Final answer:
The priority nursing intervention is taking the client's apical pulse for 1 full minute before drug administration. Captopril is an ACE inhibitor that can cause a decrease in heart rate, so it is important to assess the client's heart rate prior to administration.
Step-by-step explanation:
The priority nursing intervention is a. Take the client's apical pulse for 1 full minute before drug administration. Captopril is an angiotensin converting enzyme (ACE) inhibitor, and one common side effect is a decrease in heart rate and blood pressure. Therefore, it is important for the nurse to assess the client's heart rate before administering the medication. By taking the apical pulse for 1 full minute, the nurse can accurately assess the client's heart rate and detect any bradycardia (slow heart rate) that may require intervention.