Final answer:
To administer the required 0.125 mg dose of digoxin IV bolus when the available concentration is 0.25 mg/ml, the nurse should administer 0.5 ml of the digoxin injection.
Step-by-step explanation:
A nurse is preparing to administer digoxin 0.125 mg IV bolus stat. The availability of the digoxin injection is 0.25 mg/ml. To calculate how many ml the nurse should administer, we can use a simple ratio and proportion:
Dose ordered: 0.125 mg Available dose: 0.25 mg/ml
Now, set up the equation based on the ratio of available dose to the desired dose:
0.25 mg/ml = 0.125 mg/x ml
Multiply both sides by x ml and divide by 0.25 mg to solve for x:
x ml = 0.125 mg / 0.25 mg/ml
x = 0.5 ml
Therefore, the nurse should administer 0.5 ml of the digoxin injection.