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 ["1.5"]
Explanation
Understanding the Problem:
We need to administer 15 mg of furosemide.
The available ampoule contains 10 mg/mL of furosemide.
Solution:
Set up a proportion:
We want to find the number of milliliters (mL) needed.
We know the desired dose (15 mg) and the concentration of the medication (10 mg/mL).
Proportion:
x mL / 15 mg = 1 mL / 10 mg
Cross-multiply:
10x = 15
Solve for x:
x = 15 / 10
x = 1.5
Therefore, the nurse should administer 1.5 mL of furosemide.
Correct Answer is ["160"]
Explanation
To prepare a 4-hour solution of Osmolite® 1/2 strength enteral formula at 80 ml/hour, the nurse will need to dilute the full-strength formula with a certain amount of water.
Step 1: Calculate the total volume of the 1/2 strength formula needed for 4 hours:
Total Volume = Infusion Rate (mL/hour) x Infusion Time (hours)
Total Volume = 80 mL/hour x 4 hours
Total Volume = 320 mL
Step 2: Determine the volume of full-strength Osmolite® needed:
Since the desired solution is 1/2 strength, we need to dilute the full-strength formula by half.
Volume of Full-Strength Osmolite® = Total Volume / 2
Volume of Full-Strength Osmolite® = 320 mL / 2
Volume of Full-Strength Osmolite® = 160 mL
Step 3: Calculate the volume of water needed to dilute the full-strength Osmolite®:
Volume of Water = Total Volume - Volume of Full-Strength Osmolite®
Volume of Water = 320 mL - 160 mL
Volume of Water = 160 mL
Therefore, the nurse should dilute the full-strength Osmolite® with 160 mL of water to prepare a 4-hour solution.
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