Final answer:
The shock button on an AED should be pressed after the AED analyzes the victim's heart condition.
Step-by-step explanation:
The shock button on an AED should be pressed after the AED analyzes the victim's heart condition. Automated External Defibrillators (AEDs) are designed to automatically diagnose the patient's heart rhythm and then apply the shock with appropriate energy and waveform. CPR (Cardiopulmonary Resuscitation) is recommended before using an AED in many cases.