Are automated external defibrillators (AEDs) safe for use by untrained individuals in cases of sudden cardiac arrest?
Yes, automated external defibrillators (AEDs) are designed to be safe and effective for use by untrained individuals during cases of sudden cardiac arrest. These devices provide step-by-step voice instructions that guide the user through the entire process. They are also programmed to deliver an electric shock only if they detect a dangerous heart rhythm disturbance that requires it, which prevents the delivery of a shock to a person who may have lost consciousness for a reason other than cardiac arrest [1].
How do automated external defibrillators (AEDs) work?
AEDs function by analyzing the heart's electrical activity and determining whether there is a heart rhythm disturbance that requires an electric shock to return to a normal rhythm [1]. In the event of sudden cardiac arrest, the heart stops beating abruptly, which halts blood flow to the brain and other vital organs. If not treated quickly, cardiac arrest usually leads to death within minutes [1]. An AED delivers an electric shock that can restore a normal rhythm to a heart that has stopped beating [1].
These devices are designed for ease of use, providing the user with clear voice prompts on how to place the electrodes and operate the device [1]. These instructions make them suitable for use by anyone who witnesses a sudden cardiac arrest, even if they have no prior medical training [3].
The importance of immediate AED use
Sudden cardiac arrest is a medical emergency that requires immediate treatment. Every minute that passes without treatment reduces the chances of survival [2]. Cardiopulmonary resuscitation (CPR) must be started immediately and continued until an AED is ready to use [1]. CPR helps maintain blood flow to the brain and other organs until the heart's rhythm is restored [1].
The presence of AEDs in public places such as schools, businesses, and airports significantly increases the chances of saving lives [1]. If you see someone you suspect is suffering from sudden cardiac arrest, you must call emergency services immediately and begin CPR until an AED becomes available [2]. For more information on sudden cardiac arrest and the importance of immediate first aid, you can visit Sudden Cardiac Arrest: Causes, Warning Signs, and the Importance of Immediate First Aid (Arabic).
When should an AED be used?
An AED should be used when a person suddenly collapses, loses consciousness, and is not breathing normally [4]. These are the main signs of sudden cardiac arrest. It is important to note that an AED will not deliver a shock if it does not detect a heart rhythm disturbance requiring one, making it safe to use even if the person has fainted for another reason [1].
Additional considerations
Although AEDs are designed for use by untrained individuals, training in CPR and how to use the device can increase confidence and effectiveness during emergencies [2]. Individuals at high risk for sudden cardiac arrest may wish to consider having an AED at home; they should consult a cardiologist to help make this decision [1].
Medical references
Cite this answer
ClinicsJo Editorial Team. Are automated external defibrillators (AEDs) safe for use by untrained individuals in cases of sudden cardiac arrest? (Sep 13, 2026).
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