AED Pad Placement: Complete Guide for All Ages

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AED pad placement sounds like a small detail until you are the person holding the pads while someone is down. In that moment, people start second-guessing themselves fast. One pad goes where? What if the person is a child? What if the pads look too big? What if you get it wrong?

AEDs are designed to guide you, and the pad diagrams do most of the work. Still, knowing the basic placement before the emergency means less time staring at the chest and more time moving through the response with some confidence.

Pad placement affects how well the AED can analyze the rhythm and deliver a shock if one is advised. When the pads are placed correctly and the rest of the CPR-AED sequence keeps moving, the response gets a lot smoother and there is less wasted time at exactly the point where hesitation hurts most.

If you want that sequence to feel familiar before you need it, the AHA BLS CPR class gives students hands-on practice with AED use instead of leaving it as a guess-in-the-moment skill.

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AED Pad Placement for Adults

For an adult, the usual pad placement is simple. One pad goes on the upper right side of the bare chest, just below the collarbone. The other goes on the lower left side of the chest, a little below the armpit.

That setup lets the electrical current pass through the heart the way the AED expects. You do not need to invent a custom layout or remember medical language under stress. Follow the diagram on the pads and place them firmly on dry bare skin.

Expose the chest before applying the pads. Clothing gets in the way, and wet skin should be dried quickly first. If the person has a lot of chest hair and the pad will not stick well, that can affect placement too. These are adjustments, not reasons to stop the response.

For adults, keep it simple: upper right chest, lower left chest. Press the pads down well, let the AED analyze, and keep following the prompts.

AED Pad Placement for Children (Ages 1–8)

For children ages 1 to 8, AED pad placement depends on the size of the child and the type of pads available. If the AED has child pads or a child mode, use those and follow the device instructions.

In many cases, the placement still follows the pad diagrams provided with the AED. If both pads fit on the chest without touching, place them as directed on the front of the chest. If the child’s chest is too small for that setup and the pads would touch, the setup may need to shift to front-and-back positioning if the AED instructions call for it.

A smaller chest can make the whole setup look less familiar at first. Slow down for a second, check the diagrams, and make sure the pads do not overlap. The right answer is not to force the usual adult layout onto a body that clearly cannot fit it.

Familiarity is what helps most. If you have practiced the CPR-AED sequence before, you are much more likely to trust the diagrams and keep moving instead of freezing on pad size.

AED Pad Placement for Infants (Under 1 Year)

Infant AED pad placement is the part that makes a lot of people nervous, mostly because the body is so small. The same basic rule still applies: follow the AED instructions and use infant- or child-appropriate equipment if it is available.

When the infant is too small for both pads to sit safely on the chest without touching, a front-and-back setup is often used. One pad goes on the center of the chest and the other goes on the back. That helps avoid overlap and still allows the AED to work as intended.

This is not something people should try to improvise from memory if the pad diagrams are right in front of them. The diagrams and device prompts are there to help. Your job is to place the pads where the AED shows, make sure they are not touching, and continue with the response.

Infant emergencies feel more intimidating on paper than after you have worked through the steps in class.

What If Pads Touch or Overlap?

If AED pads touch or overlap, that needs to be fixed before the AED analyzes or delivers a shock. The pads need enough separation to work correctly.

This comes up most often with children and infants because the body is smaller. When the chest is too small for the usual front placement, the answer is not to force the pads in anyway. The answer is to use the placement the AED instructions show for a smaller body, which may mean front-and-back positioning.

Panicking over perfect placement wastes time at exactly the wrong moment. The job is to get the pads into the correct non-touching positions shown by the device and keep the response moving.

If you want the full sequence around pad placement, shock prompts, and when to clear the patient, the step-by-step AED guide covers how the steps fit together once the pads are on.

Special Situations

Medication patches. Remove the patch and wipe the skin before placing the pad. The medication patch can interfere with good pad contact and can cause burns.

Pacemakers and implanted defibrillators. You can still use the AED. If you see or feel the device under the skin, place the pad slightly to the side instead of directly over it.

Thick chest hair. Chest hair usually is not a problem, but if it prevents the pad from sticking, quickly shave the pad site if a razor is available.

Wet skin or wet ground. Move the person out of standing water, wipe the chest dry, and keep the AED itself as dry as possible. Do not delay defibrillation longer than necessary.

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Pregnancy. It is safe to use an AED on a pregnant person. Use the adult pads and do not hesitate.

Jewelry and piercings. You do not need to remove them, but do not place the pad directly over metal jewelry or a piercing. Adjust placement slightly if needed.

FAQ

For an adult, one pad goes on the upper right side of the bare chest, just below the collarbone. The other goes on the lower left side of the chest, slightly below the armpit. That layout lets the current travel through the heart in the direction the AED is designed to use. The pads themselves have diagrams printed on them; those diagrams are authoritative in the moment, so look at them first rather than trying to recall instructions from memory.

No. The pads need direct contact with bare skin to stick properly and allow the AED to read the rhythm and deliver a shock. If the person is clothed, expose the chest before placing the pads: cut or pull clothing out of the way. Speed matters, but the pads have to be on skin, not fabric, for the AED to work.

Dry it quickly before placing the pads. Water can prevent the pads from sticking properly and interfere with how well the AED reads the rhythm. A quick wipe with a towel or clothing is usually enough. If the person is in standing water, move them to a dry surface first. Do not delay defibrillation longer than necessary. The goal is good pad contact, not a perfect surface.

No. If the pads touch or overlap, reposition them before the AED analyzes the rhythm. Overlapping pads can short-circuit the delivery and prevent the AED from working as intended. This comes up most often with children and infants because the chest is smaller. When there is not enough room for the standard front placement without the pads meeting, follow the AED instructions for an alternative setup, usually front-and-back positioning.

It can be, depending on the child’s size and what equipment the AED has. If child pads or a child mode are available, use them and follow the device instructions. The placement may still follow the standard anterior layout if the pads fit without touching. If the child is small enough that the pads would overlap on the front of the chest, the AED instructions may call for a front-and-back setup instead. Check the diagrams and let the device guide the decision.

Often yes, because the body is so small. When the front placement would make the pads touch, a front-and-back setup is commonly used: one pad on the center of the chest, the other on the center of the back. This avoids overlap and still allows the AED to work as intended. Use infant- or child-specific pads if they are available with the device, and follow whatever placement the AED instructions show for that body size.

Look at the diagrams printed on the pads themselves; they show exactly where each pad goes with a clear illustration. The AED will also give audio instructions once it is on. The device is designed specifically to guide someone who is not a trained clinician through placement, so turning it on and following the prompts is the answer. Prior familiarity with the sequence helps because it reduces freeze time, but the diagrams and voice prompts are there for exactly that situation.

No medical credential is required. Public AEDs are built for use by ordinary bystanders, and the pad placement diagrams and voice prompts walk you through it. That said, hands-on training makes a meaningful difference, not because it teaches something the device cannot explain, but because going through the sequence once with a manikin and actual pads means your hands know what they are doing when it matters. The AHA BLS class covers AED use as part of the full CPR-AED response.

Step back and let the AED analyze the rhythm. When told to clear, ensure no one is touching the patient and deliver the shock if prompted. Then follow the next instructions, typically to resume CPR immediately. The device will keep directing the response in cycles until EMS arrives. Pad placement is one step in a continuous sequence, not the end of it. If you want the CPR and AED sequence to feel less stressful before you ever need it, AHA BLS training gives you hands-on practice with pad placement, AED prompts, and the rest of the response while an instructor is there to guide you.

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