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A nurse is caring for a client who has status epilepticus. The provider prescribes phenobarbital 400 mg IV bolus stat, then 200 mg IV bolus every 20 min until seizure activity stops, maximum 2 g. Available is phenobarbital injection 130 mg/mL. How many mL should the nurse administer per dose after the initial dose?
(Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
Answer and Explanation

The Correct Answer is ["1.5"]

To calculate the amount of phenobarbital injection needed for each dose after the initial  dose, we need to divide the prescribed dose (200 mg) by the concentration of the  injection (130 mg/mL). This gives us: 

200 mg / 130 mg/mL = 1.538 mL 

To round this to the nearest tenth, we look at the hundredths place and see that it is 3,  which is less than 5, so we round down and drop the rest of the digits. This gives us: 

1.5 mL 

Therefore, the nurse should administer 1.5 mL of phenobarbital injection per dose after  the initial dose. 


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Related Questions

Correct Answer is ["30"]

Explanation

To solve this problem, the nurse needs to convert the client's weight from pounds to kilograms, and then use the formula:

mL/hr = (mcg/kg/min x kg x 60 min) / (mg/mL x 1000 mcg/mg)

The client's weight in kilograms is:

110 lb / 2.2 lb/kg = 50 kg

The concentration of dobutamine in mg/mL is:

250 mg / 250 mL = 1 mg/mL

Plugging these values into the formula, we get:

mL/hr = (10 mcg/kg/min x 50 kg x 60 min) / (1 mg/mL x 1000 mcg/mg) mL/hr = (30,000 mcg/min) / (1000 mcg/mg)

mL/hr = 30 mg/min

mL/hr = 30 mL/hr

Therefore, the nurse should set the IV pump to deliver 30 mL/hr.

Correct Answer is ["15"]

Explanation

To answer this question, we need to calculate the dose of esmolol in mcg/kg/min, then convert it to mg/hr, and then use the formula:

mL/hr = (dose in mg/hr) x (volume in mL) / (concentration in mg)

First, we convert the client's weight from pounds to kilograms:

110 lb x 1 kg / 2.2 lb = 50 kg

Next, we multiply the client's weight by the prescribed dose to get the dose in mcg/min: 50 kg x 50 mcg/kg/min = 2500 mcg/min

Then, we divide the dose in mcg/min by 1000 to get the dose in mg/min: 2500 mcg/min / 1000 = 2.5 mg/min

Finally, we multiply the dose in mg/min by 60 to get the dose in mg/hr: 2.5 mg/min x 60 = 150 mg/hr

Now, we can use the formula to find the infusion rate in mL/hr:

mL/hr = (150 mg/hr) x (250 mL) / (2500 mg)

mL/hr = 15

Therefore, the nurse should set the IV pump to deliver 15 mL/hr.

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