What to Do if There Is a Pulse but No Breathing

When someone has a pulse but is not breathing, they need rescue breaths immediately. This condition, sometimes called respiratory arrest, means the heart is still circulating blood but oxygen is not getting in. Without intervention, oxygen levels plummet within minutes, and what started as a breathing emergency quickly becomes a full cardiac arrest. The response is straightforward in principle: open the airway, deliver one breath every five to six seconds for an adult, and keep checking the pulse. In practice, though, almost every step hides a pitfall that can trip up even trained responders.

How to Recognize the Situation

Before you can act, you need to confirm two things: that the person is not breathing normally, and that they do have a pulse. That sounds simple, but both checks are harder than people expect. Start by looking for chest rise and listening for air movement. If you see no chest movement and feel no air from the nose or mouth, breathing is absent or inadequate. Occasional gasping, gurgling, or snoring-like sounds do not count as normal breathing. These are signs of agonal breathing, which is present in up to roughly 40% of out-of-hospital cardiac arrests and is frequently mistaken for a sign that the person is still breathing on their own.¹ If someone is making infrequent, labored gasps with long pauses between them, treat it as no breathing.

Checking for a pulse is the other half of the assessment. Place two fingers on the side of the neck, in the groove between the windpipe and the large muscle running alongside it. Give yourself up to ten seconds. The trouble is that even healthcare professionals are not great at this. One study of trained professionals found that while they almost never missed a pulse that was there (sensitivity around 99%), they often “found” a pulse that wasn’t, with specificity as low as about 49% during a simultaneous pulse-and-breathing check.² In plain terms, about half the time someone without a pulse was incorrectly judged to have one. For laypeople, the error rate is likely even higher. If you are at all uncertain whether a pulse is present, the safest default is to start full CPR with chest compressions.

Delivering Rescue Breaths Step by Step

Once you are confident there is a pulse but no breathing, your job is to breathe for the person. Tilt their head back gently by lifting the chin with one hand and pressing the forehead down with the other. This head-tilt, chin-lift maneuver pulls the tongue away from the back of the throat, which is the most common obstruction in an unconscious person. If you suspect a neck or spinal injury, use a jaw-thrust instead: place your fingers behind the angles of the jaw on both sides and push the lower jaw forward without tilting the head.

Pinch the nose shut, make a seal over the mouth, and give one breath lasting about one second. Watch for the chest to rise. If it does, the breath got in. Wait five to six seconds, then give another. For a child (roughly ages one through puberty), the rate is slightly faster: one breath every two to three seconds. For an infant, use your mouth to cover both the nose and mouth, and deliver smaller, gentler puffs at the same rate as for a child.

After every two minutes of rescue breathing (roughly 20 to 24 breaths for an adult), pause briefly to recheck the pulse. Respiratory arrest can deteriorate into cardiac arrest without much warning. Research tracking patients in their final minutes before the heart stops shows a predictable cascade: oxygen saturation begins dropping sharply about 14 minutes before cardiac arrest, blood pressure follows about 8 minutes before, and heart rate collapses about 4 minutes before.³ The person may look stable and then suddenly lose their pulse. If at any recheck the pulse is gone, switch immediately to full CPR with chest compressions.

Why Rescue Breaths Alone, Not Chest Compressions

There is a reason public messaging around cardiac arrest has shifted toward hands-only CPR (compressions without breaths) for bystanders. In full cardiac arrest, the blood already holds enough residual oxygen for the first several minutes, so keeping it moving with compressions is the priority. But the “pulse but no breathing” situation is fundamentally different. The heart is doing its job of pumping. What is missing is new oxygen entering the lungs. Compressing the chest of someone whose heart is already beating accomplishes nothing useful and can cause unnecessary injury. The correct action is to supply what is absent: air.

This distinction confuses people because current bystander training often emphasizes compressions so heavily that rescue breathing feels like an afterthought. If you encounter someone who is not breathing but has a strong, regular pulse, compressions are not needed. Rescue breaths are the intervention. The exception, as noted above, is if you cannot confidently confirm a pulse. In that case, err on the side of starting full CPR.

Common Causes of Respiratory Arrest With a Pulse

Understanding why someone might stop breathing while their heart continues helps you anticipate the problem and respond more effectively. Several situations stand out:

Opioid overdose: Drugs like fentanyl, heroin, and prescription painkillers suppress the brain’s respiratory drive. The person gradually breathes more slowly and shallowly until breathing stops altogether, often while the heart keeps beating for several more minutes. Naloxone (Narcan) reverses this, but rescue breaths buy critical time while waiting for the drug to take effect or for emergency services to arrive.
Drowning: Water in the airway triggers laryngospasm, a reflex that clamps the vocal cords shut. The heart may continue beating for a short window, but no air gets in. Opening the airway and delivering breaths is the priority.
Choking that has progressed to unconsciousness: A foreign body that fully blocks the airway will stop breathing before it stops the heart. If abdominal thrusts or back blows clear the object, rescue breaths may be needed to restart breathing.
Severe allergic reaction: Anaphylaxis can swell the airway shut. Epinephrine is the definitive treatment, but if the airway is partially open, rescue breaths can keep some oxygen moving until help arrives.
Seizures and neurological events: Some seizures, strokes, or brain injuries temporarily knock out the brainstem’s respiratory center. The person may have a pulse but no respiratory effort.

In each of these, the window between respiratory arrest and cardiac arrest is narrow. Acting within the first minute or two dramatically improves the odds of a good outcome.

Using a Barrier Device or Pocket Mask

Mouth-to-mouth contact understandably makes many people hesitate. A pocket mask is a small, clear plastic device with a one-way valve that sits over the person’s nose and mouth, letting you blow in without direct contact. Research comparing ventilation methods during CPR by trained non-medical rescuers found that mouth-to-pocket-mask ventilation was effective about 92% of the time, comparable to direct mouth-to-mouth at around 91%, and both outperformed bag-valve-mask ventilation performed solo, which dropped to about 70% effectiveness.⁴ The rescuers in that study also rated the pocket mask as the easiest technique to use. Bag-valve masks, the squeeze-bag devices you see paramedics use, are harder to operate alone because you need one hand to hold the mask seal and the other to squeeze the bag, which often leads to air leaks.

A separate study comparing over-the-head techniques for single rescuers found that both pocket masks and bag-valve masks achieved high overall quality, but the pocket mask allowed more chest compressions and shorter interruption times.⁵ For a bystander acting alone, a pocket mask is the most practical tool. Many first aid kits include one, and they are small enough to carry in a glove compartment or backpack. If you do not have any barrier device, using a piece of thin cloth over the mouth is better than nothing, though it does not provide a one-way valve.

Avoiding Gastric Inflation

One of the most common mistakes during rescue breathing is blowing too hard or too fast. The airway and the esophagus sit right next to each other. If you deliver a breath with too much pressure, air takes the path of least resistance and enters the stomach instead of the lungs. This is called gastric inflation, and it creates a cascade of problems: the swollen stomach pushes up against the diaphragm, making the next breath even harder to deliver. Worse, it can cause the person to vomit, and vomit entering the lungs (aspiration) is a serious complication.⁶

The fix is to breathe gently and steadily. Deliver each breath over a full second, using just enough force to make the chest rise visibly. Think of it as a normal breath, not a forceful blow. If the chest does not rise, the problem is almost always the airway position, not the force. Retilt the head, re-lift the chin, and try again. Adding more force to overcome a blocked airway usually just inflates the stomach.

What to Do for Infants and Children

Respiratory arrest with a pulse is actually more common in children than in adults. In adults, the heart usually fails first and breathing stops as a consequence. In children, it often goes the other way: the breathing problem comes first, and the heart follows. This means rescue breathing is especially critical in pediatric emergencies, because catching the problem at the “pulse but no breathing” stage gives you the best chance of preventing cardiac arrest entirely.

For infants under one year, cover both the nose and mouth with your mouth and give small puffs, just enough to see the tiny chest rise. A common error is over-ventilating an infant with adult-sized breaths, which can damage the lungs or cause gastric inflation. For children between about one year and puberty, use the same mouth-to-mouth or pocket mask technique as for adults, but with slightly smaller breaths and a faster rate of one breath every two to three seconds. In both cases, recheck the pulse every two minutes. If you are alone with a child or infant who is not breathing, give two minutes of rescue breaths before leaving to call emergency services. This differs from the adult protocol, where you call first, because children are more likely to respond to early breathing support.

When Fear Gets in the Way

Knowing what to do and actually doing it are different things. Surveys of people trained in CPR consistently reveal that hesitation is widespread. In one workplace study, among those who expressed reluctance to perform bystander CPR, over half said they feared doing it incorrectly, about a fifth said they would skip mouth-to-mouth due to infection concerns (though they would still do compressions), and roughly 18% worried about injuring the victim.⁷

Each of these fears deserves a direct response. The risk of disease transmission through mouth-to-mouth ventilation is extremely low in practice, and using a pocket mask or even a piece of cloth reduces it further. The fear of causing harm by doing it wrong is understandable, but a person who is not breathing will die without intervention. An imperfect rescue breath is vastly better than no breath at all. And legally, Good Samaritan laws in most jurisdictions protect bystanders who act in good faith during an emergency. The single worst outcome is inaction.

Calling for Help and What Happens Next

Always call emergency services (or have someone else call) as soon as you recognize that a person is not breathing. Do not assume that a few rescue breaths will restart spontaneous breathing on their own. They might, particularly in drowning or short-duration choking, but in many cases the underlying cause requires medical treatment: naloxone for an opioid overdose, epinephrine for anaphylaxis, advanced airway management for structural obstructions.

While you continue rescue breathing, position the person on their back on a firm surface. If they vomit, roll them onto their side to let the vomit drain out, clear the mouth, and roll them back. Keep delivering breaths at the appropriate rate until one of three things happens: the person starts breathing on their own, emergency medical services arrive and take over, or the pulse disappears and you switch to full CPR. If the person does begin breathing independently, place them in the recovery position (on their side with the upper leg bent forward for stability) and monitor them closely. Breathing can stop again, especially if the underlying cause has not been treated.

Opioid Overdose and Naloxone

Opioid overdose deserves its own mention because it is one of the most common real-world scenarios where you encounter a pulse with no breathing. Fentanyl and related synthetic opioids have made this situation alarmingly frequent. Naloxone, available as a nasal spray without a prescription in many places, blocks the opioid receptors in the brain and can restore breathing within two to three minutes. But naloxone is not a substitute for rescue breaths. It takes time to work, and during that window the person is still not getting oxygen. Administer naloxone if you have it, then begin rescue breathing immediately. If the first dose of naloxone does not restore breathing within a few minutes, give a second dose if available. Continue rescue breaths throughout.

One thing that catches people off guard is that naloxone wears off faster than many opioids do. A person who wakes up and seems fine after naloxone can slip back into respiratory arrest 30 to 90 minutes later as the naloxone clears their system but the opioid is still active. This is why calling emergency services is non-negotiable even if the person appears to recover. They need monitoring that extends well beyond the immediate crisis.

Keeping Your Skills Current

Rescue breathing is a physical skill, and physical skills decay without practice. Studies on CPR retention consistently show that technique quality declines within months of training. If you took a first aid or CPR course more than two years ago, your ability to perform effective rescue breaths has likely deteriorated more than you realize. Many organizations offer refresher courses that take only a few hours, and practicing on a manikin even once a year makes a measurable difference in how well you perform under real pressure. Pocket masks and other barrier devices are inexpensive and widely available. Keeping one in your car, at your desk, or in a first aid kit means you are ready for the scenario most people only think about after it is too late.