Rescue breathing is a technique where you blow air into someone’s lungs when they’ve stopped breathing on their own but still have a pulse. It’s different from full CPR, which combines breaths with chest compressions for someone whose heart has also stopped. In rescue breathing, the goal is simple: keep oxygen flowing to the brain and organs until the person starts breathing again or emergency help arrives.
When Rescue Breathing Is Needed
Rescue breathing applies to a specific situation: the person is unconscious and not breathing (or only gasping), but you can still feel a pulse. This is called respiratory arrest, and it happens in scenarios where something has shut down the body’s drive or ability to breathe while the heart keeps working, at least temporarily.
The most common situations include opioid overdoses, drowning, choking that has been partially cleared, severe allergic reactions, and carbon monoxide or smoke inhalation. Children are especially likely to need rescue breathing because pediatric emergencies more often start as breathing problems rather than heart problems. For this reason, the American Heart Association recommends that 911 dispatchers guide bystanders to give breaths during CPR for children, while adults in cardiac arrest can receive hands-only (compression-only) CPR from untrained bystanders.
If you find someone unresponsive with no pulse, they need full CPR, not rescue breathing alone. The distinction matters because chest compressions without a heartbeat are what circulate blood. Rescue breathing without compressions only works when the heart is still doing its job.
How to Perform Rescue Breathing
Before giving any breaths, you need to open the person’s airway. When someone is unconscious, the tongue and soft tissues in the throat tend to collapse backward and block airflow. The standard technique is a head-tilt chin-lift: place one hand on the forehead and gently tilt the head back while lifting the chin forward with your other hand. If you suspect a neck or spinal injury, a jaw-thrust maneuver (pushing the jaw forward without moving the head) is preferred, though if that doesn’t produce visible chest rise, switching to the head-tilt chin-lift is recommended because getting air into the lungs takes priority.
Once the airway is open, pinch the person’s nose shut, create a seal over their mouth with yours, and give a breath lasting about one second. Watch for the chest to visibly rise. If it doesn’t, reposition the head and try again. Each breath should be just enough to make the chest rise, not a forceful blow. Overinflating the lungs pushes air into the stomach instead, which can cause vomiting and complicate the rescue.
Timing for Adults
For adults, give one breath every 6 seconds, which works out to about 10 breaths per minute. A simple way to keep pace: give a breath, silently count to six, then give the next one. Between breaths, keep the airway open and watch the chest fall as air exits.
Timing for Infants and Children
Children and infants need breaths more frequently: one every 2 to 3 seconds, or roughly 20 to 30 breaths per minute. For infants, your mouth covers both the nose and mouth at once because the face is too small to seal just the mouth. Use smaller, gentler puffs for smaller bodies, just enough to see the chest rise.
Rescue Breathing During Opioid Overdose
Opioid overdoses are one of the most common reasons bystanders encounter someone who has stopped breathing. Opioids suppress the brain’s respiratory drive, so a person may still have a pulse but be barely breathing or not breathing at all. The World Health Organization recommends that first responders prioritize airway management and assisted ventilation alongside naloxone, the medication that reverses opioid effects.
If you have naloxone (commonly available as a nasal spray), give it as quickly as possible, but don’t wait for it to work before starting rescue breathing. Naloxone can take a few minutes to take effect, and the brain is accumulating damage every second it goes without oxygen. Rescue breathing bridges that gap. If the person stops responding to naloxone and slips back into overdose, additional doses may be needed because some opioids outlast naloxone’s effects.
Why Breathing Matters for Survival
Ventilation during resuscitation has a dramatic effect on outcomes. A study funded by the National Institutes of Health analyzed nearly 2,000 cardiac arrest patients treated by emergency responders and found that patients who received more ventilations during CPR were three times more likely to survive to hospital discharge (13.5% vs. 4.1%) compared to those who received very few breaths. The higher-ventilation group also had substantially better neurological outcomes: 10.6% survived with good brain function, compared to just 2.4% in the lower-ventilation group.
These numbers underscore a straightforward point. Chest compressions move blood, but without oxygen in that blood, the benefit diminishes. In situations where breathing failure is the primary problem, like drowning or overdose, ventilation is arguably the single most important intervention.
Avoiding Gastric Inflation
The most common complication of rescue breathing is gastric inflation, where air enters the stomach instead of the lungs. Research on prehospital resuscitation found that gastric inflation occurred in roughly 57% of cases overall, and the rate was even higher (about 69%) when a bag-valve mask was used by emergency responders. For bystanders giving mouth-to-mouth, the risk comes from blowing too hard or too fast.
Air forced into the stomach can cause the person to vomit, and if vomit enters the airway, it creates a much more dangerous situation. To minimize this risk, give slow, steady breaths lasting about one second each. Stop as soon as you see the chest rise. Resist the urge to give bigger breaths thinking more air is better.
Barrier Devices and Protection
Many people hesitate to perform mouth-to-mouth on a stranger, and that hesitation is one reason bystander rescue breathing rates are low. Barrier devices solve this problem. The two main options are pocket masks and face shields.
Pocket masks are rigid plastic masks with a one-way valve that sits over the person’s nose and mouth. They’re compact enough to carry in a bag or keep in a car, and studies show they deliver ventilation quality nearly identical to the bag-valve masks used by professionals. A trained non-medical rescuer can achieve adequate air volume with a pocket mask consistently. Face shields are thinner, disposable barriers that provide less of a seal but still reduce direct contact. For professional rescuers, bag-valve masks remain the preferred tool because they avoid any direct airway contact and can be connected to supplemental oxygen.
When Rescue Breathing Becomes Full CPR
Respiratory arrest can deteriorate into cardiac arrest within minutes if the brain and heart are starved of oxygen long enough. While performing rescue breathing, check for a pulse roughly every 2 minutes. If you can no longer feel one, switch immediately to full CPR: 30 chest compressions followed by 2 breaths, repeating in cycles. The 2025 American Heart Association guidelines reaffirm this 30:2 ratio for both lay rescuers and healthcare professionals before advanced airway equipment is available.
Acting quickly during that narrow window of respiratory arrest, before the heart stops, gives the person the best chance. The transition from “not breathing” to “no heartbeat” can happen in as little as a few minutes, which is why starting rescue breathing immediately rather than waiting for paramedics makes such a measurable difference in survival.