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Posted by By Shira A. Schlesinger , MD, MPH, Harbor-UCLA Medical Center Last full review/revision Jul 2021| Content last modified Jul 2021 on Sep 14th 2021

Cardiac Arrest and CPR

Cardiac Arrest and CPR

Cardiac arrest is when the heart stops pumping blood and oxygen to the brain and other organs and tissues. Sometimes a person can be revived after cardiac arrest, particularly if treatment is started immediately. However, the more time that passes without oxygen-containing blood being pumped to the brain, the less likely it is that the person can be revived, and, if revived, the more likely it is that the person will have brain damage.

abnormal heart rhythm (arrhythmia). Another possible cause is stopping breathing, such as when a person drowns or has a severe lung infection or severe asthma attack.

chain of survival. The survival chain begins with bystander recognition of cardiac arrest and continues through calling for emergency services, providing cardiopulmonary resuscitation (CPR) and defibrillation when available, and giving high-quality post-arrest care in a hospital. Without successful accomplishment of each of these steps, it is unlikely that a person will survive.

compression-only CPR.

An AED can rapidly determine whether the person has an abnormal heart rhythm that can be treated by an electric shock (called defibrillation). If the AED detects an abnormal rhythm that could be corrected, it delivers a shock, which may start the heart beating again. AEDs are easy to use and are available in many public gathering places. Written instructions for use are available on each AED and should be followed. Most modern AEDs also provide voice prompts on how to use the AED. The American Red Cross, American Heart Association, and several other organizations provide training on CPR and the use of AEDs.

Out-of-Hospital Chain of Survival

The crucial links in the chain of survival include
  • Early access to emergency care: The earlier a bystander recognizes that cardiac arrest has occurred, the sooner someone can call emergency medical services, and the sooner personnel will arrive on site to deliver advanced care.
  • Early cardiopulmonary resuscitation (CPR): The sooner the rescuer starts CPR (particularly chest compressions), the greater the chance the brain and other vital organs will receive enough oxygen to keep the person alive until an automatic external defibrillator (AED) can be used or more advanced medical care provided.
  • Early defibrillation: Sometimes an electrical shock, called defibrillation, needs to be given to restore the heart's normal rhythm. The sooner this is done, the better.
  • Early provision of advanced medical care: The sooner emergency medical services (EMS) personnel can take over what the rescuer started, the sooner the person can benefit from advanced medical care.

People who are resuscitated need advanced monitoring and treatment and eventually rehabilitation and other measures to improve recovery.

Automated External Defibrillator: Jump-Starting the Heart

ventricular fibrillationand ventricular tachycardia. These abnormal heart rhythms frequently are the cause of cardiac arrest. As soon as cardiac arrest is recognized, cardiopulmonary resuscitation (CPR) should be started. An AED should be used as soon as it is available while another bystander activates the emergency response system. If the AED detects an abnormal heart rhythm, it provides an electrical shock (defibrillation) that can restore normal heart rhythm and start the heart beating again. Emergency medical care should be obtained even if the heart has started beating again. CPR should be continued immediately after a shock is delivered and continued until the person starts to breathe normally and/or move, or until emergency medical services (EMS) providers arrive on the scene and take over care. The AED will continue to analyze the person's heart rhythm every 2 minutes and will provide additional shocks if indicated.AEDs are easy to use. The American Red Cross and other organizations provide training sessions on the use of AEDs. Most training sessions take only a few hours; but it is possible to use an AED even if you have never participated in a training course. Different AEDs have somewhat different instructions for use. The instructions are written on the AED, and most modern AEDs also use voice prompts to direct the user in each step. AEDs are available in many public gathering places, such as stadiums, airports, and concert halls. People who are told by their doctor that they are likely to develop ventricular fibrillation but who do not have an implanted defibrillator may want to purchase an AED for home use by family members, who should be trained in its use.

Skill in CPR is best obtained through a training course, such as one offered by the American Red Cross or the American Heart Association. (Training courses can be found through the web sites of the American Red Crossor the American Heart Association.)In addition, taking periodic refresher courses can help because procedures may change over time.

There are two CPR methods:

  • Standard CPR (done by rescuers trained to provide chest compressions and rescue breaths)
  • Compressions-only (done by rescuers untrained in—or reluctant to do—rescue breaths)

Studies have shown that compressions-only CPR is as effective as standard CPR for adolescents and adults in the first few minutes of cardiac arrest. Standard CPR may be more effective for children and infants, and for people whose cardiac arrest is due to respiratory causes, but only if the rescuer has been trained.

CPR: How Effective Is It Really?

CPR: How Effective Is It Really?

On television and in the movies, people who collapse due to cardiac arrest and receive cardiopulmonary resuscitation (CPR) often awaken during, or after, CPR is done.

In real life, it is much less likely that people will be revived by CPR itself. Instead, CPR is done to circulate oxygen-containing blood from the lungs to the brain and organs until the heart can be restarted with a defibrillator, often with the help of special drugs given by emergency medical services personnel.

Only a small percentage of people who suffer cardiac arrest will survive until they reach a hospital. Even those who reach the hospital alive often die as a result of the underlying heart problem before they can be discharged. Of those people who are able to leave the hospital, many will not regain their normal mental function. The most important factors that influence whether a person will survive cardiac arrest and return to normal life after hospital discharge are early initiation of CPR and early defibrillation.

Usually in television or film, CPR is done on a young, relatively healthy person, sometimes someone who has suffered a serious injury. In reality, most people who need CPR are older adults who often have many serious underlying illnesses. These people are much less likely to have a good outcome after CPR. Also, CPR is rarely effective if the cause of cardiac arrest is a traumatic injury.

In television and film, the person either dies or recovers fully. In reality, many people who survive cardiac arrest have serious disabilities as a result of the lack of blood flow to the brain.

Standard CPR

Standard CPR combines rescue breathing (mouth-to-mouth resuscitation to supply oxygen to the lungs) with chest compressions that force oxygen-containing blood out of the heart to the brain and other vital organs.

The sequence of CPR begins with 30 chest compressions, followed by 2 rescue breaths, and continues in a ratio of 30:2 until the rescuer is relieved by emergency personnel. Chest compressions can quickly tire a person, resulting in compressions that are too weak to circulate blood effectively. Thus, if two or more rescuers are present, they should switch every 2 minutes, or sooner if the rescuer performing compressions begins to feel tired.

To do chest compressions in an adult or child, the rescuer lays the person face up, rolling the head, body, and limbs at the same time. The rescuer extends his or her arms and "locks" them straight at the elbows, leans over the person, and places both hands, one on top of the other, in the center of the chest (between the nipples on the breastbone). The rescuer then compresses the chest to a depth of at least 2 inches (5 centimeters) in adults. In children, the rescuer compresses the chest about 2 inches (5 centimeters), and may need to use only one hand to compress in a smaller child. For an infant (up to 1 year old), the rescuer may use two fingers to compress the infant's breastbone just below the nipples to a depth of about 1½ inches (about 4 centimeters) or ⅓ the diameter of the chest. Alternatively, trained rescuers may choose to encircle the infant's chest with two hands and do compressions with their thumbs.

Opening an Airway in an Adult or Child

After doing 30 compressions, the rescuer tilts the person's head back slightly and lifts the chin, which moves the tongue away from blocking the airway. The rescuer then pinches the person's nose shut, takes a normal breath, seals the mouth over the person's mouth, and blows into the person's mouth for long enough to make the person's chest just rise (about 1 second). This is repeated a second time, followed immediately by another 30 compressions.

To do rescue breaths, the rescuer first looks in the mouth and throat for any visible objects that may be blocking the airway and, if any are present, removes them. The rescuer then opens the airway by tilting the person's head and lifting the chin (see figure Opening an Airway in an Adult). The rescuer's mouth covers the person's mouth and then the rescuer exhales air into the person's lungs (rescue breaths). The person's airway must remain open during artificial respiration. To prevent air from escaping from the person's nose, the person's nose can be pinched shut as the rescuer exhales into the mouth. Artificial respiration is very similar in children and adults.

For artificial respiration on an infant, the rescuer's mouth covers the infant's mouth and nose. To prevent damaging the infant's smaller lungs, the rescuer exhales with less force than with adults. If the chest rises, the rescuer should give two deep, slow breaths. Failure of the chest to rise after properly delivering rescue breaths indicates that the infant's airway is blocked, but CPR should continue. Each time the airway is opened during CPR, the rescuer should look for an object in the infant’s mouth and, if one is found, remove it.

Standard CPR can be done by one person (a single person alternately does rescue breaths and chest compressions) or by two people (one to do rescue breaths and one to do chest compressions). In standard CPR, a single rescuer gives 30 compressions and then two breaths. If two rescuers are present, when children or infants need CPR, a ratio of 15:2 is preferred, whereas in newborns, a rate of 3:1 is recommended. Compressions are done at a rate of 100 to 120 times per minute in people of all ages. CPR is continued until medical assistance arrives or the person recovers.

Compression-only CPR

Compression-only (sometimes called hands-only) CPR involves giving continuous chest compressions without rescue breathing. Compression-only CPR is recommended when the rescuer does not have training in standard CPR or is unable or unwilling to do rescue breathing. For infants, children, and people in whom the cause of cardiac arrest seems to be from stopping breathing, such as those who have drowned, standard CPR with rescue breaths is preferred. However, if rescuers are unwilling or unable to do artificial respiration, they should still do compression-only CPR even on people who are thought to have cardiac arrest due to a problem with breathing.

Doing Chest Compressions in an Adult

To do chest compressions for cardiopulmonary resuscitation (CPR), a rescuer kneels to one side and, with the arms held straight, leans over the person and places both hands, one on top of the other, just above (about two finger widths) the lowest part of the breastbone (called the xiphoid process). The rescuer compresses the chest to at least 2 inches (5 centimeters) in adults. The chest is compressed about 100 to 120 times per minute, allowing it to fully rise back up to its starting height, between each compression.

More Information

American Heart Association, Cardiopulmonary Resuscitation (CPR) & First Aid Emergency Cardiovascular Care (ECC):This resource offers access to CPR courses and training programs, kits with useful teaching aids (including practice dummies), and information on resuscitation science.

  • American Red Cross, Cardiopulmonary Resuscitation (CPR) Training:This resource offers access to online CPR training and certification courses in adult CPR, hands-only CPR, child and baby CPR, and pet CPR; supplies and products; and a locator for finding online and live training sessions.