What is the function of an automated external defibrillator (AED)?

An automated external defibrillator (AED) is specifically designed to analyze the heart's rhythm and deliver an electrical shock to restore a normal heart rhythm in cases of sudden cardiac arrest. The correct answer highlights that the primary function of an AED is to externally shock the heart when it detects certain lethal heart rhythms, such as ventricular fibrillation or pulseless ventricular tachycardia. This life-saving shock can help re-establish effective heartbeats and improve the chances of survival for the victim.

The other choices describe different medical functions that are not pertinent to the role of an AED. For example, monitoring heart activity is typically the role of an electrocardiogram (ECG), while administering medications is done by healthcare professionals using various devices or methods, and measuring blood pressure typically requires a sphygmomanometer, not an AED. Thus, the function of an AED is clearly distinct from these other medical devices and interventions.