Are Defibrillators Dangerous? Common Myths vs Medical Facts

If you’ve ever wondered, “Are defibrillators dangerous?” you’re not alone. The idea of delivering an electric shock to someone in cardiac arrest can feel intimidating, especially if you’ve never used an Automated External Defibrillator (AED) before.

The reality is that modern defibrillators are designed with safety in mind. AEDs analyse a person’s heart rhythm and will only advise or deliver a shock when it is needed, helping the heart return to a normal rhythm.

The idea of using a defibrillator can be scary, but when they are used quickly and appropriately, they have serious benefits to the patient. 

According to a study by the American National Library of Medicine, when a bystander administered a shock to someone who needed it right away, their survival rate increased from 43% to 66.5%, compared to waiting for a first responder.  

Additionally, the health outcomes were much better. When a bystander administered a shock right away, 57.1% of patients were more likely to live and leave the hospital with good brain function. Compared to 32.7% if first responders administered the shock.

Despite these benefits, many people still hesitate to use a defibrillator because of common misconceptions about safety, pain, and the risk of causing harm.

So, are defibrillators dangerous? In most cases, no. To help you feel more confident using an AED, let’s separate the myths from the facts.

Will A Defibrillator Shock A Beating Heart?

In most cases, no.

Modern AEDs analyse a person’s heart rhythm before advising or delivering a shock. If the device does not detect a shockable rhythm, it will not allow a shock to be administered.

This is one of the key safety features built into modern defibrillators and helps prevent unnecessary shocks. AEDs are designed to guide rescuers through the process and only recommend treatment when it is needed.

Contrary to common belief, defibrillators are not used to start the heart. They are used to re-establish the heart’s normal rhythm when it is beating irregularly. 

A defibrillator should be used when the heart has a chaotic or dangerous rhythm and is not pumping blood effectively.

When the heart is in this state, oxygen does not reach the brain and body effectively. Ideally, when an Automated External Defibrillator (AED) is being prepared, someone should be performing CPR. 

Modern defibrillators are designed to guide rescuers through the process, analysing the patient’s heart rhythm and advising whether a shock is required.

If an AED device does not detect a shockable rhythm, it will not allow a shock to be administered.

Are Defibrillators Painful?

This is a common concern and an understandable one. No one wants to inflict pain on someone else, especially those in distress. The natural question then becomes, are defibrillators dangerous?

If the patient is awake, the shock has been described as being like a ‘kick to the chest’’. But if the patient is unconscious, they don’t feel or remember anything. 

It is an unpleasant thought, but it cannot be overstated that every second counts, and AED machines are created not to administer a shock to someone who doesn’t need it. So please do not hesitate! 

Is it Dangerous to Change the Battery on a Defibrillator?

No, changing the battery on a defibrillator is not dangerous when carried out according to the manufacturer’s instructions.

AED batteries are designed to be replaced safely and easily, with no risk of electric shock during the replacement process. The battery powers the device, but it does not store the high-voltage charge used during a defibrillation shock.

Most modern AEDs are designed so batteries can be replaced by the owner without specialist tools or technical training. They also perform regular self-tests and provide clear status indicators when a battery is approaching the end of its service life.

After replacing the battery, it is important to check the device’s status indicator and follow any recommended maintenance checks to ensure the unit remains rescue-ready.

If you are unsure about replacing a battery or notice signs of damage to the device, consult the manufacturer’s guidance or contact your supplier for assistance.

AED batteries are designed to be replaced safely and easily, with no risk of electric shock during the replacement process.

Can A Defibrillator Burn You?

Burns are a rare occurrence when using a defibrillator. 

Modern defibrillators have gelled pads designed to avoid ‘hot spots’ and minimise heat concentration. For defibrillators, burns could fall into two categories:

• First-degree burns: some pain and redness, but no blistering, can happen, but are relatively uncommon. 
• Second-degree burns: Blistering and more pain are also uncommon. 

The likelihood of burns is low overall, especially when compared to the potential risks of not defibrillating someone in cardiac arrest.  

Is It Safe To Reuse A Defibrillator?

The AED unit is reusable, but the pads and batteries need to be replaced periodically. The modern units often have a 7 to 10-year lifespan. Most manufacturers recommend the following checks:

• Weekly – Check the unit’s status indicator, check for external damage. 
• Monthly – Power on briefly to check voice prompts and for any errors. 

Typically, pads last anywhere from 2 to 5 years; make a note of their expiration date on purchase. Batteries often last between 4 to 6 years, and the device will often alert you when it is coming up to the replacement date, but you should make a note on purchase for your own records. 

Of course, if the unit is showing signs of damage or regularly showing faults, that is a clear indication that you need to repair or replace your defibrillator.  

If you are searching for a defibrillator with a long life span, the iPAD NFK200 has a 7-year manufacturer’s warranty, and the Mindray BeneHeart C2 has an 8-year warranty, giving you peace of mind for the future. 

AED units are reusable, but defibrillator pads and batteries will need to be replaced periodically.

How Can We Help

By now, we hope we’ve shown that defibrillators are far safer and easier to use than many people realise. In a cardiac emergency, having a working AED nearby can significantly improve a person’s chances of survival.

Given the difference fast action can make to someone’s medical outcomes, it is important to have an AED in high-traffic areas, ensuring it is up to date and in full working condition.

If you are looking for a defibrillator for your space, our team can help you. 

Get in touch with us on 0333 253 0770 or email sales@defibworld.org.