Defibrillating Someone with an Internal Defibrillator: What You Need to Know
Learn how to safely use an AED on someone with an internal defibrillator and increase their chances of survival in emergencies
When a cardiac arrest occurs, every second counts. Automated External Defibrillators (AEDs) play a critical role in saving lives by delivering a controlled shock to restore normal heart rhythm. But what happens if the person in need already has an internal defibrillator, such as an Implantable Cardioverter Defibrillator (ICD) or a pacemaker? Many bystanders worry about whether they should use an AED in these situations. In this guide, we clarify the essential steps to take when defibrillating someone with an internal defibrillator.
What is an Internal Defibrillator?
An internal defibrillator, also known as an ICD, is a small device implanted under the skin, typically near the collarbone. It continuously monitors heart rhythms and delivers an electric shock when a life-threatening arrhythmia is detected. While ICDs are life-saving devices, they may not always function correctly or deliver a shock when needed, which is why using an external AED can still be necessary in an emergency.
Can You Use a Defibrillator on Someone with an Internal Defibrillator?
Yes, you can and should use an AED on someone with an ICD or pacemaker if they are unresponsive and not breathing normally. The presence of an internal defibrillator does not mean the casualty will not need external defibrillation. If the ICD has failed or has not been triggered, using an AED is the best course of action.
How to Use an AED on a Person with an Internal Defibrillator
- Check for Responsiveness – If the person is unresponsive and not breathing normally, call 999 immediately and begin CPR.
- Prepare the Chest Area – Remove any clothing from the chest to ensure the AED pads make direct contact with the skin.
- Look for an Internal Device – An ICD or pacemaker may appear as a small lump under the skin, usually near the collarbone.
- Adjust Pad Placement – Avoid placing the AED pad directly over the device. Instead, position the pads slightly lower or to the side to ensure the electric shock can pass effectively through the heart.
- Follow AED Instructions – The AED will analyse the heart’s rhythm and guide you through the process. If a shock is advised, deliver it without hesitation.
- Continue CPR – If the person does not regain consciousness, continue CPR until emergency medical professionals arrive.
Common Concerns About Using an AED on Someone with an ICD
Can an AED damage an internal defibrillator?
No, AED shocks are external and will not harm an implanted ICD or pacemaker. The priority is to restart the heart, and an AED will only deliver a shock if necessary.
What if the internal defibrillator delivers a shock at the same time as the AED?
This is unlikely, as ICDs operate on a separate detection mechanism. If the person has collapsed and their ICD has not restored a normal rhythm, using an AED is still the best option.
Why It’s Important to Act Quickly
A cardiac arrest victim’s survival rate drops by 10% for every minute without defibrillation. Whether or not someone has an internal defibrillator, the key is to act fast. If an AED is available, use it without delay. Modern AEDs are designed to assess the heart’s condition and only deliver a shock if it is required.
Where to Find AEDs for Public and Workplace Use
Defibrillators should be easily accessible in workplaces, community spaces, and public areas. At Defib Supplies, we offer a wide range of AEDs suitable for all environments. Browse our selection of life-saving defibrillators to ensure your organisation is prepared for any emergency.
If someone collapses and is unresponsive, always follow emergency procedures. Whether they have an internal defibrillator or not, using an AED alongside CPR gives them the best chance of survival. Quick action saves lives—never hesitate to use a defibrillator in an emergency.
