The health-care provider prescribes an intermittent infusion of nafcillin (Unipen) 800 mg IV for a pediatric client. The drug is dispensed in a concentration of 250 mg/ml, and the recommended infusion concentration is 40 mg/ml. When adding the prescribed dose to the volume control device, how many ml of IV solution should the nurse add to dilute? (Enter numeric value only. If rounding is required, round to the nearest tenth.)
The Correct Answer is ["16.8"]
To calculate the volume of IV solution needed to dilute the nafcillin, we'll follow these steps:
Step 1: Calculate the total volume of the diluted solution:
Desired Concentration (mg/mL) = Prescribed Dose (mg) / Total Volume (mL)
Rearranging the formula to solve for Total Volume:
Total Volume (mL) = Prescribed Dose (mg) / Desired Concentration (mg/mL)
Total Volume = 800 mg / 40 mg/mL
Total Volume = 20 mL
Step 2: Calculate the volume of nafcillin solution to be added:
Volume of Nafcillin Solution = Prescribed Dose (mg) / Concentration of Nafcillin (mg/mL)
Volume of Nafcillin Solution = 800 mg / 250 mg/mL
Volume of Nafcillin Solution = 3.2 mL
Step 3: Calculate the volume of IV solution needed to dilute:
Volume of IV Solution = Total Volume - Volume of Nafcillin Solution
Volume of IV Solution = 20 mL - 3.2 mL
Volume of IV Solution = 16.8 mL
Therefore, the nurse should add 16.8 mL of IV solution to the volume control device to dilute the nafcillin.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["5.8"]
Explanation
To calculate the infusion rate, we'll follow these steps:
1. Calculate the desired dose rate in mcg/minute:
Desired Dose Rate = Weight (kg) x Dose (mcg/kg/minute)
Desired Dose Rate = 86 kg x 8 mcg/kg/minute
Desired Dose Rate = 688 mcg/minute
2. Convert micro-grams to milligrams:
688 mcg x (1 mg / 1000 mcg) = 0.688 mg/minute
3. Calculate the concentration of dopamine in the IV solution:
Dopamine Concentration = Dopamine (mg) / Solution Volume (mL)
Dopamine Concentration = 800 mg / 500 mL
Dopamine Concentration = 1.6 mg/mL
4. Set up a proportion:
x mL/hour / 0.688 mg/minute = 60 minutes/hour / 1.6 mg/mL
5. Cross-multiply and solve for x:
x mL/hour = 0.688 mg/minute x 60 minutes/hour / 1.6 mg/mL
x mL/hour ≈ 25.8 mL/hour
Therefore, the nurse should program the infusion pump to deliver approximately 25.8 mL/hour.
Correct Answer is ["2"]
Explanation
To calculate the number of additional tablets needed, we'll first determine the total number of tablets required for the new dose of 20 mg.
Step 1: Calculate the total number of tablets needed for the new dose:
Total Tablets = Desired Dose (mg) / Tablet Strength (mg)
Total Tablets = 20 mg / 5 mg/tablet
Total Tablets = 4 tablets
Step 2: Determine the number of tablets already administered:
The nurse administered 10 mg, which is equivalent to 2 tablets (since each tablet is 5 mg).
Step 3: Calculate the number of additional tablets needed:
Additional Tablets = Total Tablets - Tablets Already Administered
Additional Tablets = 4 tablets - 2 tablets
Additional Tablets = 2 tablets
Therefore, the nurse should administer 2 additional tablets of benazapril to reach the new prescribed dose of 20 mg.
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