If you’re checking for breathing and hear gasps, treat the person as if they are not breathing and begin CPR immediately. Gasping in an unresponsive person is not normal breathing. It is a sign of cardiac arrest, and the person needs chest compressions right away.
This is one of the most critical moments in an emergency, and it’s also one of the most commonly misread. About 40% of people in cardiac arrest will gasp, and bystanders who witness it frequently mistake it for real breathing. That hesitation costs lives.
Why Gasping Is Not Real Breathing
The gasps you hear during cardiac arrest are called agonal breaths. They come from the lower part of the brainstem, which continues firing for a short time after the heart stops and oxygen to the brain drops. These are not voluntary breaths. They don’t move enough air into the lungs to sustain life. The 2025 American Heart Association guidelines define them as “slow, irregular gasping respirations that are ineffective for ventilation.”
Agonal breaths can sound like a lot of things, which is part of why they confuse people. Bystanders have described them as snoring, gurgling, moaning, snorting, or labored breathing. There’s no single consistent sound. The breaths may come several seconds apart, and the person’s chest may barely move. Unlike normal breathing, which is rhythmic and steady, agonal gasps are irregular, infrequent, and often noisy in a way that sounds wrong even if you can’t immediately explain why.
Why Bystanders Hesitate
Gasping is the most common reason bystanders fail to recognize cardiac arrest. When someone collapses and appears to still be breathing, even strangely, the instinct is to wait or assume they’re okay. Research backs this up: when a cardiac arrest victim showed no breathing at all, about 83% of bystanders started CPR. But when the victim was gasping, only 54% did. That gap is significant. Every minute without CPR reduces a person’s chance of survival by roughly 7 to 10%.
People who actually witness the collapse are, paradoxically, less likely to start CPR than those who find someone already unconscious. Seeing someone go from conscious to gasping and unresponsive is alarming and disorienting. The gasping looks like it could be something else: a seizure, fainting, heavy sleep. But if a person is unresponsive and their breathing sounds abnormal or irregular, the correct response is always to act.
What You Should Do Step by Step
If you find someone unresponsive, tap their shoulders and shout to check for a response. If they don’t respond, look at their chest and listen for breathing for no more than 10 seconds. If you hear gasping, irregular breaths, or nothing at all, that person needs CPR.
- Call 911 (or have someone nearby call) before you start compressions. Put the phone on speaker if you’re alone.
- Start chest compressions. Push hard and fast in the center of the chest, at least 2 inches deep, at a rate of 100 to 120 compressions per minute. If you don’t know rescue breathing, hands-only CPR is effective.
- Don’t stop until emergency responders arrive or the person starts to move and breathe normally.
This applies to adults, children, and infants. The guideline is the same across all age groups: unresponsive plus no normal breathing or only gasping equals start CPR.
How 911 Dispatchers Identify Gasping
If you call 911 and aren’t sure whether someone is breathing normally, the dispatcher will walk you through it. Dispatchers are trained to ask specifically about gasping, which they define as breathing that is slow, barely present, or slow with noisy or gurgling sounds. If there’s still uncertainty, the dispatcher may ask you to hold the phone near the person’s mouth so they can listen, or ask you to say “now” each time the person takes a breath. If the breaths are far apart and irregular, the dispatcher will instruct you to begin CPR.
Don’t hang up. The dispatcher will stay on the line and guide your compressions until paramedics arrive.
Gasping Actually Signals a Better Chance of Recovery
Here’s something most people don’t know: the presence of agonal gasping is actually a positive sign, not a hopeless one. Those gasps indicate the brainstem still has some activity, which means the brain hasn’t been without oxygen for too long. When a gasping person inhales, the negative pressure in the chest not only pulls air into the lungs but also helps draw blood back into the heart, improving circulation to the brain and coronary arteries.
Studies have found that cardiac arrest patients who exhibit agonal breathing tend to have better neurological outcomes than those who don’t gasp at all. In some cases, the presence of ongoing agonal breathing is a stronger predictor of brain recovery than the type of heart rhythm recorded on arrival. This makes it all the more urgent to start CPR immediately: you’re working with a person whose brain still has a fighting chance, and compressions help extend that window.
The Key Rule to Remember
If someone is unresponsive and you’re unsure whether what you’re hearing counts as breathing, start CPR. You will not harm someone by performing chest compressions on a person who turns out not to need them, but you can absolutely harm someone by waiting while their brain goes without oxygen. Gasping, gurgling, snoring sounds, or long pauses between breaths in an unconscious person all point to the same thing: a heart that has stopped and a body that needs help now.