What is the purpose of an AED in a cardiac arrest situation?

The purpose of an AED, or Automated External Defibrillator, in a cardiac arrest situation is to deliver shocks to restore a normal heart rhythm. In cases of sudden cardiac arrest, the heart may be experiencing arrhythmias such as ventricular fibrillation or pulseless ventricular tachycardia, which are life-threatening conditions that prevent the heart from effectively pumping blood. The AED works by analyzing the heart's rhythm and if necessary, delivering an electric shock to the heart. This shock can help correct the irregular rhythm and restore a functioning heartbeat, which is crucial for the survival of the patient.

Other options do not accurately reflect the role of an AED. Providing oxygen is an important aspect of emergency care but it is not the function of an AED. Assessing blood pressure and pulse are vital for evaluating a patient's condition but are not related to the primary function of an AED. Additionally, while chest compressions are life-saving techniques and should be performed in conjunction with using an AED, the AED does not replace the need for them; rather, it complements the CPR efforts.