An AED will instruct you to stop CPR and stand clear if the patient requires an electrical shock. If the patient remains unconscious after a shock is administered, you will be instructed to resume CPR for another 2 minute cycle, until the AED again promts you to pause while it re-analyzes the patients rhythm. Continue to follow the prompts and perform CPR when indicated until emergency services arrive. This will ensure that the patient receives blood flow to vital organs while the heart is stopped.