What is the primary purpose of an AED?

The primary purpose of an AED, or Automated External Defibrillator, is to deliver an electric shock to restore a normal heart rhythm in individuals experiencing a cardiac arrest. When someone suffers from certain types of arrhythmias, such as ventricular fibrillation or pulseless ventricular tachycardia, the heart is not able to pump blood effectively. The AED analyzes the heart's rhythm and, if it detects a shockable rhythm, it delivers a controlled electric shock. This shock can reset the heart's electrical activity, potentially allowing it to re-establish a normal rhythm and resume effective blood circulation.

The other options focus on different aspects of cardiac monitoring or treatment. Measuring heart rate, administering medications, and monitoring blood oxygen levels are essential components of patient assessment and care but are not the primary function of an AED. The focus of an AED is specifically on responding to life-threatening heart rhythms and aiding in resuscitation efforts.