Chest-only CPR, also called hands-only CPR, is cardiopulmonary resuscitation performed without rescue breaths. It has two core features: calling 911 and pushing hard and fast in the center of the chest at a rate of 100 to 120 compressions per minute. The American Heart Association recommends it for any bystander who witnesses a teen or adult suddenly collapse.
Two Steps, No Breathing Required
The defining feature of chest-only CPR is its simplicity. The entire technique boils down to two actions: call 911, then begin chest compressions. There is no need to tilt the head, seal your mouth over the person’s, or pause compressions to deliver breaths. This makes it accessible to anyone, even people with no formal CPR training.
For adults experiencing sudden cardiac arrest outside a hospital, hands-only CPR performed by a bystander is as effective as traditional CPR with rescue breaths in the first few minutes. The heart has just stopped, so the blood still carries oxygen. What the person needs most is for that oxygenated blood to keep moving, and chest compressions do exactly that.
Compression Rate and Depth
The target compression rate is 100 to 120 pushes per minute. A useful way to hold that rhythm is to compress to the beat of “Stayin’ Alive” by the Bee Gees, which sits right at about 104 beats per minute. The American Heart Association even publishes playlists of popular songs in the 100 to 120 BPM range to help people internalize the tempo.
Each compression should push the chest down at least 2 inches (5 centimeters) but no more than 2.4 inches (6 centimeters). That range is surprisingly deep, and it takes real force. You should use your upper body weight rather than just your arm muscles to achieve it. Between compressions, let the chest fully recoil back to its resting position so the heart can refill with blood before the next push.
Proper Hand and Body Position
Place the heel of one hand in the center of the person’s chest, on the lower half of the breastbone. Stack your other hand on top and interlace your fingers. Keep your arms straight and your shoulders directly over your hands so you’re pressing straight down rather than at an angle. This alignment lets gravity and your body weight do most of the work, which matters because chest compressions are physically exhausting. If another bystander is available, switch off every two minutes to prevent fatigue from weakening your compressions.
How Compressions Keep Blood Flowing
When you compress the chest, you’re physically squeezing the heart between the breastbone and the spine, forcing blood out to the brain and other organs. Each compression also generates a small amount of air movement in and out of the lungs. Animal studies have shown that compressions produce small tidal volumes of air with each push, though these passive breaths are quite limited. In human measurements, the volume of air moved per compression (around 40 milliliters) fell well below what’s needed for normal gas exchange.
This is why chest-only CPR works best in the first several minutes after a sudden cardiac arrest. The blood still holds enough residual oxygen to sustain the brain for a short window. The compressions keep that oxygen circulating. As minutes pass without ventilation, oxygen levels drop, which is one reason paramedics take over with full advanced care as quickly as possible.
When Chest-Only CPR Is Not Enough
Hands-only CPR is designed for a specific scenario: a teen or adult who suddenly collapses from a cardiac event. In several other situations, rescue breaths are a critical addition because the underlying problem is a lack of oxygen, not just a lack of circulation.
- Drowning: The lungs are full of water and need air delivered directly.
- Drug overdose: Opioids and other substances suppress breathing, so the person may have been oxygen-deprived for minutes before the heart stopped.
- Choking or airway obstruction: No air is reaching the lungs at all.
- Children and infants: Pediatric cardiac arrests are more often caused by breathing problems than by heart rhythm failures, making ventilation essential.
- Trauma: Significant blood loss and injury often accompany respiratory failure.
The data on children illustrates the difference clearly. A meta-analysis in the Cardiology Journal found that the one-month survival rate for pediatric out-of-hospital cardiac arrest was 12.3% with hands-only CPR compared to 18.0% with conventional CPR that included rescue breaths. Favorable neurological outcomes followed the same pattern: 6.3% versus 9.0%. For kids, the breaths matter.
Why It Increases Bystander Response
One of the most important features of chest-only CPR is psychological, not mechanical. Removing mouth-to-mouth contact lowers the barrier for bystanders to step in. Large-scale data from Japan showed that wider promotion of compression-only CPR was associated with a measurable increase in bystander-initiated CPR rates and, at the population level, higher survival with favorable neurological outcomes after out-of-hospital cardiac arrest.
Interestingly, the reluctance to perform mouth-to-mouth may be smaller than assumed. One U.S. study found only 1.1% of actual bystanders cited mouth-to-mouth contact as their reason for not performing CPR. Other barriers, like fear of doing it wrong or not recognizing cardiac arrest, play a larger role. Still, simplifying the technique to “just push” gives hesitant bystanders a clear, memorable action plan when seconds count.
Using an AED Alongside Compressions
If an automated external defibrillator is nearby, it pairs directly with chest-only CPR. Have someone grab the AED while you continue compressions. When the device arrives, turn it on and follow the voice prompts. It will tell you to place pads on the person’s chest, and it will analyze the heart rhythm automatically. If a shock is advised, the machine will instruct you to stand clear and press the shock button. Resume compressions immediately after the shock. The goal is to minimize any pause in compressions, keeping blood moving to the brain until paramedics arrive.