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 ["12000"]
Explanation
Here's how to calculate the total heparin units the client will receive in 12 hours
Heparin concentration:
The medication is delivered in a 500 mL bag containing 20,000 units of heparin.
Heparin concentration (units/mL) = Total heparin (units) / Volume (mL)
Heparin concentration (units/mL) = 20,000 units / 500 mL
Heparin concentration (units/mL) = 40 units/mL
Infusion rate: 25 mL/hour (given)
Time: 12 hours (given)
We need to find the total number of heparin units delivered in 12 hours.
Total volume delivered in 12 hours:
Volume delivered (mL/hour) x Time (hours) = Total volume delivered (mL)
25 mL/hour x 12 hours = 300 mL
Total heparin units delivered:
Heparin concentration (units/mL) x Total volume delivered (mL) = Total heparin units
40 units/mL x 300 mL = 12,000 units
Therefore, the client will receive 12,000 units of heparin in 12 hours.
Correct Answer is ["120"]
Explanation
Here's how to calculate the rate (mL/hour) for the infusion pump to deliver lidocaine 4 mg/minute:
1. Lidocaine concentration:
The medication bag contains 1 gram of lidocaine in 500 mL of dextrose 5% in water.
Convert grams to milligrams: 1 gram = 1000 milligrams
Lidocaine concentration (mg/mL) = Total lidocaine (mg) / Volume (mL)
Lidocaine concentration (mg/mL) = 1000 mg / 500 mL
Lidocaine concentration (mg/mL) = 2 mg/mL (round to nearest whole number)
2. Prescribed lidocaine dose: 4 mg/minute (given)
3. We need to find the volume delivered per hour (mL/hour) to achieve the prescribed lidocaine dose (4 mg/minute) considering the concentration (2 mg/mL) in the bag.
Infusion rate (mL/hour) = Dose (mg/minute) x Minutes per hour / Concentration (mg/mL)
However, there's a mismatch in units between dose (mg/minute) and concentration (mg/mL).
To address this, we can convert the infusion duration (minutes) to hours to match the concentration units (mg/mL).
Conversion factor: 60 minutes/hour
Infusion rate (mL/hour) = Dose (mg/minute) x (60 minutes/hour) / Concentration (mg/mL)
Infusion rate (mL/hour) = 4 mg/minute * 60 minutes/hour / 2 mg/mL
Infusion rate (mL/hour) = 120 mL/hour (round to nearest whole number)
Therefore, the nurse should program the infusion pump to deliver approximately 120 mL/hour.
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