The peri-arrest period refers to the critical window of time immediately surrounding a full cardiac arrest: the period just before arrest (when a patient’s condition is deteriorating towards it) and the period just after successful resuscitation (when the patient remains highly unstable and at risk of re-arrest). In both cases the patient’s physiological state is precarious, and medical teams apply intensive monitoring and intervention to prevent further deterioration.
Pre-arrest recognition is a key focus of in-hospital cardiac care. Patients often show warning signs hours before a cardiac arrest: rising respiratory rate, falling blood pressure, declining consciousness, and new arrhythmias. National Early Warning Score (NEWS2) systems are used in NHS hospitals to identify these warning signs and trigger an escalation response. The goal of peri-arrest care before arrest is to intervene promptly enough to prevent cardiac arrest from occurring at all.
In the post-arrest peri-arrest period, the patient has been resuscitated but remains at high risk of re-arrest due to myocardial dysfunction, haemodynamic instability, ongoing arrhythmia, and the underlying cause that triggered the arrest. Vasopressors, antiarrhythmics, and early coronary angiography (if a coronary cause is suspected) are all part of immediate post-arrest management. The transition from resuscitation to intensive care management during this phase is an organised team effort coordinated by the cardiac arrest and critical care teams.
The peri-arrest concept underlies the importance of rapid response systems and early escalation in hospital settings, and of the 4Hs and 4Ts framework (Hypoxia, Hypovolaemia, Hypo/Hyperkalaemia, Hypothermia; Tamponade, Tension pneumothorax, Thrombosis, Toxins) for identifying and treating reversible causes of cardiac arrest both before and immediately after the event itself.
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