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Discussion

Help with Dosage Calculations

Hellllppppp. Hi everyone I really need help with this dosage calculation. I have been trying to work this problem and don't know where to begin. My calculations test is tomorrow. Please help.

A 100 kg patient is receiving Dopamine @ 9ml/hr. The Dopamine that is hanging is 200 mg in 250 ml. What dose of Dopamine (mcg/kg-min) is the patient receiving? :confused:

This was a practice question that my instructor gave us, but she didn't give an answer, so I don't know if I am working the problem right or not.:uhoh3:

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    Show us what you have so far.

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    If you are using dimensional analysis, start your equation with what you are looking for (mcg/kg/min)

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    • Author

    So far I converted 200mg to 200mcg and got 200000 mcg. Then i did 200000mcg times 9ml/hr / 250ml x 60min x 100kg= 1800000/ 1500000= 1.2

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    Looks good to me.

    I find your method a little confusing but if it works for you...go with it.

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    • Author

    I have no idea if I am working it right. I normally would use dimensional anaylsis but with this problem i am just not really sure. I found that some of the IV calculations that I have been doing don't really work well with a formula.

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    I'm getting 0.0012

    200 mg/250 mL = 7.2 mg/9 mL

    7.2 mg/100 kg = 0.072 mg/1 kg

    0.072 mg/60 min = 0.0012 mg/1 min

    final answer: 0.0012 mg per 1 kg per 1 min

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    And now I see the desired answer is in mcg. Looks like we got the same answer.:smokin:

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    Hey,

    I did it dimentinal analysis also. (its the only way I know how to) and I got 1.2mcg/kg/min as well.

    9ml/1 hour

    200mg/250ml

    1person/100kg

    1hour/60mins

    1000mcg/1mg

    everything crosses out except mcg/kg/min

    (tried to post it the way i actually would on paper but it kept messing up, so I hope this makes sense to you.

    Hope this helps.

    Michele

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