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When using an Automated External Defibrillator (AED) on a patient in cardiac arrest, the sequence of events is well-defined for optimal outcomes. After attaching the pads and pressing the analyze button, the AED evaluates the patient's heart rhythm. If the AED determines that a shock is advised, it will display a "Shock advised" message. This prompts the responder to ensure that everyone is clear of the patient to avoid any accidental shocks.

Once the area is confirmed clear, defibrillation should occur to deliver the electrical shock needed to potentially restore a normal heart rhythm. Immediately after the shock is delivered, it is crucial to resume high-quality CPR to maintain blood circulation until advanced help arrives or until the patient shows signs of regaining consciousness.

After two minutes of effective CPR, a reanalysis of the patient's rhythm is necessary to assess if further shocks are required or if other interventions are needed. This sequence ensures that the patient receives the necessary defibrillation while also providing critical CPR, maximizing the chances of survival during a cardiac event.