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 ["168"]
Explanation
Here's how to calculate the total zidovudine dosage (mg) the nurse should prepare to administer:
1. Convert client weight from pounds to kilograms:
Client weight (kg) = Client weight (lb) / 2.2
Client weight (kg) = 185 lb / 2.2
Client weight (kg) = 84.1 kg (approximately)
2. Calculate the total zidovudine dose based on weight and prescribed dosage:
Dose (mg) = Dose (mg/kg) x Client weight (kg)
Dose (mg) = 2 mg/kg x 84.1 kg
Dose (mg) = 168.2 mg (round to nearest whole number as requested)
Therefore, the nurse should prepare to administer 168 mg of zidovudine.
Correct Answer is ["1"]
Explanation
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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