Resuscitation and Cardiac Arrest
Resuscitation and cardiac arrest is the area of emergency medicine concerned with recognising sudden cessation of effective circulation and breathing and with the time-critical interventions that aim to restore them. It spans the continuum from lay rescuer and bystander basic life support, through advanced cardiac life support delivered by clinical teams, to the intensive post-resuscitation care of patients in whom spontaneous circulation has returned.
Definition
Resuscitation is the set of interventions used to maintain or restore oxygenated circulation when the heart and breathing have stopped; cardiac arrest is the abrupt loss of effective cardiac mechanical activity, confirmed by unresponsiveness, absent normal breathing, and no detectable pulse.
Scope
This area orients the reader to the chain of survival as an organising framework: early recognition and activation of emergency response, early high-quality cardiopulmonary resuscitation (CPR), rapid defibrillation, advanced interventions, and integrated post-cardiac-arrest care. It groups the methodological and clinical topics of resuscitation rather than offering treatment instructions.
Sub-topics
Key concepts
- Chain of survival
- Cardiopulmonary resuscitation (CPR)
- High-quality chest compressions
- Defibrillation and shockable rhythms
- Return of spontaneous circulation (ROSC)
- Out-of-hospital versus in-hospital cardiac arrest
- Post-cardiac-arrest syndrome
Mechanisms
When effective cardiac output ceases, tissue oxygen delivery stops and irreversible neuronal injury begins within minutes. CPR substitutes for spontaneous circulation: external chest compressions generate forward blood flow and, combined with ventilation, sustain a fraction of baseline cerebral and coronary perfusion until a definitive rhythm can be restored. For shockable rhythms, prompt defibrillation can reorganise chaotic electrical activity into a perfusing rhythm. The closed-chest compression technique described by Kouwenhoven and colleagues in 1960 established that circulation could be supported without thoracotomy, a foundation of modern resuscitation. Contemporary guidelines emphasise minimally interrupted, high-quality compressions and early defibrillation as the interventions most strongly linked to survival.
Clinical relevance
Cardiac arrest is among the most time-sensitive emergencies in medicine, and the area structures how clinicians, systems, and the public understand the sequence of recognition, CPR, defibrillation, and post-arrest care. These entries describe how resuscitation evidence and consensus guidelines are organised; they are educational references and not a substitute for trained, situation-specific clinical judgement or dosing decisions.
Epidemiology
Sudden cardiac arrest is a major cause of death worldwide, occurring both out of hospital and in hospital, with survival to hospital discharge that varies widely across systems and depends heavily on bystander response and time to defibrillation. International guideline syntheses summarise this variation and the system factors associated with better outcomes.
History
Modern resuscitation took shape in the mid-twentieth century. Kouwenhoven, Jude, and Knickerbocker's 1960 description of closed-chest cardiac massage, together with the development of mouth-to-mouth ventilation and external defibrillation, allowed CPR to be combined into a portable technique. Successive international consensus processes consolidated the evidence into the chain-of-survival framework and the periodically updated resuscitation guidelines issued by bodies such as the American Heart Association and the European Resuscitation Council.
Key figures
- William Kouwenhoven
- James Jude
- Guy Knickerbocker
- Peter Safar
- Jasmeet Soar
Related topics
Seminal works
- kouwenhoven-1960
- merchant-2020
- panchal-2020
Frequently asked questions
- What is the chain of survival?
- It is a framework describing the sequential actions most associated with survival from cardiac arrest: early recognition and activation of emergency services, early CPR, rapid defibrillation, advanced care, and integrated post-cardiac-arrest care.
- How do resuscitation and cardiac arrest relate to each other?
- Cardiac arrest is the event — the sudden loss of effective circulation — and resuscitation is the set of interventions used to try to reverse it and support the patient afterward.