AED Usage
AED Usage Q&A
What is sudden cardiac arrest (SCA), and how is it different from a heart attack?
Sudden cardiac arrest is a condition where the heart unexpectedly stops beating, cutting off blood flow to the brain and body. It differs from a heart attack, which is caused by blocked blood flow to the heart muscle.
What is the recommended treatment for SCA?
The most effective treatment is immediate CPR combined with defibrillation using an AED (Automated External Defibrillator).
How much time do I have to respond if someone has a sudden cardiac arrest?
You have only a few minutes. Brain damage can begin within 4–6 minutes, and survival rates drop by 10% with each passing minute without defibrillation.
Why do we need AEDs?
AEDs are the only effective way to restore a normal heart rhythm in many SCA cases. They greatly improve the chance of survival when used promptly.
How does an AED work?
An AED analyses the patient’s heart rhythm through two electrode pads placed on the chest. If a life-threatening, shockable rhythm is detected, the AED automatically determines the need for a shock. It then delivers an electric shock to help restore a normal heart rhythm. Throughout the process, the AED provides clear voice prompts to guide the user step-by-step, making it usable even for non-medical responders.
What heart rhythms can an AED detect?
Two types: “shockable rhythms” and “non-shockable rhythms.”
Will an AED shock someone who doesn’t have SCA?
No. AEDs will only deliver a shock if a shockable rhythm is detected. They are designed to avoid harming healthy individuals.
Can CPR alone save someone from SCA without an AED?
The chances are very low. AEDs are essential for restoring heart rhythm and offer the highest chance of survival.
Can I remove the AED pads if the patient regains consciousness?
No. Even if the patient regains consciousness, it’s important to keep the electrode pads in place. A sudden cardiac arrest indicates an underlying heart condition, and there is a risk that the patient may experience another episode. The AED continues to monitor the patient’s heart rhythm, so the pads should remain attached until medical professionals arrive and take over.
Do I need special pads to use an AED on a child?
No, VIVEST AEDs are designed with universal electrode pads that work for both adults and children. There’s no need to change pads—simply press the child mode button to adjust the defibrillation energy for pediatric use.
Can AED pads be reused?
No. AED pads are single-use only. The gel loses effectiveness after use.
Are AEDs waterproof and suitable for harsh environments?
Yes. VIVEST A1 & A3 AEDs are rated IP55, and P1 & P3 series AEDs are rated IP65, making them highly resistant to dust and water.
How quickly can an AED analyse the heart rhythm after pads are attached?
VIVEST AEDs analyse the heart rhythm within 7 seconds of proper pad placement.
What happens if the AED is out of power, faulty, or the pads are expired?
VIVEST AEDs perform automatic self-tests at regular intervals. If the device detects issues such as low battery, expired pads, or internal faults, it will alert users through visual indicators (e.g., red flashing status light) and audible beeps. In such cases, follow the maintenance instructions in the user manual—typically involving pad or battery replacement. For internal faults, please contact authorized service personnel or the manufacturer for assistance.
What if I forget to switch to child mode?
VIVEST AEDs automatically adjust shock current based on body impedance. However, child mode is still recommended for better safety.
What data is recorded and exported after using an AED?
VIVEST AEDs automatically record and store essential data during a rescue event. This includes the patient’s heart rhythm before and after defibrillation, the number and timing of shocks delivered, CPR performance data (if applicable), and a complete log of the device’s operations and voice prompts. After the event, this information can be easily exported via USB and is intended for use by medical professionals to support clinical review, documentation, and quality control.
How many shocks can an AED deliver? Is the battery sufficient?
VIVEST A1 & A3 can deliver at least 200 shocks at 150J; P1 & P3 can deliver up to 250 shocks—more than enough for emergency use.
Must the patient’s chest be bare to use the AED?
Yes. Pads must be placed on bare skin for proper contact and functionality, including for female patients.
Can I use an AED if the patient’s chest is wet?
Dry the chest before attaching pads to avoid conductivity risks.
What should I do if the patient is wearing metal jewellery or accessories?
Remove them to prevent burns during shock delivery. This includes underwired bras.
What happens if someone is touching the patient during a shock?
They may receive a harmful shock. Always make sure no one is touching the patient during analysis and defibrillation.
Can I use an AED on someone with a pacemaker?
Yes. If the person goes into cardiac arrest, use the AED. The device will determine if a shock is necessary.
What if there’s a medication patch or ointment on the pad area?
Remove it before attaching the AED pads to ensure good contact.
Can an AED be used on a pregnant woman? Will it harm the baby?
Yes. Saving the mother is the top priority, and there’s no evidence that AED shocks harm the fetus.
Can people with conditions like stroke or myocarditis be treated with an AED?
Yes. AEDs respond only to shockable rhythms. The cause of arrest is less important during emergency care.
Are there any long-term side effects from AED shocks?
AEDs are designed to save lives in critical situations like sudden cardiac arrest. VIVEST AEDs use advanced low-energy defibrillation technology, which minimises the risk of additional harm and supports patient recovery. The potential benefits of timely defibrillation far outweigh any minimal risk of side effects.
Where are AEDs usually installed?
AEDs are typically installed in high-traffic or high-risk areas where rapid response is crucial—such as office buildings, shopping centres, gyms, manufacturing facilities, and public venues. Placement should follow the “golden 4-minute” principle. VIVEST can provide tailored recommendations based on your specific environment.
How long does an AED battery last?
VIVEST A1 & A3 batteries last up to 5 years on standby; P1 & P3 batteries last 3 years. Self-check alerts notify when to replace.
How often should AED pads be replaced?
Refer to the expiration date on the pad label. The device will alert you before they expire.
What is the AED's lifespan? Is there a warranty?
All VIVEST AEDs have a 10-year lifespan and at least a 5-year warranty, with full lifecycle support.
Is the AED heavy? Is it easy to carry?
The A1 & A3 Series weighs only 1.5 kg, and the P1 & P3 series just 700g—lightweight and ideal for rapid response.
How many languages does the AED support?
VIVEST AEDs currently support voice prompts in 32 languages. For the A3 defibrillator, during rescue (mission) mode, up to three languages can be preloaded and switched between. Language settings can be configured using the device management software.
If I purchase an AED, do you offer on-site installation and training?
VIVEST AEDs require minimal setup. Upon receiving the device, simply follow the steps in the “Installation” section of the user manual—install the battery and electrode pads as instructed. Once completed, the AED will automatically run a battery self-test. You may also turn the device on manually to verify a successful self-test. After passing the self-test, the AED is ready for placement in your designated location.
If you require further assistance or on-site installation and training, please contact your local distributor for support.
Can I be sued if I help someone suffering from SCA?
In many countries, Good Samaritan laws protect those who assist in medical emergencies, including AED use, from any liability.
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