Low-Cost Mechatronic Devices for Assisted CPR: Emerging Prototypes

Last Updated On: October 16, 2026
A healthy adult at rest breathes 12 to 20 times per minute. That is the range to measure against, and it applies at rest, not during or just after activity.
Every count falls into one of four bands. Find the one your number lands in and follow the instruction next to it.
| Breaths per minute | What it means | What to do |
| 12 to 20 | Normal at rest | Nothing. Recheck if symptoms develop. |
| 21 to 24 | Mildly elevated | Rest 10 minutes and recount. Look for a cause: pain, fever, anxiety, exertion. |
| 25 or more, or 9 to 11 | Significantly abnormal | Seek medical evaluation the same day. |
| 8 or fewer, or struggling | Emergency | Call 911 now. |
Children breathe faster than adults, and the younger the child, the faster the normal rate. Measuring a child against the adult range will make a healthy child look dangerously fast.
| Age | Normal breaths per minute |
| Newborn to 1 year | 30 to 60 |
| 1 to 3 years | 24 to 40 |
| 3 to 6 years | 22 to 34 |
| 6 to 12 years | 18 to 30 |
| 12 years and older | 12 to 20 |
Most inaccurate readings come from the person knowing they are being counted. Breathing is partly voluntary, so attention changes it.
Keep a hand on the wrist as though you are taking a pulse, and watch the chest or abdomen while you do. The person assumes you are counting heartbeats and breathes normally.
Count one rise and one fall as a single breath. Counting for 15 seconds and multiplying by four magnifies every error by four and misses irregular patterns entirely, which are often the thing that matters most.
Wait at least five minutes after any activity. A rate taken straight after walking across a room tells you nothing useful.
Write down whether breathing is shallow or deep, regular or irregular, quiet or noisy. A rate of 18 that is shallow, labored and noisy is a more serious finding than a quiet, easy 24.
Fast breathing, called tachypnea, is a symptom rather than a diagnosis. Common causes include fever, pain, anxiety and panic, asthma, pneumonia and other respiratory infections, heart failure, anaemia, blood loss and metabolic conditions such as diabetic ketoacidosis.
Hyperventilation is a particular pattern of fast breathing in which the person blows off carbon dioxide faster than the body produces it. The result is a familiar cluster: lightheadedness, tingling in the fingers and around the mouth, chest tightness and a strong sense that they cannot get enough air. It is frightening and usually not dangerous on its own.
Stay with them and keep your own voice slow and level. Ask them to breathe in through the nose for a count of four and out through pursed lips for a count of six, and count out loud with them. Loosen tight clothing. Do not use a paper bag: it is outdated advice and it is dangerous if the real cause is asthma, a heart problem or a clot rather than anxiety.
If the symptoms do not settle within a few minutes, or if there is chest pain, a bluish color to the lips or fingers, or any suspicion of asthma or a cardiac cause, treat it as a medical emergency and call 911.
Slow breathing, called bradypnea, is less common and often more serious, because the usual causes suppress the drive to breathe. Opioids and other sedatives, alcohol in large quantities, head injury, stroke and severe hypothyroidism all slow respiration.
An adult breathing fewer than eight times a minute is an emergency regardless of how calm they appear. Slow breathing is frequently the last stage before breathing stops altogether, and it is easy to mistake for sleep.
Stop counting and call 911 if you see any of these:
The most consequential mistake in this whole topic is treating agonal gasping as breathing. In the first minutes of cardiac arrest, many people take occasional slow, noisy, gasping breaths. They can look like a few breaths a minute and they sound like snoring, snorting or gurgling. Bystanders see movement, conclude the person is breathing, and wait.
Agonal gasping is a sign of cardiac arrest, not a sign of life. If someone is unresponsive and not breathing normally, including gasping like this, call 911 and start chest compressions immediately. You will not harm someone whose heart is still beating by starting compressions, and you will almost certainly kill someone whose heart has stopped by waiting.
This single recognition point is the reason hands-on practice matters more than reading about it. An online CPR certification teaches you to recognize agonal breathing on sight and to move straight to compressions without the pause that costs survival.
If a person has a pulse but is not breathing adequately, give rescue breaths at the rate for their age group. If there is no pulse, give chest compressions.
| Situation | Rate |
| Adult rescue breathing, pulse present | 1 breath every 6 seconds (10 per minute) |
| Child or infant rescue breathing, pulse present | 1 breath every 2 to 3 seconds (20 to 30 per minute) |
| Adult CPR, single rescuer, no advanced airway | 30 compressions to 2 breaths |
| Child or infant CPR, two rescuers | 15 compressions to 2 breaths |
| Any age with an advanced airway in place | 1 breath every 6 seconds, compressions continuous |
Each breath lasts about one second and should be just enough to make the chest visibly rise. Larger or faster breaths force air into the stomach, which causes vomiting and makes the airway harder to manage.
Counting a breathing rate is simple. Knowing what to do when the number is wrong is the part that needs training. Certification covers recognition, rescue breathing and chest compressions in one session, and you can complete it online in an afternoon. Start with CPR certification if you want the core skills, BLS certification if your employer requires it, or the healthcare provider course if you work in a clinical setting.
Six questions, each answered in one self-contained paragraph. This page currently has no FAQ section, so this is a net addition.
A healthy adult at rest breathes 12 to 20 times per minute. Measure at rest, at least five minutes after any activity, because exertion raises the rate normally. A count of 21 to 24 is mildly elevated and worth rechecking after ten minutes of rest while you look for a cause such as pain, fever or anxiety. A count of 25 or more, or 9 to 11, warrants medical evaluation the same day. Fewer than eight breaths per minute, or any sign that the person is struggling to breathe, is an emergency and needs 911 regardless of the number itself.
Do not tell the person you are counting, because breathing is partly voluntary and awareness changes it. Rest your fingers on their wrist as though taking a pulse and watch the chest or abdomen while you do. Count one full rise and fall as a single breath, and count for a full sixty seconds rather than counting fifteen seconds and multiplying, which magnifies any error fourfold and hides irregular patterns. Record the quality as well as the number: shallow, labored or noisy breathing at a normal rate can matter more than a slightly fast rate that is quiet and easy.
A rate of 22 is above the normal adult range but is not by itself an emergency. Treat it as a prompt to look for a reason. Rest for ten minutes and recount, since recent activity, pain, fever, anxiety or a recent cigarette can all push the rate into the low twenties temporarily. If the recount is still above 20 and there is no obvious explanation, or if it comes with chest pain, shortness of breath, fever or a bluish color to the lips, arrange medical evaluation the same day. A persistent unexplained rise in breathing rate is an early marker of several serious conditions.
Agonal breathing is the occasional slow, noisy gasping that many people do in the first minutes of cardiac arrest. It often sounds like snoring, snorting or gurgling, and it can look like a few breaths per minute. It is a sign of cardiac arrest, not a sign of life, and mistaking it for breathing is one of the most common reasons bystanders delay CPR. If a person is unresponsive and not breathing normally, including gasping like this, call 911 and begin chest compressions immediately rather than waiting to see whether the breathing improves.
No. Paper bag breathing is outdated advice and can be dangerous, because the symptoms of hyperventilation overlap with asthma, heart problems and blood clots in the lung. Rebreathing carbon dioxide in any of those situations makes the underlying problem worse. Instead, stay with the person, keep your voice slow and level, and coach a steady pattern: in through the nose for a count of four, out through pursed lips for a count of six, counting aloud with them. If symptoms persist beyond a few minutes, or there is chest pain or a bluish color, call 911.
For an adult who has a pulse but is not breathing adequately, give one breath every six seconds, which is ten per minute. For a child or infant with a pulse, give one breath every two to three seconds, which is twenty to thirty per minute. During CPR on an adult without an advanced airway, use thirty compressions to two breaths as a single rescuer. With an advanced airway in place, give one breath every six seconds while compressions continue without pausing. Each breath should last about one second and be just large enough to make the chest visibly rise.