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Discussion

math calc

I have a math problem for anyone that can help me.

I have a pt that was ordered IVIG and the dose is 1mg/kg/min

his wt is 73kg

the ordered dose is 29gm in 290ml

I need to know ml/hr do I need to run it.

I called the pham and he gave me 43ml/hr and of course that is what I went with, but I want to know how he got 43ml/hr. 3 of the nurses on my floor tried to do it and they all came up with differant answers. I know I am way over thinking this prob. Thanks for the help.

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    • Expert

    I got 43.

    1mg/kg/min. means 73mg/min. The drug is supplied 29g/290ml. That means 29000mg/290mls OR 100mg/ml.Right? You with me so far? If you are giving 73mg/min you would be giving 0.73mls /min. That works out to 43mls/hr. (0.73 x 60=43.8)

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    I got 43.

    1mg/kg/min. means 73mg/min. The drug is supplied 29g/290ml. That means 29000mg/290mls OR 100mg/ml.Right? You with me so far? If you are giving 73mg/min you would be giving 0.73mls /min. That works out to 43mls/hr. (0.73 x 60=43.8)

    That is the number I got, but would you not round up?
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    • Expert

    I would I guess.I'm was wondering why the pharmacist rounded down.

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    Running it at 43 vs 44 mL/hr is unlikely to make much of a difference. With an rate of 43.8 mL/hr, I would round up to 44 mL/hr.

    I'm used to having to taper IVIG up over the course of 2 hours though and not just having a set rate to run it at. When I worked in the hospital, IVIG was typically given as 2g/kg separated over 2 days. You started at 0.5 mL/kg/hr x 30 minutes, then 1 mL/kg/hr x 30 min, then 2 mL/kg/hr x 30 min then 3 mL/kg/hr x 30 min and then you got up to 4 mL/kg/hr and that was your rate for the remainder of the infusion.

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    • Author

    I did give it at 44ml/hr, I gave it at the steady rate because that was the Dr's orders. He wanted me to give 1mg/kg/hr once a day for 5 days.

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