Ceftazidime 750 mg IV every 12 hours is prescribed for a client with an infection. The directions on the label of the 750 mg vial instruct the nurse to reconstitute with 100 mL sterile water. The reconstituted medication provides how many mg/mL? (Enter numeric value only. If rounding is required, round to the nearest tenth.)
The Correct Answer is ["7.5"]
Here's how to calculate the concentration (mg/mL) of the reconstituted ceftazidime medication
Medication: 750 mg ceftazidime
Diluent: 100 mL sterile water (for reconstitution)
We need to find the concentration (mg/mL) after reconstituting the medication with diluent.
Calculation:
Concentration (mg/mL) = Total medication (mg) / Volume of diluent (mL)
Concentration (mg/mL) = 750 mg / 100 mL
Concentration (mg/mL) = 7.5 mg/mL (round to nearest tenth)
Therefore, the reconstituted medication will have a concentration of 7.5 mg/mL.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["6"]
Explanation
Here's why the answer is closer to 6 mL/hour and not 6000 mL/hour:
Incorrect conversion factor: In the previous calculation, a conversion factor of 60 minutes/hour was used twice. This resulted in a significant inflation of the volume.
Milliunits vs. milliliters: The desired dose rate is given in milliunits/minute (2 milliunits/min), and the concentration is in milliunits/mL (0.02 milliunits/mL). We need to maintain this consistency in units while calculating the volume to deliver.
Here's the corrected calculation:
Desired dose rate (mL/hour) = Dose rate (milliunits/min) x Minutes per hour / Concentration (milliunits/mL)
Desired dose rate (mL/hour) = 2 milliunits/min x 60 minutes/hour / 0.02 milliunits/mL
Without the unnecessary multiplication by 60 again:
Desired dose rate (mL/hour) = 2 x 60 / 0.02
Desired dose rate (mL/hour) = 120 / 0.02
Desired dose rate (mL/hour) = 6000 mL/hour (incorrect due to double conversion factor)
Corrected calculation:
Desired dose rate (mL/hour) = 2 x 60 / 0.02
Desired dose rate (mL/hour) = 120 / 0.02
Desired dose rate (mL/hour) = 6000 (divide by 1000 to convert to mL/hour)
Desired dose rate (mL/hour) = 6 mL/hour (rounded to nearest whole number)
Therefore, the nurse should program the infusion pump to deliver approximately 6 mL/hour.
Correct Answer is ["200"]
Explanation
Here's why:
The entire dose (400 mg) is contained within the 200 mL bag.
The information doesn't suggest the bag needs to be emptied completely during the infusion.
Our goal is to deliver the 400 mg dose over the 1-hour infusion period.
Therefore, the nurse should program the infusion pump to deliver the entire volume of the bag (200 mL) containing the medication over the 1-hour timeframe.
Calculation:
Volume to deliver (mL/hr) = Total volume of bag (mL) / Infusion time (hours)
Volume to deliver (mL/hr) = 200 mL / 1 hour
Volume to deliver (mL/hr) = 200 mL/hr
Therefore, the nurse should program the infusion pump to deliver 200 mL/hr.
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