Final answer:
Before defibrillating a client, the nurse must ensure the safety of all personnel by making sure they are clear of contact with the client and the bed.
Step-by-step explanation:
Before defibrillating a client during resuscitation, the nurse must ensure that all personnel are clear of contact with the client and the bed. This is because defibrillation delivers a large charge of electrical energy, and anyone touching the client during this process could also be shocked. Ensuring the safety of all personnel is the top priority before proceeding with defibrillation.