Final answer:
The correct intervention required when the nurse has applied elbow splints on a confused client to prevent the client from removing the intravenous (IV) line is to document the appearance of the client's IV site every hour.
Step-by-step explanation:
The correct intervention required when the nurse has applied elbow splints on a confused client to prevent the client from removing the intravenous (IV) line is to document the appearance of the client's IV site every hour. This is important to monitor for any signs of infection or other complications.
Removing the elbow splints every 8 hours (option 2) is not necessary as it could remove the protection provided by the splints and potentially lead to the client removing the IV line.
Asking for renewal of a prescription for restraint every 72 hours (option 3) is not applicable in this situation as elbow splints are not considered as restraints.
Assessing and documenting the client's condition at least every hour (option 4) is a good practice, but the primary intervention specifically related to the IV line is to document the appearance of the IV site every hour.