Step-by-step explanation:
A) Heart rate of 60 beats per minute
The nurse should withhold the administration of digoxin if the client has a heart rate of 60 beats per minute. Digoxin is a medication commonly used to treat various heart conditions, including heart failure and certain arrhythmias. However, it is primarily indicated for conditions associated with a slower heart rate. A heart rate of 60 beats per minute is considered within the normal range for adults, and administering digoxin in this case may further slow down the heart rate, potentially causing bradycardia or other adverse effects.
Serum potassium level of 4.0 mEq/L (B) is within the normal range and does not require withholding digoxin. An ECG showing normal sinus rhythm (C) indicates a normal heart rhythm and does not warrant withholding the medication. A serum digoxin level within the therapeutic range (D) indicates that the medication is being appropriately absorbed and utilized by the body and does not necessitate withholding the medication.