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15 min Everyday EmergenciesCaring for Aging ParentsProtecting Young Kids

Cardiac Arrest & Hands-Only CPR

In 15 minutes you'll know how to recognize cardiac arrest, start hands-only CPR, and use an AED safely.

Print this course — or save it as a PDF from the print dialog. Good for a fridge, a glovebox, or a waiting room.

Why this matters

Cardiac arrest is not a heart attack. The heart's electrical system misfires, the heart stops pumping altogether, and blood stops moving to the brain within seconds. Nobody survives that without immediate help. For roughly every minute that passes without CPR, the odds of survival drop by about half (American Heart Association) — which means the person standing there when it happens decides how this goes, not the ambulance still minutes away.

Know the signs

Recognize cardiac arrest

Cardiac arrest looks like this: someone collapses and does not respond when you shout their name or shake their shoulders. Check for no more than ten seconds. If they will not wake up, this is an emergency — the next thing to check is whether they are breathing normally.

Gasping is not breathing. In the first minutes of cardiac arrest, many people make slow, snorting, or gasping sounds that can look like breathing from across the room. It is not. If a collapsed person is silent, or only gasping, treat it exactly like no breathing at all and start CPR.

Call 911, then start pushing

Call 911 yourself, or point at one specific person and tell them to call while you stay with the person who collapsed. If you are alone, put your phone on speaker and set it on the floor so your hands stay free for compressions.

If anyone else is nearby, send them to find an automated external defibrillator (AED) — often mounted on a wall in offices, gyms, and schools — while you begin pushing on the chest.

Push hard and fast, and do not stop

Kneel beside the person and place the heel of one hand on the center of their chest, with your other hand on top and fingers interlaced. Lock your elbows and push straight down using your body weight, not just your arms.

  • Rate: 100 to 120 pushes a minute — about two per second.
  • Depth: at least 2 inches deep in an adult.
  • Let the chest rise all the way back up between pushes.
  • Do not stop — not to check for a pulse, not because your arms are tired.
  • Keep going until paramedics take over or an AED is ready to check the heart's rhythm.

Hands-only CPR is exactly right

If you have not been trained, do not stop to give rescue breaths. Hands-only CPR — continuous chest compressions with no breaths — is what untrained bystanders are taught to do for an adult who collapses suddenly, and it works: the compressions alone keep a small amount of oxygen-carrying blood moving to the brain and heart.

You do not have to get this perfect. An imperfect rhythm and imperfect hand position still beat no CPR at all. Acting is always better than waiting for someone more qualified to show up.

An AED will not shock someone who does not need it

An automated external defibrillator (AED) is a small device that checks the heart's rhythm and delivers a shock only if the heart needs one to reset. It is built for untrained bystanders — turn it on and it talks you through every step out loud.

You cannot use it in a way that hurts someone. It analyzes the heart's rhythm before it will ever deliver a shock, and it will not shock a heart that does not need one. If it advises no shock, keep pushing on the chest. As soon as it arrives, use it — do not wait for paramedics to get there first.

This is awareness, not a hands-on class

Reading this course is not the same as practicing on a manikin with an instructor watching your technique. It removes the hesitation, but a hands-on CPR and AED class from the American Red Cross or American Heart Association builds real muscle memory. Both run short public classes in most communities — consider taking one.

How it really looks

A meeting, and a sound that isn't quite a snore

Colleen is presenting slides when Aaron, two seats down, slides out of his chair. He does not answer to his name, and the sound he makes is more snore than breath. She has never done this before, but she remembers one thing: gasping is not breathing. She sends one coworker to call 911 and another for the AED by the elevator, then kneels and pushes hard on the center of his chest. The AED arrives, talks her through the pads, and advises a shock. Paramedics take over minutes later. Aaron wakes up that night and is told the compressions were what kept him alive long enough to get there.

No contact, no warning, under the hoop

Rashid is refereeing a Saturday league game when a sixteen-year-old collapses with no contact from anyone. He is unresponsive, and the only sound from him is an occasional gasp. Rashid took one CPR class years ago, but he remembers hands-only and starts pushing on the center of the boy's chest without pausing to think about rescue breaths. A parent in the stands calls 911 and runs over the gym's AED. It advises a shock, then says to resume compressions. By the time paramedics arrive, the teen is breathing on his own and starting to stir. He plays again the following season.

What to do until help arrives

  1. Check responsiveness. Tap their shoulders and shout. No response means an emergency.
  2. Call 911 yourself on speakerphone, or point at one specific person and tell them to call.
  3. Send someone for an AED if others are nearby, and have them bring it straight to you.
  4. Push hard and fast on the center of the chest — 100 to 120 times a minute, at least 2 inches deep.
  5. Do not stop compressions to check for a pulse or breathing again — keep going.
  6. As soon as the AED arrives, turn it on and follow its spoken instructions exactly.
  7. Keep pushing until paramedics physically take over, even if that takes several minutes.

Myths & mistakes

People often think CPR requires mouth-to-mouth breathing to work.Actually for an untrained bystander helping an adult who collapsed, hands-only CPR — compressions with no breaths — is what's recommended, and it saves lives on its own.

People often think an AED could accidentally shock someone who does not need it.Actually the device checks the heart's rhythm first and only allows a shock if one is needed.

People often think CPR on someone whose heart is still working could seriously hurt them.Actually serious injury from unnecessary CPR is rare, and a cracked rib heals. The risk of doing nothing is far greater.

What you learned

  • Gasping is not breathing — it means start CPR immediately, not wait and watch.
  • Push hard and fast: 100 to 120 times a minute, at least 2 inches deep, center of the chest.
  • Hands-only CPR, with no rescue breaths, is exactly what untrained bystanders should do.
  • AEDs are safe: they check the heart first and will not shock someone who does not need it.
  • This course is awareness — a hands-on Red Cross or AHA class builds the real skill.

Sources

  1. American Heart Association — Hands-Only CPR and automated external defibrillator (AED) basics
  2. American Red Cross — Adult CPR and AED classes for the public

Common questions

What if I've never taken a CPR class? Can I still help?

Yes. Hands-only CPR is built for exactly this. You do not need training to push hard and fast on the center of someone's chest, and it works whether or not you have ever practiced. A 911 dispatcher can also coach you through it in real time if you stay on speakerphone. Doing something imperfect beats waiting for someone more qualified.

What if I push too hard and break a rib?

It happens sometimes, and it heals. A cracked rib from CPR is a far better outcome than a heart and brain with no blood flow. Rescuers are taught to push hard enough that it feels like more force than seems polite — that is the correct amount, not a mistake.

Is hands-only CPR really as good as CPR with rescue breaths?

For an adult who suddenly collapses in front of an untrained bystander, hands-only CPR is what's recommended, because it is simpler to remember under stress and keeps compressions going without interruption. If you have not been trained, compressions alone are the right call — and far better than doing nothing.

Check what you know

Five questions. Four correct to pass. Retake as many times as you like — this is practice, not a test.

This course belongs to Everyday Emergencies · Caring for Aging Parents · Protecting Young Kids. Courses that pair well with it:

Heart Attack: Know the Signs In 12 minutes you'll know the classic heart attack signs, the different signs women and people with diabetes often get instead, and exactly what to do. 12 min Everyday EmergenciesCaring for Aging Parents Choking: Infants, Children, Adults In 15 minutes you'll know how to help someone who's choking, and why babies need a different technique. 15 min Everyday EmergenciesCaring for Aging ParentsProtecting Young Kids Drowning: Silent and Fast In 10 minutes you'll know what drowning actually looks like, what to do in the first minute, and what a water scare does and doesn't mean afterward. 10 min Protecting Young Kids