Cardiopulmonary resuscitation (CPR): What you need to know
Created: November 2, 2017; Next update: 2020.
If someone is unconscious and not breathing normally, it’s very important to perform cardiopulmonary resuscitation (CPR) immediately. Doing so can save lives, for instance after a heart attack. In hospitals or doctors’ practices, medically trained staff can help fast in emergencies. Everywhere else, immediate first aid by other people is vital.
Then the main thing to do is stay calm and do the following:
|1.||Check whether the person is conscious and breathing normally.|
|2.||If they aren’t, call the emergency services (112 in Germany and many other countries, 911 in the U.S.).|
|3.||Start doing chest compressions.|
If you follow these three steps right away, you can’t go wrong. The most important thing is to start helping immediately! Don’t hesitate for fear of doing something wrong. Good to know: If you’re not trained in CPR, you don’t need to give rescue breaths. In this article we will only describe how to do CPR without rescue breaths (hands-only CPR).
If you have access to an automated external defibrillator (AED) and someone else is there to help, you can resuscitate the patient using that too. But make sure that you only stop performing chest compressions when the defibrillator device tells you to stop.
How can you check whether someone is unconscious?
Speak to them in a loud, clear voice (for instance: “Hello?! Can you hear me?!”) and gently but firmly shake their shoulders. If the person doesn’t respond, they are probably unconscious.
How can you tell whether someone is no longer breathing normally?
Turn the unconscious person onto their back. Place one of your hands under their chin and gently push their head back, to open their airway. Look at their chest to see whether it is rising and falling. Put your ear close to their mouth and nose, and see whether you can hear them breathing or feel their breath against your ear. If you can’t hear or feel their breath, and if their chest isn’t moving, then they aren’t breathing.
In the first few minutes after a person’s heart has stopped beating, they may still breathe a bit – but not in a normal way. Instead, their breathing may be
- very slow,
- very deep, or
- accompanied by a noise that sounds like snoring.
Whatever you do, don’t wait until the person has stopped breathing altogether. If, after 10 seconds, you still aren’t sure whether the unconscious person is breathing normally, you should call the emergency services and start CPR.
CPR – The first steps: a) Check consciousness, b) Check breathing, c) Dial 112 (or 911 in the U.S.)
What to remember when calling the emergency services
If someone else is with you and can help, ask them to call for an ambulance. Then you can immediately begin CPR.
If you are alone, dial 112 (or 911 in the U.S.) yourself. The emergency number 112 can be used free of charge throughout Europe, and can also be used in many countries outside of Europe. The person who answers the phone will ask you the following questions. Answer all of the questions as calmly and accurately as you can:
- Who is calling?
- What happened?
- Where did it happen?
- How many people are involved?
Do not hang up. Wait to see whether they ask any other questions or give you instructions. If your landline phone is within hearing distance, you have a cordless landline phone or are using a mobile phone, you can use the loudspeaker (“hands-free”) function and stay on the phone with the emergency services. The trained staff there can provide instructions and support over the phone.
How do you do chest compressions?
Kneel down next to the unconscious person. Place one hand on the center of their chest, with the heel of the hand on the lower half of the breastbone. Place your other hand on top, lacing your fingers together, and keeping your arms straight. Make sure that your hands don’t accidentally move to the side of the breastbone (towards the ribs) or that you don’t place them too low down (e.g. on the tip of the breastbone or on the belly).
Now push down on the person’s chest by moving your upper body downwards, keeping your arms straight. Then move your upper body back up, allowing the chest to rise again. Every time you do a chest compression, push the chest down by 5 to 6cm (about 2 inches). Repeat the compressions at a fast rate of about two compressions per second (100 to 120 compressions per minute). Make sure that your arms remain stretched (don’t bend at the elbows), or they will soon get tired.
The same is true if a child is unconscious and no longer breathing normally: Start helping immediately! Doing chest compressions in the same way as you would with an adult is better than doing nothing. To find out how to do CPR on children, visit the website of the American Red Cross.
Doing chest compressions is exhausting. It is therefore a good idea to take it in turns with someone else if possible, switching every two minutes.
How long should you keep going for?
The CPR can be stopped if
- the ambulance arrives and trained medical staff take over, or
- the person who you are helping shows signs of consciousness or starts breathing normally again. If they stay unconscious despite breathing normally, put them in the recovery position.
If you’re too exhausted to carry on doing chest compressions, that’s an acceptable reason to stop as well.
- Deutsches Rotes Kreuz (DRK). Der kleine Lebensretter. Notruf 112.
- Kragholm K, Wissenberg M, Mortensen RN, Hansen SM, Malta Hansen C, Thorsteinsson K et al. Bystander Efforts and 1-Year Outcomes in Out-of-Hospital Cardiac Arrest. N Engl J Med 2017; 376(18): 1737-1747. [PubMed]
- Perkins GD, Handley AJ, Koster RW, Castrén M, Smyth MA, Olasveengen T et al. European Resuscitation Council Guidelines for Resuscitation 2015: Section 2. Adult basic life support and automated external defibrillation. Resuscitation 2015; 95: 81-99. [PubMed]
- IQWiG health information is written with the aim of helping people understand the advantages and disadvantages of the main treatment options and health care services.
Because IQWiG is a German institute, some of the information provided here is specific to the German health care system. The suitability of any of the described options in an individual case can be determined by talking to a doctor. We do not offer individual consultations.
Our information is based on the results of good-quality studies. It is written by a team of health care professionals, scientists and editors, and reviewed by external experts. You can find a detailed description of how our health information is produced and updated in our methods.
© IQWiG (Institute for Quality and Efficiency in Health Care)
Bookshelf ID: NBK469741
Three Things You May Not Know About CPR
People who have cardiac arrests may benefit from CPR, yet many people who witness cardiac arrest do not perform CPR. Learn about CPR so you can be prepared.
Cardiac arrest is not the same as a heart attack. Someone whose heart has stopped beating is in cardiac arrest and needs CPR.
What is CPR, and when should I use it?
Cardiopulmonary resuscitation (CPR) is an emergency procedure that can help save a person’s life if their breathing or heart stops.
When a person’s heart stops beating, they are in cardiac arrest. During cardiac arrest, the heart cannot pump blood to the rest of the body, including the brain and lungs. Death can happen in minutes without treatment.1 CPR uses chest compressions to mimic how the heart pumps. These compressions help keep blood flowing throughout the body.
Cardiac arrest is not the same as a heart attack. A heart attack happens when blood flow to the heart is blocked. A person having a heart attack is still talking and breathing. This person does not need CPR—but they do need to get to the hospital right away. Heart attack increases the risk for going into cardiac arrest.1
Learn some surprising facts about CPR, cardiac arrest, and how you can be prepared to help save a life.
1. CPR Saves Lives.
Currently, about 9 in 10 people who have cardiac arrest outside the hospital die.2 But CPR can help improve those odds. If it is performed in the first few minutes of cardiac arrest, CPR can double or triple a person’s chance of survival.2
Certain people, including people in low-income, Black, and Hispanic neighborhoods, are less likely to receive CPR from bystanders than people in high-income white neighborhoods.3
Women may also be less likely to receive CPR if they experience cardiac arrest in a public place.4
How can I tell whether someone is in cardiac arrest?5
- The person is unresponsive, even if you shake or shout at them.
- The person isn’t breathing or is only gasping.
If you see someone in cardiac arrest, call 9-1-1 right away and then start CPR. Keep doing CPR until medical professionals arrive.
2. Cardiac Arrests Often Happen at Home.
About 350,000 cardiac arrests happen outside of hospitals each year—and about 7 in 10 of those happen at home.3 Unfortunately, about half of the people who experience cardiac arrests at home don’t get the help they need from bystanders before an ambulance arrives.4
If you see cardiac arrest happen (see sidebar), call 9-1-1 right away and then do CPR until medical professionals arrive. Keep reading to learn how to perform CPR.
3. You Don’t Need Formal Training to Perform CPR.
You don’t need a special certification or formal training to perform CPR, but you do need education. If cardiac arrest happens to someone near you, don’t be afraid—just be prepared! Follow these steps if you see someone in cardiac arrest:
- Call 9-1-1 right away. If another bystander is nearby, save time by asking that person to call 9-1-1 and look for an automated external defibrillatorexternal icon (AED) while you begin CPR. AEDs are portable machines that can electrically shock the heart and cause it to start beating again.
- Give CPR. Push down hard and fast in the center of the chest at a rate of 100 to 120 pushes a minute. Let the chest come back up to its normal position after each push. The American Heart Association (AHA) recommends timing your pushes to the beat of the song “Stayin’ Alive.” This method of CPR is called “hands-only” and does not involve breathing into the person’s mouth.
- Continue giving CPR until medical professionals arrive or until a person with formal CPR training can take over.
Hands – Only CPR
Be the difference for someone you love. In a cardiac arrest, every second counts. A cardiac arrest can happen anywhere, often while at home, at work or at play. And the victim could be someone you know and love. We believe anyone can learn the simple steps to save a life, and everyone should.
Every minute CPR is delayed, a victim’s chance of survival DECREASES BY 10%.
Immediate CPR from someone nearby can double—even triple—their chance of survival.
Remember these two steps if you see a teen or adult suddenly collapse
- CALL your local emergency response number
- PUSH hard and fast in the center of the chest
Watch Take 60 seconds and watch the Hands-Only CPR video. Then share it with family and friends. Together we can help save more lives.
Hands on only CPR woman
Hands on only CPR plus AED man