Final answer:
Assessing the incision for any redness, swelling, or discharge is the most appropriate nursing intervention to perform 24 hours after pacemaker insertion.
Step-by-step explanation:
The most appropriate nursing intervention to perform 24 hours after pacemaker insertion is assessing the incision for any redness, swelling, or discharge. This is important because it allows the nurse to monitor for signs of infection or other complications at the surgical site. The nurse should look for any changes in the appearance of the incision, such as increased redness or swelling, and any signs of discharge that may indicate infection.