AED Defibrillator Electrode Pads: How to Choose, Check and Replace the Right Pads
AEDs are designed to be simple in an emergency, but the equipment behind that simplicity still needs proper checking. One of the easiest things to miss is also one of the most important: the electrode pads.
For clinics, sports facilities, workplaces and community sites, AED Defibrillator Electrode Pads should never be treated as a one-time purchase. Pads expire, adhesives dry out, packaging can become damaged, and compatibility matters. A defibrillator may pass a visual check at first glance, but if the pads are out of date or the wrong type, the device may not perform as expected when it is needed most.
That is why keeping the right pads for defibrillator use is a practical part of AED readiness, not an admin detail.
Why AED pads deserve more attention
Most people check the AED unit first. Is the status light green? Is the battery showing as ready? Is the cabinet accessible?
All good checks. But the pads are the part that physically connects the device to the patient. They need to stick properly, read rhythm accurately and deliver treatment effectively.
For busy clinical and public-facing environments, a simple pad check can prevent bigger problems later. This matters especially in places where the AED may sit unused for months or years, then suddenly become critical in a high-pressure situation.
A useful rule for practice managers: treat defibrillator pads like other time-sensitive clinical consumables. They should have a recorded expiry date, a named person responsible for checking them, and a replacement process before they expire.
Adult pads, child pads and paediatric settings
Adult AED pads are generally intended for adult patients and larger children. Paediatric pads are designed for smaller children and usually reduce the delivered shock energy to a more suitable level.
Some AEDs use separate paediatric pads. Others use adult pads with a paediatric mode or key. This is where model-specific knowledge matters. It is not safe to assume that one brand’s pads will work with another device, or that adult pads can always be adapted for paediatric use in the same way.
For schools, leisure centres, sports clubs, dental practices and family-facing clinics, paediatric readiness is worth checking properly. You may not need separate paediatric pads for every AED model, but you do need to know exactly how your device handles child rescue settings.
A good AED check should answer three questions:
- Are adult pads present and in date?
- Does the site need paediatric pads or a paediatric setting?
- Does the team know where those pads or keys are stored?
The last point is often overlooked. In an emergency, accessories should not be hidden in a drawer, locked away from the AED, or kept separately without clear signage.
Correct defibrillator pad placement for adult patients
Correct defibrillator pad placement for adult patients is straightforward, but it is worth reinforcing during staff refreshers.
For standard adult placement, one pad goes on the upper right chest, below the collarbone. The second pad goes on the lower left side of the chest, below and slightly to the left of the armpit.
Most AED pads include a clear placement diagram on the packaging or the pads themselves. The AED will also talk the responder through the process. This helps non-clinical users, but trained staff should still be familiar with the placement before an incident occurs.
For practitioners, the useful teaching point is this: the pads need to create a pathway across the heart. Poor placement can reduce the effectiveness of rhythm analysis and shock delivery.
Common issues to watch for include pads placed too close together, pads placed over clothing, poor skin contact, or placement disrupted because the patient is wet, very sweaty or has a lot of chest hair. AED rescue kits often include shears, a razor and a towel for exactly these situations.
Expiry dates are not a suggestion
AED pads have gel that helps the pad stick to the skin and conduct properly. Over time, that gel can dry out. Once pads are past their expiry date, they may not adhere well or perform reliably.
Most AED electrode pads last between two and five years, depending on brand and model. The expiry date is printed on the sealed packet, and it should be checked as part of routine AED maintenance.
For clinics and workplaces, it helps to keep a visible AED log with:
- AED model
- Pad type
- Pad expiry date
- Battery expiry or installation date
- Last visual check
- Name of the person checking it
This is a small habit, but it makes compliance much easier. It also stops replacement pads from becoming a panic purchase after the expiry date has already passed.
Do not open pads “to check them”
This catches people out. AED pads should stay sealed until use.
Opening the packet exposes the adhesive gel and can shorten the life of the pads. Even if the pads look fine, once the sealed packaging has been opened, they should usually be treated as used or compromised.
If you are training staff, use AED training electrodes, not live pads. Training pads are designed for repeated practice and do not connect to a live rescue shock in the same way.
Brand compatibility matters
AED pads are usually model-specific. A set of pads may look similar, but the connector, energy settings, pad recognition and device prompts can differ between manufacturers.
That means pads for defibrillator units should always be selected according to the AED make and model. Ordering the wrong set can leave a site with accessories that cannot connect to the device.
Before ordering replacement defibrillator pads, check:
- AED brand
- AED model name or number
- Adult or paediatric requirement
- Connector type
- Pad expiry period
- Any device-specific cartridge or cassette format
This is especially important for organisations with multiple AEDs across different sites. The pads in one cabinet may not suit the AED in another building.
trimbio stocks pads for major AED brands and can help identify the right option if the model is unclear.
When should AED pads be replaced?
Replace AED pads when:
- They have expired
- The sealed packet has been opened
- They have been used during a rescue
- The packaging is damaged
- The AED indicates a pad fault
- The pads have been exposed to poor storage conditions
- The device model has changed
After any AED use, pads should be replaced straight away. The battery may also need checking, depending on the device and incident.
Storage makes a difference
AEDs are often stored in reception areas, sports halls, corridors, poolside areas, treatment rooms and outdoor cabinets. These environments vary a lot in temperature, humidity and general wear.
Pads should be stored with the AED, but protected inside their sealed packaging. Avoid leaving spare pads loose, folded, crushed or exposed to heat.
Outdoor AED cabinets should be checked especially carefully. Even when cabinets are designed for external use, accessories still need routine inspection. Cold, heat and moisture can all affect readiness over time.
If an AED is used in a sports club or event setting, it is worth checking the pads before and after high-use periods, such as pre-season training, tournaments or large public events.
A simple AED pad check for clinics and workplaces
A monthly check is usually enough for many sites, unless local policy requires more frequent checks. The process does not need to be complicated.
Check that the AED is present, visible and accessible. Confirm the status indicator is showing ready. Open the case or cabinet and check the pads are sealed, in date and correct for the device. Record the expiry date. Make sure spare pads, paediatric pads or rescue kit items are where the responder expects them to be.
The aim is not to create extra paperwork. It is to make sure that in a real emergency, the AED is ready, the pads fit the device, and no one loses time searching for basic accessories.
Ordering AED Defibrillator Electrode Pads from trimbio
trimbio supplies AED Defibrillator Electrode Pads for major device brands, along with AED batteries, training pads, cabinets, brackets, signs and accessories.
As a UK-based, family-run supplier with 50+ years of experience, trimbio supports clinics, NHS teams, sports therapists, workplaces and public-access defibrillator sites with practical advice and reliable equipment supply. The brand tone guide also positions trimbio around clear, plain-spoken clinical support, honest product advice and long-term aftercare.
If you are not sure which pads your AED needs, check the model details on the device or contact the trimbio team before ordering.