Guide to using an automated external defibrillator (AED)

The heart functions normally when the atria and ventricles contract, pushing blood out of the heart chambers. However, for various reasons, this contraction may not be strong enough to push blood out of the heart to supply the body and brain, leading to oxygen deprivation and unconsciousness. At this critical moment, an Automated External Defibrillator (AED) can save the victim's life. This guide will explain what an AED is and provide tips for using one effectively.

1. What is the purpose of an AED?

When cardiac arrest occurs, the chance of survival decreases by 10% every minute. An AED can analyze the victim's heart rhythm and deliver a shock if necessary to restore a normal heartbeat. Additionally, some AEDs feature voice and visual prompts on an LCD screen to guide the user in performing cardiopulmonary resuscitation (CPR). Most out-of-hospital cardiac arrest patients need an AED and CPR to improve their chances of survival.

Image 1: Performing CPR on an out-of-hospital cardiac arrest patient*

2. Steps for using an AED

While different AED brands may have specific instructions, they generally follow the same basic principles of operation.

Image 2: Providing first aid with an AED

Step-by-Step Instructions:

Turn on the AED: Power up the device and remove the electrode pads from their packaging.
Prepare the Victim: Remove or cut away clothing to expose the victim's chest. Clean the chest area (wipe away sweat, and if the chest is covered with hair, use a razor to remove the hair).
Apply the Electrodes: Unwrap the electrode pads, and place them on the victim’s chest. Position the first electrode on the upper right side of the chest, just below the collarbone. Place the second electrode on the lower left side of the chest, below the armpit. Ensure that the pads are aligned from the victim’s head to their feet.
Analyze the Heart Rhythm: While the AED analyzes the victim's heart rhythm, make sure no one is touching the victim’s body. Any contact could result in harm to both the victim and the rescuer from the electric shock.