Chain of Survival

The ‘Chain of Survival’, an internationally recognised concept, summarises the important components of successful resuscitation. This is achieved by development, implementation and standardisation of national guidelines and treatment protocols. The links in the chain need to be strengthened by research, community programmes and raising awareness. This will automatically improve the survival to discharge. [5,6]

There are several factors prior, during and post cardiac arrest which can influence the outcome of cardiac arrest. The prognostication strategy follows some key principles; Early communication, Delay timing of prognostication, Multimodal evaluation and Being patient.

The first three links in the chain are widely agreed and is well covered in national and international guidelines. The emergency physician is one of the initial points of contact, who is responsible for effective resuscitation and visits factors like co-morbidities, arrest events or do not resuscitate orders. This has direct influence on the decision such as continuation of resuscitation, likelihood of survival with good neurological outcome and it lays the platform for the equally vital post-resuscitation care. The final link of post-resuscitation care and its components, which offer the best probability of survival, is highly influenced by the hospital where a person is taken, cardiac interventional procedures, the indications and aims of various medical interventions in the intensive care unit, the indications for implantable defibrillators or cardiac resynchronisation devices, and optimal arrangements for cardiac and neurological rehabilitation. [5,6]

2025 resuscitation guidance positions the Chain of Survival within a broader, systems-based survival ecosystem. It is presented as part of a comprehensive public health strategy that emphasises system performance, community readiness, policy support and lifelong survivorship. [7]