What is one action that should be completed on the dialysis machine after a patient experiences a cardiac arrest?

After a patient experiences a cardiac arrest, it is crucial to ensure that the dialysis machine is functional and safe for subsequent use. Performing a functional test on the machine is essential to confirm that all systems are operating correctly and that no damage or malfunction has occurred during the event. This step helps in assessing the integrity of the machine and ensuring that it can safely provide treatment to future patients.

The other actions listed do not directly address the immediate need to verify the machine's operational status. For instance, sanitizing the machine is an important part of infection control but is not the priority in this situation. Changing all filters is unnecessary unless there is a known problem with them or they are scheduled for replacement. Documenting the event is important for records and accountability but does not influence the immediate safety or functionality of the machine.