Yes, you can perform CPR without rescue breaths, and for most adult cardiac emergencies, it’s exactly what major health organizations recommend bystanders do. The American Heart Association calls it Hands-Only CPR: chest compressions without mouth-to-mouth breathing, designed for anyone who witnesses a teen or adult suddenly collapse. It works because when someone’s heart stops, their blood still carries enough oxygen to keep the brain and organs alive for several minutes. Compressions push that oxygenated blood where it needs to go.
Why Compressions Alone Work
When a person’s heart suddenly stops beating, their lungs and bloodstream don’t instantly run out of oxygen. There’s still a usable reserve. Chest compressions create artificial circulation by increasing pressure inside the chest cavity, squeezing the heart and pushing blood forward through the body. Done correctly, manual compressions can deliver up to 33% of normal cardiac output. That’s enough to keep brain cells alive and maintain blood flow to the heart muscle itself, which is critical for restarting it.
Hands-Only CPR has been shown to be as effective as conventional CPR with breaths during the first few minutes of an out-of-hospital cardiac arrest in adults. A large meta-analysis comparing the two approaches found survival to hospital discharge was 9.3% with compression-only CPR and 10.2% with standard CPR, a difference that was not statistically significant. Neurological outcomes were also nearly identical: 5.8% versus 6.5% left the hospital with good brain function. In practical terms, for a bystander responding to a sudden adult collapse, adding breaths does not meaningfully improve survival.
How to Perform Hands-Only CPR
The technique is straightforward, which is part of why it saves more lives. Here’s what to do:
- Call 911 first. If someone else is nearby, have them call while you start compressions. If you’re alone, call before you begin.
- Position the person. Make sure they’re on their back on a firm, flat surface.
- Place your hands correctly. Kneel beside them. Put the heel of one hand in the center of their chest, place your other hand on top, and interlace your fingers. Keep your fingers lifted off the chest so only the heel of your hand makes contact.
- Lock your arms. Position your shoulders directly over your hands with your elbows locked straight. Your body weight does the work, not your arm muscles.
- Push hard and fast. Compress at least 2 inches deep at a rate of 100 to 120 compressions per minute. Let the chest fully rise back to its normal position between each compression.
- Don’t stop. Keep going until emergency medical services arrive or an automated external defibrillator (AED) becomes available.
The rate of 100 to 120 per minute roughly matches the tempo of the Bee Gees’ “Stayin’ Alive,” which is the classic memory aid for a reason. Depth matters just as much as speed. Shallow compressions don’t generate enough pressure to move blood effectively.
When Rescue Breaths Still Matter
Hands-Only CPR is designed for one specific scenario: a witnessed sudden collapse in a teen or adult, which is most commonly caused by a heart rhythm problem. In those cases, the issue is circulation, not oxygen. But some emergencies are different because the person ran out of oxygen before their heart stopped, and compressions alone won’t address the root problem.
Drowning is the clearest example. A drowning victim’s cardiac arrest is driven by a lack of oxygen, not an electrical malfunction of the heart. The 2024 AHA guidelines specifically state that compression-only CPR has been associated with reduced survival in drowning victims compared to CPR with breaths. Trained rescuers should provide rescue breaths as part of drowning resuscitation. That said, if you’re untrained or unwilling to give breaths, compression-only CPR is still far better than doing nothing.
Drug overdoses and choking follow a similar pattern. When breathing stops first and the heart follows, the oxygen reserves in the blood are already depleted by the time the heart gives out. Breaths become important because there’s nothing useful left to circulate.
Children and Infants Need Breaths
Cardiac arrest in children is rarely caused by a heart rhythm problem. It almost always starts as a breathing emergency, whether from choking, asthma, infection, or injury. By the time a child’s heart stops, their oxygen supply is typically exhausted. The 2025 AHA and American Academy of Pediatrics guidelines are clear: for infants and children, providing breaths in addition to chest compressions improves survival. Large observational studies consistently show better outcomes with conventional CPR at either a 30:2 or 15:2 compression-to-breath ratio compared to compressions alone.
If you’re a bystander who isn’t trained in rescue breathing, compression-only CPR for a child is still significantly better than no CPR at all. But if you’re able and willing to give breaths, do it.
Simpler CPR Saves More Lives
One of the strongest arguments for Hands-Only CPR isn’t physiological. It’s psychological. Many bystanders who witness a cardiac arrest hesitate to act because they don’t want to perform mouth-to-mouth on a stranger. Removing that barrier has had a measurable effect. A Swedish study tracking over 30,000 out-of-hospital cardiac arrests found that bystander CPR rates jumped from 40.8% in the early 2000s to 68.2% by 2017. The increase was driven almost entirely by more people performing compression-only CPR. Similar trends have been documented in the United States and Japan.
The math is simple. A person in cardiac arrest who receives no CPR loses about 10% of their survival chance with every passing minute. Any compressions at all are dramatically better than none. By making CPR less intimidating, the Hands-Only approach has likely saved thousands of lives that would have been lost to bystander hesitation.