The healthcare provider prescribes a loading dose of digoxin 0.6 mg intravenously (IV) for a client with heart failure (HF). The nurse obtains digoxin Injection 500 mcg in 2 mL vial from the electronic medication system. How many mL should the nurse administer? (Enter numeric value only. If rounding is required, round to the nearest tenth.)
The Correct Answer is ["2.4"]
The vial contains 500 mcg (or 0.5 mg) of digoxin in 2 mL.
This means that each mL contains 0.25 mg of the medication (0.5 mg / 2 mL = 0.25 mg/mL).
The nurse needs to administer 0.6 mg of the medication. To find out how many mL this is, we divide the dose by the concentration:
Volume in mL = 0.25 mg/mL 0.6 mg / 0.25 mg/mL = 2.4 mL
If rounding is required to the nearest tenth, the nurse should administer 2.4 mL of the medication.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["42"]
Explanation
Here's how to calculate the infusion rate (gtt/min) for the nurse to regulate:
1. Volume of azithromycin solution:
Volume = 500 mL (given)
2. Infusion duration:
Duration = 2 hours (given)
3. IV administration set gtt/mL:
Rate (gtt/mL) = 10 gtt/mL (given)
4. We need to find the rate (gtt/min) at which the solution should infuse to deliver the total volume (500 mL) over the specified duration (2 hours).
Steps:
a. Convert infusion duration from hours to minutes:
Duration (minutes) = Duration (hours) x Minutes per hour
Duration (minutes) = 2 hours * 60 minutes/hour
Duration (minutes) = 120 minutes
b. Calculate the total number of drops to be infused:
Total drops = Volume (mL) x Rate (gtt/mL)
Total drops = 500 mL * 10 gtt/mL
Total drops = 5,000 drops
c. Calculate the infusion rate (gtt/min):
Infusion rate (gtt/min) = Total drops / Duration (minutes)
Infusion rate (gtt/min) = 5,000 drops / 120 minutes
Infusion rate (gtt/min) = 41.67 gtt/min (round to nearest whole number as requested)
Therefore, the nurse should regulate the infusion at approximately 42 gtt/min.
Correct Answer is ["4.7"]
Explanation
Here's how to calculate the volume (mL) of the reconstituted ampicillin solution the nurse should administer for each dose:
1. We know the following:
Prescribed dose: 140 mg ampicillin (given)
Vial information:
Contains 250 mg ampicillin powder (given)
Reconstituted with 8.3 mL sterile normal saline (given)
Yields a final concentration of 30 mg/mL (given)
2. We need to find the volume (mL) of the reconstituted solution containing the prescribed dose (140 mg) considering the final concentration (30 mg/mL).
Steps:
a. Don't consider the initial volume (8.3 mL) of sterile normal saline. The final concentration (30 mg/mL) refers to the concentration in the diluted solution after adding the saline.
b. Use the following formula:
Volume to administer (mL) = Dose (mg) / Concentration (mg/mL)
c. Plug in the values:
Volume to administer (mL) = 140 mg / 30 mg/mL
Volume to administer (mL) = 4.67 mL (round to nearest tenth)
Therefore, the nurse should administer approximately 4.7 mL of the reconstituted ampicillin solution intravenously every 8 hours for the child.
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