Final answer:
The nurse should insert an oropharyngeal airway to maintain an open airway immediately after the seizure. Documentation of the seizure episode should also be done for the medical record.
Step-by-step explanation:
When caring for a client who is experiencing a seizure, it is important to prioritize their safety and comfort. After turning the client's head to one side to prevent choking, the nurse should focus on maintaining an open airway and providing oxygen if necessary.
Therefore, the appropriate action for the nurse to take immediately after the seizure is Option 3: Insert an oropharyngeal airway to maintain an open airway. This will help ensure that the client can breathe properly and avoid any complications.
After providing initial care, the nurse should also document the details of the seizure episode for the medical record, which is Option 4.