Which condition is often treated with an AED?

The use of an Automated External Defibrillator (AED) is primarily associated with treating cardiac arrest. When a person experiences a cardiac arrest, their heart stops beating effectively and cannot circulate blood to the body's vital organs. This can result in a loss of consciousness and is often associated with a severe arrhythmia, typically ventricular fibrillation or pulseless ventricular tachycardia.

An AED is designed to analyze the heart's rhythm and, if necessary, deliver a shock to restore a normal rhythm. The timely use of an AED can significantly increase the chances of survival and recovery for someone experiencing a cardiac event. Other conditions listed, such as stroke, respiratory failure, and anaphylaxis, require different interventions and are not managed with the use of an AED in the same context as cardiac arrest. Thus, the use of an AED is specifically indicated for cardiac arrest situations, making it the correct response in this context.