An Automated External Defibrillator (AED) is primarily used in cases of sudden cardiac arrest. This medical emergency occurs when the heart unexpectedly stops beating or develops an irregular rhythm, which disrupts its ability to pump blood to vital organs. The AED is designed to quickly analyze the heart's rhythm and, if necessary, deliver an electric shock to restore a normal heart rhythm.
In situations of sudden cardiac arrest, the prompt use of an AED can significantly increase the chances of survival, especially when it is used within the first few minutes of the event. As such, recognizing the critical role of an AED in this specific scenario is essential for effective emergency response and maximizing patient outcomes. Other scenarios, like severe allergic reactions, severe bleeding, or heat exhaustion, require different medical interventions and do not directly involve the use of an AED.