anesthesia and math....

  1. [FONT="Comic Sans MS"]
    Greetings CRNA folk...
    As an SRNA, we just went over the 'math' of epi doses/concentrations.
    I am still a little 'in the woods' on this concept and was wondering if ya'll had some thoughts/advice on the topic.
    thanks to all.
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    About ECU_CRNA2B

    Joined: Aug '05; Posts: 44; Likes: 2

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  3. by   Businessman
    I'll try to simplify the concepts:
    Always use the int'l units of measure (kg and liters). If you're using mL, then you should be using grams.

    Q: How many miligrams of Lido are found in 40 mL of a 1% solution?
    A: 0.4 grams

    1% solution => 1 gram of Lido for every 100 mL of solution.

    Q: A pt has an order for 200 mL of a 2% Lido solution. How many mgs of lido are contained in this order?
    A: 4000 mgs.

    2% solution => 2 gms for each 100 mL => 4 gms for 200 mL.
    The problems asks for mgs. 4 gms = 4000 mgs.

    Q: You have 2 mL of Epi 1:10,000. How many miligrams of Epi are contained in this solution?
    A: 0.2 mgs.

    1:10000 = there's 1 gram of epi for each 10,000 mL of solution.
    In 2 mL you'll have 2/10,000 grams, or 0.0002 grams.
    The problem asks for miligrams, so you multiply the grams by 1,000.

    Good luck.

    Any more questions, give me a holler. I'm an ex-engineer...

    Look on the web for more problems.
    I say I have to make no mistakes with such problems, at 2:00 am, after 5 beers... that's how important I think it is. A digit mistake means serious complications with my patient.
  4. by   heartICU
    Quote from ECU_CRNA2B
    Greetings CRNA folk...
    As an SRNA, we just went over the 'math' of epi doses/concentrations.
    I am still a little 'in the woods' on this concept and was wondering if ya'll had some thoughts/advice on the topic.
    thanks to all.
    The easiest way for me to remember the concentrations:

    all are a factor of one million. For example, an epi concentration of 1:100,000...how many times does 100,000 go into one million? Ten times, therefore 10mcg/mL.

    Epi 1:200,000....goes into one million five times, 5 mcg/mL. And it continues for 1:1000, 1:10,000, etc.

    Make sense?

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