Canadian Red Cross Standard First Aid Practice Test 2025 - Free First Aid Practice Questions and Study Guide

An Automated External Defibrillator (AED) serves the critical function of correcting underlying heartbeat problems, specifically in cases of life-threatening cardiac arrhythmias such as ventricular fibrillation or pulseless ventricular tachycardia. When a person's heart is in one of these dangerous rhythms, it cannot effectively pump blood, which can lead to cardiac arrest. The AED analyzes the heart's rhythm and, if necessary, delivers an electric shock to restore a normal heartbeat.

While the principle of resuscitation does involve restoring effective heart function, the AED does not automatically resuscitate a person. It assists by providing the necessary shock to restore normal rhythm, but further steps, including CPR, are crucial following the AED's use. Additionally, an AED does not provide oxygen to the lungs or apply pressure to the chest; those actions are part of CPR and are performed by a rescuer.