3.3 Pediatric AED Use & Dose Attenuators

3.3 Pediatric AED Use & Dose Attenuators

The 2025 AHA/American Academy of Pediatrics Pediatric Basic Life Support Guidelines emphasize attaching and using an automated external defibrillator (AED) as soon as possible for infants and children in cardiac arrest. Respiratory causes are common in pediatric arrest, so compressions and breaths remain essential, but that does not justify waiting to apply an available AED.

Choose the available device promptly

Use an AED with pediatric pads and a pediatric dose attenuator when that equipment is available and approved for the child's size or age under the device instructions. An attenuator reduces the energy delivered by that particular AED. The exact output is device-specific; there is no single universal 50- or 75-joule value that learners should assign to every pediatric AED.

If a pediatric attenuator or pediatric pads are not available, use a standard AED. The correct fallback is not to withhold defibrillation while waiting for special equipment. Turn on the device, follow its prompts, and continue high-quality CPR except when the AED requires everyone to clear for analysis or shock.

Pad selection and placement

Expose and dry the chest enough for the pads to adhere. Apply the pads shown in the AED's diagram. On a child with enough chest area, anterolateral placement may be possible: one pad on the upper right chest and the other on the lower left side of the chest. On an infant or small child, the pads may be too large to fit without touching. In that case, use anteroposterior placement—one pad on the chest and the other on the back—following the pad diagram.

The core placement rules are:

• Pads must adhere to bare skin.
• Pads must not touch or overlap.
• Do not cut, trim, or fold pads to make them fit.
• Keep compressions going while another rescuer prepares and applies the pads when possible.
• Clear the patient completely during AED analysis and shock delivery.
• Resume CPR immediately after a shock or a no-shock message.

If the AED has a child key, selector, cable, or special pads, use the exact configuration described by the manufacturer. Different AEDs implement pediatric mode differently, so memorizing a generic connector or energy value can create an unsafe mismatch in practice.

Age categories and device labels

Pediatric BLS covers infants younger than 1 year, excluding newly born infants in the delivery setting, and children from 1 year to signs of puberty. AED product labels may use age or weight limits for their pediatric accessories. Because those limits vary, the BLS principle is to use pediatric attenuation when available and indicated, while following the device instructions. A study guide should not replace those instructions with a universal weight cutoff.

Two-rescuer workflow

When two rescuers are present, one continues CPR while the other turns on the AED and prepares the pads. Pause only when the device says to clear. The AED operator should look from head to toe and confirm that no one is touching the patient before analysis and again before a shock. After the shock, or after a no-shock message, the compressor resumes immediately. Do not stop to perform an unscheduled pulse check just because a shock was delivered.

For a lone rescuer, the exact activation sequence depends on whether a pediatric collapse was witnessed and whether a phone is available. Once an AED is at the patient's side, however, apply it promptly while limiting interruptions.

Common errors

• Waiting for a manual defibrillator: An available AED should be used; do not leave a child without defibrillation while searching for a preferred device.
• Quoting a fixed attenuated energy: Pediatric AED output depends on the device.
• Letting pads touch: Move to front-and-back placement if needed.
• Cutting pads: This can damage the electrode and is never a safe sizing method.
• Using pediatric accessories on a patient for whom they are not indicated: Follow device labeling and use adult mode when appropriate.

The skills-test priority is simple: continue CPR, turn on the AED, attach the correct available pads without overlap, clear for analysis and shock, then resume CPR immediately.