A client receives a prescription for a single dose of midazolam 2 mg IV to be administer before a scheduled procedure. The vial is label, *4 mg/2 mL." How many mL should the nurse administer? (Enter numerical value only.)
The Correct Answer is ["1"]
Here's the breakdown:
Prescribed dose: 2 mg midazolam (given)
Vial concentration: 4 mg/2 mL (label)
We need to find the volume containing the 2 mg dose considering the concentration.
Calculation:
Volume (mL) = Dose (mg) / (Concentration (mg/mL) / 2)
We divide the concentration by 2 because we need the volume that delivers 2 mg (half the concentration).
Volume (mL) = 2 mg / (4 mg/mL / 2)
Volume (mL) = 2 mg / 2 mg/mL
Volume (mL) = 1 mL
Therefore, the nurse should administer 1 mL of midazolam to deliver the prescribed dose of 2 mg.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["100"]
Explanation
Here's how to calculate the infusion rate (mL/hour) for the nurse to administer cefazolin:
We know:
Total volume of solution: 50 mL (given)
Dose of cefazolin: 1 gram (given) = 1000 milligrams (since 1 gram = 1000 milligrams)
Infusion duration: 30 minutes (given) = 0.5 hours (convert minutes to hours by dividing by 60)
We need to find:
Infusion rate (mL/hour)
Calculation:
Calculate the concentration of cefazolin in the solution (not required, but helpful to understand):
We aren't directly given the concentration, but we can see that 1 gram of cefazolin is delivered in 50 mL. Therefore, the concentration is:
Concentration = Dose (mg) / Volume (mL)
Concentration = 1000 mg / 50 mL
Concentration = 20 mg/mL
Calculate the infusion rate based on the total volume and duration:
Infusion rate (mL/hour) = Total volume (mL) / Infusion time (hours)
Infusion rate (mL/hour) = 50 mL / 0.5 hours
Infusion rate (mL/hour) = 100 mL/hour
Since we typically round infusion rates to whole numbers for ease of use with infusion pumps, the nurse should program the pump to deliver 100 mL/hour.
Correct Answer is ["0.5"]
Explanation
Here's how to calculate the volume the nurse should administer after reconstituting the medication:
1. Reconstitution and Concentration:
The medication label states adding 2.5 mL of normal saline will make a solution with a concentration of 1 gram per mL. This means after reconstituting, each 1 mL of the solution will contain 1 gram of medication.
2. Dose conversion:
The client's prescription is for 500 mg. We need to convert it to grams since the concentration is in grams per mL.
Conversion: 1 gram (g) = 1000 milligrams (mg)
Prescribed dose (g) = 500 mg / 1000 mg/g
Prescribed dose (g) = 0.5 g (round to nearest tenth)
3. Calculate the volume to administer:
We know the concentration after reconstitution (1 gram/mL) and the desired dose in grams (0.5 g).
Volume to administer (mL) = Dose (g) / Concentration (g/mL)
Volume to administer (mL) = 0.5 g / 1 g/mL
Volume to administer (mL) = 0.5 mL (round to nearest tenth as requested)
Therefore, the nurse should administer approximately 0.5 mL of the reconstituted medication to the client.
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