The correct ventilation rate during adult CPR is 2 breaths after every 30 chest compressions. This 30:2 ratio is the current standard from the American Heart Association for both trained bystanders and healthcare professionals. The rate changes depending on the patient’s age, whether you’re alone or have help, and whether advanced equipment is in place.
Adult CPR: The 30:2 Ratio
For adults in cardiac arrest, you perform 30 chest compressions followed by 2 rescue breaths, then repeat. Each breath should last about one second, and you should watch for the chest to visibly rise before giving the second breath. If the chest doesn’t rise, reposition the head by tilting it back and lifting the chin before trying again.
If the person has a pulse but isn’t breathing normally, the situation calls for rescue breathing only, without compressions. In that case, give 1 breath every 6 seconds, which works out to about 10 breaths per minute.
Child and Infant CPR Rates
For children and infants, a single rescuer uses the same 30:2 ratio as adult CPR. When a second rescuer is available, the ratio shifts to 15 compressions for every 2 breaths. The faster cycle reflects the fact that breathing problems, rather than heart problems, are more often the cause of cardiac arrest in young patients, so ventilation carries extra importance.
If a child or infant has a pulse but isn’t breathing, provide 1 breath every 2 to 3 seconds, or roughly 20 to 30 breaths per minute. That’s significantly faster than the adult rate of 10 breaths per minute.
Newborns follow a different protocol entirely. Neonatal resuscitation uses a 3:1 ratio of compressions to ventilations, coordinated so that three compressions are immediately followed by one breath in a smooth, repeating cycle.
Ventilation With an Advanced Airway
Once a healthcare team places an advanced airway (a tube into the throat or a device that seals over it), the rules change. Compressions and breaths no longer need to alternate in cycles. Instead, one rescuer compresses continuously while another delivers 1 breath every 6 seconds, targeting 10 breaths per minute. The compressions don’t pause for ventilation.
Interestingly, recent data suggests that slightly higher rates may actually help. A study of in-hospital cardiac arrest patients found that those ventilated at more than 12 breaths per minute had higher rates of return of spontaneous circulation compared to those kept at 6 to 12 breaths per minute. Rates between 12 and 26 breaths per minute appeared to improve blood flow. A separate analysis from the Pragmatic Airway in Resuscitation Trial found that mild hyperventilation (12 to 16 breaths per minute) was associated with better neurological outcomes compared to the standard 6 to 12 range. Despite this, international resuscitation bodies have not yet changed the official recommendation of 10 breaths per minute, noting the evidence isn’t strong enough to shift the guideline.
Why Too Many Breaths Can Be Harmful
One of the most common mistakes during CPR is ventilating too fast. It’s a natural instinct, especially under stress, but it can genuinely reduce a person’s chance of survival.
Every time you push air into someone’s lungs, pressure builds inside the chest. During the recoil phase of compressions, the chest needs to generate negative pressure to pull blood back into the heart. Excessive ventilation keeps that pressure elevated, which means less blood flows back to the heart between compressions. In animal studies, increasing the breathing rate from 12 to 30 breaths per minute nearly doubled the pressure inside the chest and significantly dropped coronary perfusion pressure, the force that pushes blood through the heart’s own arteries. Survival rates dropped alongside it.
The takeaway from international guidelines is straightforward: both over-ventilating and under-ventilating can cause harm. Staying close to the recommended rate matters more than most people realize.
How to Deliver an Effective Breath
Each rescue breath should last about one second. That’s it. A slow, steady breath is more effective than a forceful one. You’re looking for the chest to rise just visibly, not dramatically. Over-inflating the lungs increases the risk of pushing air into the stomach, which can lead to vomiting and complicate the resuscitation.
To get a good seal, tilt the head back, lift the chin, and pinch the nose closed before breathing into the mouth. For infants, your mouth covers both the nose and mouth. If you have a pocket mask or bag-valve mask, the same one-second breath with visible chest rise applies.
Quick Reference by Age Group
- Adults (single or two rescuers): 30 compressions to 2 breaths. Rescue breathing alone: 1 breath every 6 seconds (10 per minute).
- Children and infants (single rescuer): 30 compressions to 2 breaths. Rescue breathing alone: 1 breath every 2 to 3 seconds (20 to 30 per minute).
- Children and infants (two rescuers): 15 compressions to 2 breaths.
- Newborns: 3 compressions to 1 breath.
- Any age with advanced airway: 1 breath every 6 seconds (10 per minute), continuous compressions without pausing.