A nurse is caring for a client who recently had surgery for insertion of a permanent pacemaker. Which of the following prescriptions should the nurse clarify?

After permanent pacemaker insertion, the nurse must clarify a prescription for an MRI of the chest because this is contraindicated in most clients with permanent pacemakers. The strong magnetic fields generated by MRI machines can interfere with pacemaker programming, induce currents that cause inappropriate pacing or inhibition, generate heat at the lead tips, and potentially move or dislodge the device. While MRI-conditional pacemakers now exist, the default safety rule requires verification that the specific device is MRI-compatible before any MRI is performed. The nurse must bring this prescription to the provider's attention for clarification before it is carried out. Physical therapy is appropriate after pacemaker insertion and does not pose a risk once the device is stable. Serum cardiac enzyme levels are routinely obtained postoperatively to monitor for myocardial injury and are safe. A low-sodium diet is a standard cardiac prescription that does not interact with pacemaker function. The MRI prescription stands out as the one requiring clarification because of the well-established safety contraindication, making it the only option that the nurse should question and not carry out without further provider guidance and confirmation of device compatibility.