Cardiopulmonary Resuscitation
Cardiopulmonary resuscitation (CPR) is the body of emergency interventions used to sustain artificial circulation and oxygenation when the heart has stopped pumping effectively, and to restore a spontaneous perfusing rhythm. As a reference area it spans the recognition of cardiac arrest, the delivery of chest compressions and ventilation, electrical therapy, and the drugs used during resuscitation, organized around the concept of the chain of survival.
Definition
Cardiopulmonary resuscitation is the coordinated set of techniques — chest compressions, assisted ventilation, defibrillation, and resuscitation pharmacotherapy — applied to a person in cardiac arrest to maintain perfusion of vital organs and to achieve return of spontaneous circulation.
Scope
This area orients the reader to the core components of resuscitation from cardiac arrest: how arrest is recognized and its rhythms classified, how chest compressions and ventilation generate flow and gas exchange, how defibrillation and other electrical therapies are used, and the pharmacotherapy given during an arrest. It is descriptive and educational, situating each topic within basic and advanced life support, and does not provide step-by-step performance instructions or replace certified training.
Sub-topics
Key concepts
- Chain of survival
- Cardiac arrest and return of spontaneous circulation (ROSC)
- Basic life support and advanced life support
- Shockable versus non-shockable rhythms
- High-quality chest compressions
- Defibrillation and electrical therapy
- Resuscitation pharmacotherapy
Mechanisms
Effective resuscitation links several mechanisms in sequence. Chest compressions generate forward blood flow by raising intrathoracic pressure and directly compressing the heart, sustaining cerebral and coronary perfusion until a perfusing rhythm returns. Ventilation restores oxygenation and removes carbon dioxide. When the underlying rhythm is shockable, defibrillation terminates the disorganized electrical activity so that an organized rhythm can resume. Drugs given during the arrest aim to support perfusion pressure and rhythm stability. International guidelines emphasize that high-quality, minimally interrupted compressions and early defibrillation carry much of the survival benefit, with other measures layered on top.
Clinical relevance
This area underpins basic and advanced life support training and is a major focus of public education, because early bystander CPR and prompt defibrillation are consistently associated with better survival from out-of-hospital cardiac arrest. The entry describes the principles for reference; actual technique, sequence, and decision-making follow current resuscitation guidelines and formal training rather than this summary.
Epidemiology
Out-of-hospital cardiac arrest affects a large number of people each year, and survival depends heavily on the early links of the chain of survival. Population-based studies have shown that arrests in which bystander CPR is performed before emergency services arrive are associated with substantially higher survival than those without it.
Evidence & guidelines
The reference standards for this area are the periodic international consensus statements and the guidelines of the American Heart Association and the European Resuscitation Council, which synthesize the evidence on compressions, ventilation, defibrillation, and drugs into staged recommendations and are updated as new trial evidence accumulates.
History
Modern CPR emerged in the mid-twentieth century when closed-chest compression was combined with expired-air ventilation and external defibrillation into a unified resuscitation sequence. The approach has since been refined through successive international consensus statements and the periodic guidelines of the major resuscitation councils, which progressively emphasized compression quality, early defibrillation, and the integrated chain of survival.
Related topics
Seminal works
- panchal-2020
- soar-2021
- hasselqvist-ax-2015
Frequently asked questions
- What does the cardiopulmonary resuscitation area cover?
- It orients the reader to the main components of resuscitation from cardiac arrest — recognizing arrest and its rhythms, chest compressions and ventilation, defibrillation and electrical therapy, and resuscitation drugs — and links them through the chain of survival.
- Why are the early links of the chain of survival emphasized?
- Survival from out-of-hospital cardiac arrest falls rapidly with each minute of delay, so early recognition, prompt bystander CPR, and early defibrillation are consistently linked to the largest survival gains.