12. Dosages based on Weight
    Drugs may be ordered based on the weight of the client
    (amount of mg of the drug per kg of weight)
    When converting weight in pounds to weight in kilograms, the number is approximately less than ½ of the weight in pounds
    110 # = 50 kg; 220# = 100 kg; 140# = 63.6 kg
  • 13. Divided Doses
    You may have a problem that asks you to calculate the entire amount of drug that is to be given in a 24 hour period
    A problem may give you the amount of drug the client is to receive in 24 hours and ask you to calculate an individual dose
  • 14. Reconstitution of a Drug
    A problem might give you a great deal of information about reconstituting a drug – how much diluent, vial size, etc. (Kee pg. 186)
    The bottom line is to recognize the final concentration
    Order for 1.5 g of penicillin IM q6h. The pharmacy sends a vial labeled penicillin 5 g/vial in dry form. Reconstitute with 5.6 ml of sterile water to yield 1000 mg/ml. How much should be given?
  • 15. Hints for Taking Quizzes
    Read the directions completely
    Decide the unit of measure needed for the correct answer
    Read the problem again after you decide on the answer. Is the answer logical?
    Check calculations more than once on calculator
    Read the directions again
  • 16. The EndContinue with reading below
    16