What is an AED and where can you find it?

What Is an AED? Understanding Automated External Defibrillators

An Automated External Defibrillator (AED) is a portable, life-saving medical device designed to treat sudden cardiac arrest (SCA) by delivering an electrical shock to the heart. When someone experiences SCA, their heart stops beating effectively and begins to quiver in an abnormal rhythm called ventricular fibrillation. An AED analyzes the heart’s rhythm and, if necessary, delivers a controlled electrical shock to restore a normal heartbeat. Understanding how AEDs work alongside CPR can mean the difference between life and death in a cardiac emergency.

Unlike what many people assume, you do not need to be a medical professional to use an AED. These devices are specifically designed for use by ordinary bystanders with minimal or no training. The machine provides clear voice prompts and visual instructions that guide the user through every step of the process. This accessibility is precisely why AEDs have become increasingly common in public spaces across Canada and around the world.

How Does an AED Work?

The technology behind an AED is remarkably sophisticated yet incredibly simple to operate. When you power on an AED and attach the electrode pads to the patient’s bare chest, the device immediately begins analyzing the heart’s electrical activity. The AED’s internal computer evaluates the heart rhythm and determines whether a shock is needed. If the rhythm is shockable — typically ventricular fibrillation or pulseless ventricular tachycardia — the device charges and instructs the user to press the shock button. Some fully automatic models deliver the shock without requiring the user to press anything.

It is important to understand that an AED will not deliver a shock if one is not needed. The device is programmed to recognize specific dangerous rhythms, so there is virtually no risk of accidentally shocking someone who does not require it. This built-in safety feature makes AEDs one of the most user-friendly emergency medical devices available to the general public. When combined with proper first aid and CPR training, knowing how to use an AED dramatically increases survival chances.

Why Are AEDs So Important?

Sudden cardiac arrest is one of the leading causes of death in Canada, claiming approximately 35,000 to 45,000 lives each year. When SCA occurs, every minute without defibrillation reduces the chance of survival by roughly 7 to 10 percent. Emergency medical services (EMS) typically take 8 to 12 minutes to arrive, meaning that without immediate intervention, a cardiac arrest victim’s survival odds drop dramatically before professional help reaches them.

This is where AEDs become critically important. When a bystander uses an AED within the first few minutes of cardiac arrest, survival rates can increase to 70 percent or higher. Compare that to the less than 10 percent survival rate when defibrillation is delayed until paramedics arrive, and the case for widespread AED availability becomes undeniable. Having AEDs accessible in public locations and training people to use them creates a chain of survival that bridges the gap between cardiac arrest and professional medical care.

Defibrillation and the Emergency Room Transition

The use of an AED in the field provides a critical “head start” for the medical team at the emergency room. When an AED is applied, it records the heart’s rhythm data, which can later be downloaded by physicians in the emergency room to determine the exact cause of the cardiac event. This data allows cardiologists to decide immediately if a patient needs an emergency stent, a pacemaker, or specific medication. Furthermore, if a shock was delivered successfully before paramedics arrived, the patient’s chances of reaching the emergency room with intact neurological function increase by over 60%. Understanding that the AED is the first link in a chain that ends in the emergency room highlights why every second counts during a rescue.

Essential Benefits of AED Integration in Public Spaces

The integration of an Automated External Defibrillator (AED) into public infrastructure is the single most effective strategy for increasing cardiac arrest survival rates outside of a hospital. While performing high-quality CPR is vital, only an Automated External Defibrillator (AED) can stop the chaotic electrical activity of ventricular fibrillation and allow the heart’s natural pacemaker to restart. In 2026, smart-city initiatives in Canada have begun linking public Automated External Defibrillator (AED) units to emergency dispatch apps, allowing bystanders to be alerted to the nearest device in real-time. By placing these user-friendly devices in high-traffic zones, communities create a resilient safety net that empowers non-medical bystanders to act as life-saving first responders.

Where Can You Find AEDs in Canada?

AEDs are becoming increasingly common in public spaces throughout Canada. Federal and provincial regulations, along with growing public awareness, have driven the installation of these devices in many high-traffic locations. Here are the most common places where you can find AEDs:

Airports and Transportation Hubs

Major Canadian airports including Toronto Pearson, Vancouver International, and Montreal-Trudeau have AEDs placed throughout their terminals. Train stations, bus terminals, and ferry terminals also commonly have AED units available. These high-traffic areas see millions of people annually, making AED placement essential for responding to cardiac emergencies quickly.

Shopping Malls and Retail Centres

Large shopping centres across Canada are increasingly required to have AEDs on site. You will typically find them near customer service desks, food courts, or security offices. Next time you visit your local mall, take a moment to note where the AED cabinets are located — that awareness could save a life someday.

Schools, Colleges, and Universities

Educational institutions from elementary schools to universities often have AEDs installed in gymnasiums, main offices, and common areas. Given the number of young athletes participating in physical activities at these facilities, having AEDs readily available is particularly important for protecting students, staff, and visitors.

Fitness Centres and Sports Facilities

Gyms, recreational centres, arenas, and sports complexes are high-risk environments for cardiac events due to the physical exertion involved. Most fitness facilities in Canada now have AEDs available, typically near the front desk or in the main workout area. Community pools and aquatic centres are also equipped with these devices, often as part of their BLS and lifeguard safety protocols.

Workplaces and Office Buildings

Many Canadian employers now include AEDs as part of their workplace safety equipment. Office towers, factories, warehouses, and government buildings frequently have AED units installed on each floor or in centralized locations. Corporate first aid and CPR training programs often include AED training to ensure employees can respond effectively in emergencies.

Community Centres and Places of Worship

Libraries, community halls, churches, mosques, temples, and other gathering places increasingly have AEDs available. These locations serve diverse populations including elderly individuals who may be at higher risk for cardiac events, making AED access especially valuable.

How to Recognize an AED

AEDs are typically stored in bright, clearly marked wall-mounted cabinets. Look for a green or white sign featuring a heart with a lightning bolt symbol — this is the universal AED sign. Many AED cabinets are equipped with audible alarms that sound when the cabinet is opened, alerting nearby people that a cardiac emergency may be in progress. The devices themselves are usually compact, often resembling a small laptop case or lunch box, and are designed to be grabbed quickly and carried to the patient.

Watch: How to Use an AED

Step-by-Step Guide to Using an AED

While AEDs are designed to be intuitive, understanding the basic steps beforehand can help you respond more confidently in an emergency. Here is what you should do:

Step 1: Call 911 immediately. Before anything else, ensure that emergency medical services have been contacted. If other bystanders are present, direct someone specific to make the call while you retrieve the AED.

Step 2: Begin CPR. If the person is unresponsive and not breathing normally, start chest compressions immediately. Push hard and fast in the centre of the chest at a rate of 100 to 120 compressions per minute. Continue CPR until the AED is ready to use.

Step 3: Turn on the AED. Power on the device and listen carefully to the voice prompts. The AED will guide you through each step clearly and calmly.

Step 4: Attach the electrode pads. Expose the patient’s chest and place the adhesive pads exactly as shown in the diagrams on the pads. One pad goes on the upper right chest below the collarbone, and the other goes on the lower left side of the chest.

Step 5: Allow the AED to analyze. Make sure nobody is touching the patient while the device analyzes the heart rhythm. The AED will tell you whether a shock is advised.

Step 6: Deliver the shock if advised. If the AED recommends a shock, ensure everyone is clear of the patient and press the shock button when prompted. After the shock, immediately resume CPR as directed by the AED.

AED Training and Certification in Canada

While anyone can use an AED in an emergency, proper training significantly increases your confidence and effectiveness. The CPR and AED certification courses offered through the Canadian Red Cross provide comprehensive hands-on training that covers AED operation, CPR techniques, and how to manage a cardiac emergency from start to finish. These courses are available at training locations across Canada and can be completed in just a few hours.

For those who prefer flexible scheduling, blended online and in-person training options are also available, allowing you to complete the theory portion at your own pace before attending a shorter hands-on skills session. Employers looking to train their entire team can also arrange private group training sessions at their workplace for maximum convenience.

AED Laws and Good Samaritan Protection in Canada

Many Canadians hesitate to use an AED because they worry about legal liability. The good news is that every Canadian province has Good Samaritan legislation that protects bystanders who provide emergency assistance in good faith. If you use an AED to help someone experiencing cardiac arrest, you are legally protected from liability as long as you are acting reasonably and without gross negligence. These laws exist specifically to encourage bystander intervention, because the alternative — doing nothing — almost certainly results in death.

Several provinces have also enacted legislation requiring AEDs in certain public buildings and mandating that staff receive training in their use. Ontario’s Chase McEachern Act (Heart Defibrillator Civil Liability Act), for example, provides specific legal protection for AED users and encourages broader AED placement in public spaces.

Maintaining an AED

If your workplace, school, or community organization owns an AED, regular maintenance is essential to ensure the device is always ready when needed. AED batteries typically last 2 to 5 years, and electrode pads have expiration dates that must be monitored. Most modern AEDs perform automatic self-checks and display a status indicator — usually a green checkmark or flashing light — to confirm the device is operational. Designate someone in your organization to perform monthly visual inspections and keep a maintenance log to track battery and pad replacement schedules.