Cardiac arrest doesn't wait for a convenient moment, and neither should your response. By the end of this guide, you'll know the correct sequence for adult CPR based on current guidelines, from checking the scene to performing compressions and rescue breaths. No equipment is required beyond your hands and, if available, an AED. That said, reading through these steps is only the first layer of preparation. Completing a hands-on CPR certification course is the only way to build real muscle memory and confidence, because compression depth, rate, and rhythm are physical skills that need practice, not just knowledge.

Step 1: Check the Scene and the Person's Responsiveness

Before you touch anyone, scan your surroundings. Look for traffic, downed power lines, fire, unstable structures, or anything else that could hurt you if you rush in. A rescuer who becomes a second victim doesn't help anyone. If the environment isn't safe, don't enter it. Wait for the hazard to be controlled or for professionals who have the equipment to manage it.

Once you've confirmed it's safe to approach, kneel beside the person and check responsiveness. Tap their shoulders firmly and shout, "Are you okay?" Use a loud, clear voice. A person in cardiac arrest won't respond to a light touch or a quiet question, so don't be shy about being assertive here.

If there's no response, check for normal breathing. Look at the chest and abdomen for rise and fall, and do this for no more than 10 seconds. This part trips people up: gasping, snorting, or irregular gulping sounds are not normal breathing. This pattern, sometimes called agonal breathing, is actually a sign of cardiac arrest, not a sign the person is fine. If you see this, treat it the same as no breathing at all and move immediately to calling for help and starting compressions. Hesitating here, waiting to see if the breathing "sorts itself out," costs precious time the person's brain and heart don't have.

Step 2: Call 911 and Get an AED

If other people are nearby, resist the instinct to shout a general request for help. In a crowd, everyone assumes someone else will act, and nobody does. Instead, point directly at one specific person and give a clear instruction: "You, call 911." Point at another person: "You, find an AED." Assigning a task to a named individual, even by pointing, cuts through the diffusion of responsibility that causes bystanders to freeze.

If you're alone with the adult who needs help, call 911 yourself before starting compressions, and put the call on speakerphone so the dispatcher can guide you while your hands stay free to work. Dispatchers are trained to walk untrained bystanders through compressions in real time, so don't skip this call even if you feel unsure of what to do next.

Workplace safety coordinators should not wait for an emergency to learn where the nearest AED is. Common locations include break rooms, hallways near exits, reception areas, and gyms or fitness centers. Mapping AED locations in advance, and making sure staff know about them as part of workplace safety training, shaves critical minutes off response time. A device that's a two-minute walk away does no good if nobody remembers it exists.

Step 3: Position the Person and Your Hands Correctly

Lay the person flat on their back on a firm, flat surface. A soft mattress or couch cushion absorbs the force of compressions instead of transferring it to the heart, so move the person to the floor if needed. Kneel beside their chest, positioning your body so you can work directly over them.

Find the center of the chest, on the lower half of the breastbone, roughly between the nipples. Place the heel of one hand there, then stack your other hand on top and interlace your fingers. Keeping your fingers laced and lifted off the ribs helps concentrate the force where it needs to go.

Straighten your arms and position your shoulders directly over your hands, so your body forms something close to a vertical line from shoulders to wrists. This posture lets you use your body weight to drive compressions rather than relying on arm strength alone, which fatigues quickly and produces shallow, inconsistent compressions. Rock slightly from your hips rather than bending your elbows. Getting this positioning right in the first few seconds sets up everything that follows, since poor hand placement or bent arms make it almost impossible to sustain effective compressions for more than a minute or two.

Step 4: Perform Chest Compressions

With your hands and body positioned correctly, begin compressions. Push hard and fast: current American Heart Association guidance calls for a depth of at least 2 inches and a rate of 100 to 120 compressions per minute for adults. Resuscitation guidelines are reviewed and occasionally revised, so it's worth verifying you're working from the most current AHA standard as of 2026, especially if you're studying for certification.

A rate of 100 to 120 per minute is faster than most people expect, close to the tempo of a brisk walk set to a beat. Many CPR instructors use songs with a matching tempo to help students internalize the pace, since counting out loud while also pushing hard is harder than it sounds under stress.

Depth matters as much as speed. A shallow compression might move blood a little, but it won't generate enough pressure to circulate blood to the brain and heart effectively. After each compression, let the chest fully recoil, meaning it returns to its normal position before you push down again. This is called chest recoil, and it matters because leaning on the chest between compressions, even slightly, prevents the heart from refilling with blood, which reduces the amount your next compression can push out.

The most common mistake untrained or nervous rescuers make is holding back, compressing too shallow or too slow out of fear of hurting the person. It's true that forceful compressions can crack ribs or cause other injuries. But a broken rib heals. A person who doesn't get blood flow to their brain during cardiac arrest may not survive, or may survive with lasting brain damage. Push hard, push fast, and don't let fear of injury slow you down. If you feel or hear a rib crack, keep going. Stopping compressions is far more dangerous than continuing through it.

Step 5: Give Rescue Breaths (If Trained and Willing)

After 30 compressions, it's time for rescue breaths if you're trained and willing to give them. Tilt the person's head back slightly and lift their chin to open the airway, then pinch the nose shut and give two breaths, each lasting about one second. Watch the chest as you breathe in: you should see it rise, which confirms air is reaching the lungs rather than the stomach.

Not everyone is trained in rescue breaths, and not everyone is comfortable giving them to a stranger. That's fine. The American Heart Association recognizes hands-only CPR, continuous chest compressions without breaks for breathing, as an acceptable and effective alternative for adults who collapse suddenly, particularly for untrained bystanders. If you haven't taken a course or simply don't want to give breaths, keep compressing without pause rather than stopping care altogether. Continuous compressions still circulate oxygenated blood that's already in the bloodstream, which matters most in the first minutes of cardiac arrest.

If you do give breaths, avoid blowing too forcefully or for too long. Over-inflating the lungs pushes air past the airway and into the stomach instead, which can cause vomiting and complicate the airway further. A calm, controlled breath that produces visible chest rise is enough. There's no benefit to a bigger breath, and there's real risk in overdoing it. If your first breath doesn't produce chest rise, reposition the head and try again before returning to compressions.

Step 6: Continue the Cycle and Use the AED as Soon as It Arrives

Adult CPR follows a ratio of 30 compressions to 2 breaths, repeated in cycles. Keep this cycle going without stopping until one of three things happens: emergency help arrives and takes over, the person starts showing signs of life such as breathing normally or moving, or you're physically too exhausted to continue safely.

The moment an AED arrives, turn it on immediately. Modern AEDs are designed for use by untrained bystanders and will walk you through every step with voice prompts, including where to place the pads and when to stand clear. The device analyzes the person's heart rhythm and will tell you whether a shock is advised. If it is, the AED will instruct you to press the shock button and then tells you when to resume compressions. Follow its instructions exactly, and don't second-guess the device. It won't advise a shock unless the rhythm calls for one.

One instruction worth internalizing ahead of time: don't delay starting or continuing compressions to search for a pulse. Lay rescuers, meaning anyone without advanced medical training, are not expected to check for a pulse before or during CPR. Pulse checks are notoriously unreliable even for trained providers under stress, and time spent searching for one is time not spent circulating blood. If the person isn't breathing normally, start compressions and don't stop to verify further.

Step 7: Switch Rescuers and Hand Off to EMS

Compressions are physically demanding, and compression quality drops noticeably as fatigue sets in, even if the rescuer doesn't feel tired yet. If a second trained person is present, switch roles every 2 minutes, which works out to roughly five cycles of 30:2. Communicate clearly before switching, something as simple as "switch on the next cycle," so there's no confusion or gap in care.

If an AED is in use, time the switch to coincide with the device's rhythm analysis. The AED will already be pausing compressions to read the heart rhythm, so swapping rescuers during that natural pause avoids adding any extra interruption to compressions. Smooth handoffs like this keep the overall interruption time as close to zero as possible.

When EMS personnel arrive, they'll need a quick, clear handoff. Be ready to tell them when the person collapsed, whether you witnessed it or found them already down, how many shocks the AED delivered if any, and roughly how long CPR has been in progress. This information helps EMS make fast decisions about ongoing treatment. Stay calm, speak in short factual sentences, and let them take over compressions when they're ready. Your job isn't finished until trained providers have physically taken control of care.

Building Skills That Hold Up Under Pressure

Reading these steps is a starting point, not a substitute for hands-on practice. Compression depth, rate, hand placement, and rescue breaths are physical skills, and the only way to truly know you're doing them correctly is to practice them on a training manikin with an instructor watching and correcting your technique. Real emergencies are loud, fast, and stressful in ways that reading never fully prepares you for.

Enrolling in an accredited CPR and AED certification course lets you rehearse these exact steps under an instructor's feedback, so your hands know what to do even when your mind is racing. Don't wait until an emergency happens. Equip yourself with life-saving CPR skills that could make all the difference when seconds count. Register for a certification class today and gain the confidence to respond when someone needs help most.