How to Use an AED Step by Step
An automated external defibrillator is designed to guide the user with visual and spoken prompts. The most important rule is to bring it into the CPR sequence quickly without allowing setup to stop compressions longer than necessary.
Call 911 and begin CPR while another person retrieves the AED. Once it arrives, turn it on, expose the chest, prepare the pad areas, attach pads as pictured and follow every instruction. The device decides whether a shock is advised.
Power, pads, clear and resume
Turn on the AED, expose and dry the chest, attach pads to bare skin, connect them if required, clear everyone for rhythm analysis and shock, then return to CPR immediately when prompted.
Do not attach pads over clothing, touch the person during analysis or shock, place pads over medication patches or implanted-device bumps, or stop because the AED says no shock is advised.
AED use decision guide
Use this comparison to connect an observable cue with a safe next step and a clear boundary.
| Priority | What can go wrong | Useful action |
|---|---|---|
| Turn it on | Prompts begin only after activation. | Open or power the unit immediately. |
| Prepare bare skin | Water, hair or patches can interfere with adhesion. | Expose, dry and prepare only as needed. |
| Place pads as shown | Correct spacing creates the intended current path. | Use the diagrams on the actual pads. |
| Clear and resume | Touch can affect analysis and create shock risk. | Visually clear, deliver if prompted and restart CPR. |
| Activate professional help early | A serious or uncertain pattern can worsen while a bystander searches for certainty. | Call 911, use speaker mode and report observable changes while first aid continues. |
Turn it on
Prompts begin only after activation. This principle becomes easier to remember when it is connected to a specific cue.
Open or power the unit immediately. Describe what you can see, hear or verify without guessing at the cause. Then use current training and live instructions to decide what comes next.
Prepare bare skin
Water, hair or patches can interfere with adhesion. The safest boundary is the point at which basic first aid stops and professional assessment begins.
Expose, dry and prepare only as needed. Do not let a familiar-looking symptom create false reassurance. When the pattern is severe, changing or uncertain, early escalation is the practical choice.
Place pads as shown
Correct spacing creates the intended current path. Preparation reduces the number of decisions that must be invented during the emergency.
Use the diagrams on the actual pads. Equipment, roles and communication should support the skill rather than compete with it. Afterward, document any gap that should be corrected before the next event.
Everyone says clear, one hand remains
During practice, a helper keeps a hand on the person while watching the display. The AED operator learns to look from head to feet and obtain a visible clear before analysis.
A spoken warning is not enough; the operator must verify no contact.
Clear and resume
Touch can affect analysis and create shock risk. The distinction matters because a responder works from observable facts, not a private diagnosis.
Visually clear, deliver if prompted and restart CPR. Keep the next step plain enough that another bystander can repeat it back. That protects the urgent priority while professional help is being activated.
Activate professional help early
A serious or uncertain pattern can worsen while a bystander searches for certainty. In a stressful scene, this is where a small decision can either preserve momentum or create a distracting delay.
Call 911, use speaker mode and report observable changes while first aid continues. State the action aloud, assign it to one person and confirm that it happened. A useful response is controlled and visible rather than dramatic.
Prepare a precise handoff
Location, mechanism, responsiveness, breathing and actions already taken help the next responder. This principle becomes easier to remember when it is connected to a specific cue.
Give a short factual report and continue monitoring until care is transferred. Describe what you can see, hear or verify without guessing at the cause. Then use current training and live instructions to decide what comes next.
Frequently asked questions
Can I shock someone by mistake?
The AED analyzes the rhythm and advises a shock only when indicated; still follow prompts and clear everyone.
What does no shock advised mean?
It means the analyzed rhythm is not one the device recommends shocking. Resume CPR and continue following prompts.
What if I am unsure whether breathing is normal?
Call 911, use speaker mode and describe exactly what you see and hear. Gasping is not normal breathing, and the dispatcher can guide the response.
Should I wait for someone more experienced?
No. Activate emergency services and begin the response you are trained or directed to provide. Waiting without acting loses time.
Common shortcuts that create avoidable risk
Fast care is not the same as rushed care. A useful response protects the first life-saving priority while avoiding actions that add injury, delay or confusion. Review these traps during practice so the correction is available before stress narrows attention.
Clear and resume
Teams also lose time when several people start the same task while no one owns the emergency call or handoff. Touch can affect analysis and create shock risk. The safer correction is specific: Visually clear, deliver if prompted and restart CPR. Confirm the action aloud and keep watching for a change that requires 911, CPR or another trained response.
Activate professional help early
The appearance of improvement can create false reassurance when no one keeps monitoring the original warning signs. A serious or uncertain pattern can worsen while a bystander searches for certainty. The safer correction is specific: Call 911, use speaker mode and report observable changes while first aid continues. Confirm the action aloud and keep watching for a change that requires 911, CPR or another trained response.
Prepare a precise handoff
Finally, responders may cross a first-aid boundary because doing more feels more helpful than waiting for professional care. Location, mechanism, responsiveness, breathing and actions already taken help the next responder. The safer correction is specific: Give a short factual report and continue monitoring until care is transferred. Confirm the action aloud and keep watching for a change that requires 911, CPR or another trained response.
Turn the guidance into a five-minute drill
A short tabletop exercise can expose confusion without asking anyone to act out an injury. Use a manikin or training device when physical skill practice is appropriate. Never rehearse an emergency maneuver on an unsuspecting person, and stop any exercise that becomes unsafe.
- Turn it on: Add noise or limited space, then practice giving one clear instruction at a time.
- Prepare bare skin: Identify the exact moment when first aid reaches its limit and professional guidance is needed.
- Place pads as shown: Finish with the location, the person’s condition, actions taken and any meaningful change.
- Clear and resume: Name the observable cue, the first action and the person responsible for calling 911.
- Activate professional help early: Remove one helper from the scenario and decide which priority must still be protected.
Run the scene once with the supplies and people normally available. On the second pass, change one condition: the phone cannot connect immediately, the usual kit is missing, the space is crowded or the person cannot answer questions. The purpose is not to invent advanced treatment. It is to preserve scene safety, emergency activation, the highest-priority first-aid action and a clear handoff.
Debrief with evidence instead of impressions. Ask what was noticed first, how long it took to assign the emergency call, which words caused confusion and whether anyone crossed a training boundary. Record one correction, give it an owner and repeat the drill after the correction is made. That is how a reading exercise becomes a practical readiness improvement.
A practical aed use checklist
Use this list for preparation and review. During a real emergency, follow 911 instructions and current training.
- Open or power the unit immediately.
- Expose, dry and prepare only as needed.
- Use the diagrams on the actual pads.
- Visually clear, deliver if prompted and restart CPR.
- Call 911, use speaker mode and report observable changes while first aid continues.
- Give a short factual report and continue monitoring until care is transferred.
- Confirm that contact information, supplies and roles are current.
- Record one gap and assign the correction before the next practice session.
Continue building related skills
Read how AED pads are positioned and what a no-shock prompt means. Both pages are active parts of the MyCPR NOW learning library and reinforce the decisions around this topic.
Authoritative sources and further reading
- Food and Drug Administration public AED guide
- National Heart, Lung, and Blood Institute cardiac-arrest guide
- National Library of Medicine CPR overview
AED use is a disciplined loop: power, pads, clear, prompt and CPR. Practice it with the same equipment layout used in the real setting.
Explore structured instruction with MyCPR NOW CPR Certification.
