A nurse is preparing to administer lidocaine 4 mg/min by continuous IV infusion. Available is lidocaine 1 g in dextrose 5% in water 250 ml. The nurse should set the IV pump to deliver how many mL/hr?
(Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

Answer and Explanation

The Correct Answer is ["60"]

To calculate the infusion rate of lidocaine, we need to convert the dose from mg/min to mg/hr and then to mL/hr.

The prescribed dose is 4 mg/min, so the hourly dose is 4 x 60 = 240 mg/hr.

The concentration of the drug is 1 g in 250 mL, which is equivalent to 1000 mg in 250 mL or 4 mg in 1 mL.

Therefore, the volume per hour is 240 / 4 = 60 mL/hr.

Rounded to the nearest whole number, the nurse should set the IV pump to deliver 60 mL/hr.

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Correct Answer is B

Explanation

A. The medication is for IV administration: This cannot be assumed unless the label specifically states “for intravenous use.” Phenytoin comes in multiple formulations (oral suspension, tablets, IV), so route must be verified.
B. The total amount available per container is 4 mL: This is label-specific information. If the label indicates that each vial contains 4 mL, this is a factual and critical point to ensure accurate dosing.
C. The nurse should avoid shaking the medication: While some medications (e.g., suspensions) should not be shaken vigorously, phenytoin IV solution is not a suspension, and this instruction may not apply to all forms.
D. The medication should not be stored below 30°C (86°F): This is incorrect. Phenytoin should be stored at controlled room temperature, typically 20°C to 25°C (68°F to 77°F), and protected from excessive heat or cold.

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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Naxlex Comprehensive Predictor Exams

A nurse is preparing to administer phenytoin. Which of the following information should the nurse identify as correct according to the medication label?

Correct Answer is B

Explanation

Correct Answer is ["15"]

Explanation

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