PLEASE HELP!!! Pediatric Dosage Calc.

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I'm having a very hard time right now trying to think and I can't figure out simple problems. I have my final dosage calc exam tomorrow can someone please help me answer this question:

1.Order: nafcillin 900mg IVPB q6h.

Recommended dose: 100-200 mg/kg/day in divided doses every 6 hours to be infused over 20 minutes

Supplied: 100mg/ml Patient weighs 59lbs If this is a safe dose, at what rate will you set the IV pump (round answer to the nearest tenth.)

My answer (Not completed)

Weight: kg=1kg/2.2lbx59lbs/1= 26.818 ----> 26.82kg

Dose: 900mg IVPB q6h Rec: 100-200mg/kg/day 100x26.82=2,682 mg/day (low dose)

200x26.82=5364 mg/day (max dose)

Safe?: Yes, it is 3600mg/day

Answer: 1ml/100mgx900/1=9ml (This is where I stopped at and always get stuck!!!) I need to find the ml/hr.......?????

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Specializes in NICU.

Which tubing are you going to use?

A 10 gtts/mL

B 15 gtts/mL

C 60 gtts/mL

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Specializes in Pediatric Pulmonary.

So you've figured out that you are infusing 9ml, and your orders state to infuse over 20 minutes.

Your pump needs to be programmed ml per hour.

So 9 ml over 20 minutes is how many ml over 60 minutes?

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So, your dose is 9ml q 6hrs....did I read it right?

9ml/6hrs=x ml/1hr

You are so close!

Also, this is a ml/hr pump calc, not a gtts/min drip calc, right Don1984?

Edit* I didnt catch the "over 20 min part" sorry! Ill call this an RTFQ mistake. (Read the freakin question)

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The flow rate is always in mL/hr. So, you need to do the calculation to get your current flow rate of 9mL/20 mins to mL/hr

20mins x 3 = 60 mins (1hr) and 9mL x 3 = 27 mL So, your answer is 27mL/hr

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Specializes in Critical Care, ED, Cath lab, CTPAC,Trauma.

does the question specify how much to mix the Nafcillin in ?

If it is just the 9mls

Then you will infuse the 9mls over 10-20 mins...which is the standard if you look the drug up for peds.[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]

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Specializes in NICU.

Also, this is a ml/hr pump calc, not a gtts/min drip calc, right Don1984?

You are right. I am so used to the tricky peds dosage drip rates that you need to use the micro drip instead of macro drip.

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You got it all right until the very end where you got a brain cramp :)

You need to give 9cc over 20 minutes. So if that ran for 60 minutes, you'd be giving 27cc, right? So your rate is 27cc/hour. Remember, you're not going to give it at that rate for an hour, because the dose you want to give is only 1/3 of what that would be, so you'd only run it for ... 20 minutes. 900mg. Done. :)

Sometimes it's useful to sketch a little picture to help you visualize amounts and times. Draw a clock face, then shade in the 20 minutes and label that "900mg." Now can you see that a full hour would be 2700mg? But if you run it that fast for only 20 minutes you give 900mg?

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Do you know you confuse us when you post the exact same question to two different fora?

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Specializes in Nephrology, Cardiology, ER, ICU.

Merged two threads for continuity.

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Thank y'all so much for y'all help the answer was 27ml/hr. I see how to fully do the equation now!!!!

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Specializes in Pedi.
Do you know you confuse us when you post the exact same question to two different fora?

All I see is this:

Which tubing are you going to use?

A 10 gtts/mL

B 15 gtts/mL

C 60 gtts/mL

I'm confused.

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