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Discussion

Please Help Me!

The doctor ordered Vancomycin 10mg/kg IVPB every 8 hours for infection. The patient's

weighs 20 lbs. The nursing drug reference states: dilute each 500 mg vial with 10 mL of sterile water for injection and further dilute in 100 mL of NS to infuse over 1 hour.

48. How many milliliters will you draw from the vial after reconstitution?

Answer 1.8 mL

49. Calculate the milliliters per hour to set the IV pump.

Answer 100 mL/hr

50. Calculate the drops per minute with a drop factor of 10 gtt/mL

Answer 16 -17 gtts

51. The doctor ordered one unit of PRBC to infuse in 3 hours. The unit of blood is

labeled 275 ml. At what flow rate will you set the IV pump?

Answer 91 -92 mL/hr

I am studying for my dosage calc test , I came across this problem and I have no idea where to begin. I'm not looking for answers just an explanation as to why these answers are correct and how to reach these answers on my own . Please help me!!

  • Quote

    • Featured Replies

    How do you set up any of the dosage calculation problems that you have worked before? What information do you know? What information are you trying to figure out? Are all your units correct or do you need to convert (eg need Xmg/kg/day and weight is in lbs so need to convert lbs to kg)? Start there...

  • Quote
    • Author

    First I would convert 20lbs to kg which is 9.09 kg. so 10mg/kg would be 91 mg every 8 hours . That's about as far as I can get . I'm totally lost .

  • Quote
    • Author

    Ok so I came up with this . 90mg/500mg x 10ml= 1.8 mL. Is this correct ?

  • Quote
    • Experts

    Yes that is correct. So if you add 1.8ml to 100ml 0.9ns what do you set the pump at to deliver 100mls over 1 hour.

    [TABLE=class: fraction]

    [TR]

    [TD=class: numerator]Volume (mL) = Y (Flow Rate in mL/hr)

    [/TD]

    [/TR]

    [TR]

    [TD=class: denominator] Time (hr) [/TD]

    [/TR]

    [/TABLE]

  • Quote
    • Experts

    [TABLE=class: formula]

    [TR]

    [TD][TABLE=class: fraction]

    [TR]

    [TD=class: numerator]Volume (mL)

    [/TD]

    [/TR]

    [TR]

    [TD=class: denominator] Time (min) [/TD]

    [/TR]

    [/TABLE]

    [/TD]

    [TD] x Drop Factor (gtts/mL) = Y (Flow Rate in gtts/min)

    [/TD]

    [/TR]

    [/TABLE]

    So for how many gtts using 10 gtt tubing.

  • Quote
    • Experts

    The last one uses the same formula

    Volume (mL) = Y (Flow Rate in mL/hr)

    Time (hr)

  • Quote
    • Author

    Ok for the gtts I got 100ml/60 min x10gtts = 16.66 so 17 gtts

  • Quote
    • Author

    I'm still confused on how to get mL/hr.

  • Quote
    I'm still confused on how to get mL/hr.

    Go back a step and don't drop your unit labels. If you keep your labels on, you should be able to see which steps still need to be done to get what you need.

  • Quote
    • Experts

    There are many way to got the answer. If you have 275mls to go equally over 3 hours. Divide 275 by 3.

    Volume (mL) = Y (Flow Rate in mL/hr)

    Time (hr)

    or use the same formula.

    [TABLE=class: cms_table_fraction]

    [TR]

    [TD=class: cms_table_numerator]Volume (mL) x Drop Factor (gtts/mL) = Y (Flow Rate in gtts/min)

    [/TD]

    [/TR]

    [TR]

    [TD=class: cms_table_denominator] Time (min)[/TD]

    [/TR]

    [/TABLE]

    First how many min is in 3 hours ....

    60min x 3hr =____min

    1hr ?min

    then use this formula. Your drop factor for this is under stood micro drop tubing or 60gtt/ml

    [TABLE=class: cms_table_fraction]

    [TR]

    [TD=class: cms_table_numerator]Volume (mL) x Drop Factor (gtts/mL) = Y (Flow Rate in gtts/min)

    [/TD]

    [/TR]

    [TR]

    [TD=class: cms_table_denominator] Time (min)[/TD]

    [/TR]

    [/TABLE]

  • Quote

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