Emergency IV calculation! HELP PLEASE!

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This is my problem:

Mannitol IV infusion: 0.5g/kg in a 20% solution ovef 20 minutes

IV supply: 250 and 500 ml of 20% for IV infusion (200mg/ml)

What is the ml/hr?

Any assistance is greatly appreciated!

Thanks!

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Specializes in ED.

how much does the person weigh?

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oops 175 lbs= 79.54 kg

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Specializes in Anesthesia.
This is my problem:

Mannitol IV infusion: 0.5g/kg in a 20% solution ovef 20 minutes

IV supply: 250 and 500 ml of 20% for IV infusion (200mg/ml)

What is the ml/hr?

Any assistance is greatly appreciated!

Thanks!

I see that the pt weighs approx. 80kg according to your other post.

80kg pt (0.5g/kg)=40g

40g/0.2g(the concentration)=200ml needed

200ml over 20min=600ml/hr

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I don't agree with you. I had a nurse that does figuring like this all the time and she got 199/hr

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Specializes in Anesthesia.
I don't agree with you. I had a nurse that does figuring like this all the time and she got 199/hr

Then show me where I am wrong.....I can always be wrong, but I think your calculation didn't figure in that it was to be given over 20minutes which would triple your figure.....As far as the 199 vs 200 I am sure the difference is in that I rounded the pt's wt up.

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She figured it over 20 minutes???? What is the right answer? Let me know, I am curious. It just seems unrealistic to run in mannitol at 600cc/hr.

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Specializes in Anesthesia.
She figured it over 20 minutes???? What is the right answer? Let me know, I am curious. It just seems unrealistic to run in mannitol at 600cc/hr.

You only giving it as a bolus/one time dose which is fairly common. I am assuming with this dose over this amount of time it is for reduction of ICP/neurological reasons. When I am doing anesthesia for cranis this is fairly common although I usually run it over 30min. http://www.rxlist.com/mannitol-iv-drug.htm I am still coming up with 600ml/hr.

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Specializes in Emergency Department.

40 g needed (0.5g/kg 80lb pt)

converted to

40000mg

have 200mg Xml

200ml/hr

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Specializes in Emergency Department.

opps I forgot the over 20 min part.

200ml over 20 min would make 600ml/hr

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Specializes in Anesthesia.
40 g needed (0.5g/kg 80lb pt)

converted to

40000mg

have 200mg Xml

200ml/hr

200ml needed: given over 20mins=600ml/hr

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Specializes in being a Credible Source.

wtbcrna is correct... it's 600 mL/hr

(500 mg/kg) x (79.5 kg) x (1 mL/200 mg) x (1 / 20 min) x (60 min/1 hr)

That is, 200 mL given over 20 minutes = 600 mL/hr.

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