AED Basics: Using a Defibrillator with Confidence

Alan Pacheco
Oct 11
2 min read

An Automated External Defibrillator (AED) is one of the most powerful life-saving tools available — but only if people know how to use it. The great news is that modern AEDs are simple, safe, and built for bystanders to operate. This guide will help you feel confident using an AED during sudden cardiac arrest.

What an AED Does

When the heart stops beating effectively, an AED analyzes the heart rhythm and, if needed, delivers a controlled electric shock to restore a normal beat. Combined with CPR, AED use dramatically improves survival.

When to Use an AED

Someone is unresponsive and not breathing normally (gasping or no breath).
After calling 911 and starting CPR.
As soon as an AED is available — don’t wait.

Step-by-Step AED Use (AHA Recommended)

Turn It On: Open the lid or press the power button — the AED will start giving voice and/or
visual instructions.
Expose the Chest & Apply Pads
Remove clothing and dry skin if needed.
Place pads exactly as shown on the diagrams — one on the upper right chest, one on the lower left side.
Let the AED Analyze: Make sure nobody is touching the person. The AED will check the heart rhythm.
Deliver the Shock (if Advised): Press the flashing shock button when instructed, then immediately resume CPR.
Continue CPR: Follow the AED prompts — keep doing compressions and breaths as directed until help arrives or the person shows signs of life.

Safety Myths About AEDs

Myth: Only professionals can use them. Truth: AEDs are designed for anyone — no medical license required.
Myth: Shocks could hurt bystanders. Truth: If you follow prompts and don’t touch the person, AEDs are safe.
Myth: You can harm someone if you use it incorrectly. Truth: AEDs won’t shock unless needed.