Unit
- Chain of Survival: A sequence of actions that maximize survival from cardiac arrest. It includes early recognition and call for help, immediate high-quality CPR, rapid defibrillation, advanced life support, and post-resuscitation care. Each link relies on the previous link for effectiveness.
- Early Recognition: The first link involves identifying that a person is unresponsive and not breathing normally. Bystanders must recognize agonal gasps as a sign of cardiac arrest, not effective breathing. This recognition triggers the emergency response system.
- Early CPR: Chest compressions maintain blood flow to vital organs until defibrillation or advanced care arrives. Bystander CPR doubles or triples survival odds. The emphasis is on compression depth and rate, minimizing interruptions.
- Rapid Defibrillation: An AED delivers a shock to restore a viable heart rhythm. For every minute defibrillation is delayed, survival decreases by 7-10%. Public access AED programs significantly improve outcomes.
- Advanced Life Support: Professional responders provide advanced airway management, intravenous medications, and rhythm analysis. This link requires trained personnel and equipment. Integration with bystander actions is critical.
- Post-Resuscitation Care: After return of spontaneous circulation, targeted temperature management and optimizing organ function improve neurological outcomes. This link involves hospital-based interventions.
- Integration of Links: The chain is only as strong as its weakest link. Training programs and community response systems aim to strengthen each step. Public education on the chain increases overall survival.
- Role of CPR Assistant: In the chain, the CPR assistant typically executes the first two links: recognition and CPR. Understanding the full sequence helps the assistant appreciate their pivotal role and transition smoothly when professional help arrives.
- High-Quality CPR Technique: Effective chest compressions require a depth of at least 2 inches (5 cm) and a rate of 100 to 120 compressions per minute. Allowing full chest recoil after each compression is critical for heart refilling. Minimizing interruptions in compressions, ideally to less than 10 seconds, helps maintain blood flow during the critical early minutes.
- Hands Only CPR for Bystanders: For untrained bystanders or those unwilling to give rescue breaths, hands only CPR with continuous chest compressions is recommended. It simplifies the process and increases the likelihood of bystander action. Studies show comparable outcomes to conventional CPR for adult cardiac arrests of presumed cardiac origin, especially before advanced care arrives.
- Team Coordination and Communication: In a multi responder scenario, the CPR assistant must communicate clearly with other bystanders and emergency dispatchers. Designating one person to call 911, another to retrieve the AED, and another to start compressions ensures efficient use of time. Clear handover of roles when professional responders arrive maintains continuity of care.
Scope of Practice
Role: CPR Assistant (layperson or non-clinical staff)
Within scope:
- Recognizing cardiac arrest using unresponsiveness and abnormal breathing checks.
- Calling emergency services and activating the emergency response system.
- Providing high-quality chest compressions at 100-120 per minute.
- Using a public access AED when available and instructed.
- Performing rescue breaths if trained and willing.
Outside scope:
- Diagnosing the cause of cardiac arrest (e.g., heart attack vs. other).
- Administering medications or intravenous fluids.
- Making decisions to cease resuscitation without professional guidance.
- Performing advanced airway procedures (e.g., intubation).
- Interpreting cardiac rhythms beyond AED prompts.
Quick Revision
- The Chain of Survival comprises five links: early recognition, early CPR, rapid defibrillation, advanced life support, and post-resuscitation care.
- Bystander CPR and prompt defibrillation are the most impactful actions before professional help arrives.
- The CPR assistant's scope includes calling for help, performing compressions, and using an AED.
- Understanding the entire chain helps the assistant coordinate with later responders.