ICU · resuscitation
Post-Cardiac Arrest Syndrome (PCAS) — Comprehensive ICU Management
Also known as Post-cardiac arrest syndrome · PCAS · Post-ROSC syndrome · Post-arrest brain injury · Post-arrest myocardial dysfunction · Post-resuscitation care · Post-arrest care bundle · Post-arrest multi-organ failure
Post-cardiac arrest syndrome (PCAS) — the multi-system injury following return of spontaneous circulation (ROSC), comprising four interconnected components (Nolan 2008 ILCOR/AHA scientific statement; ERC/ESICM 2021 post-resuscitation care guidelines): (1) post-arrest brain injury — about two-thirds of in-hospital deaths in patients admitted comatose to ICU after OHCA are caused by hypoxic-ischaemic brain injury; seizures are reported in 20-30%; (2) post-arrest myocardial dysfunction — common, typically starts to recover by 2-3 days, full recovery may take longer; (3) systemic ischaemia/reperfusion response — systemic immune and coagulation activation with a sepsis-like vasoplegic shock state; (4) persistent precipitating pathology — emergent cardiac catheterisation laboratory evaluation (and immediate PCI if required) for suspected cardiac origin with ST-elevation; without ST-elevation, consider emergent angiography if high probability of acute coronary occlusion. ICU bundle (ERC/ESICM 2021): targeted temperature management 32-36 C for at least 24 hours with fever avoidance (over 37.7 C) for at least 72 hours; avoid hypotension (MAP under 65 mmHg); titrate oxygen to SpO2 94-98% (PaO2 75-100 mmHg); normocapnia 35-45 mmHg; lung-protective ventilation 6-8 mL/kg ideal body weight; levetiracetam or sodium valproate first-line for seizures (no routine prophylaxis); blood glucose 7.8-10 mmol/L; multimodal prognostication at 72 hours or later after confounders excluded.
Checked against its sources on 3 Sept 2026
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- Hypotension (MAP <65 mmHg) after ROSC is consistently associated with poor outcome — avoid hypotension; maintain perfusion with fluids, noradrenaline and/or dobutamine, targeting adequate urine output and normal or decreasing lactate (ERC/ESICM 2021)
- Hyperoxaemia must be avoided — titrate FiO2 to SpO2 94-98% (PaO2 75-100 mmHg) once measurable; PaO2 ≥300 mmHg on the first ICU blood gas was associated with 63% in-hospital mortality vs 45% in normoxia (Kilgannon, JAMA 2010)
- Seizures occur in 20-30% of post-arrest ICU patients and are often purely electrographic — use EEG to diagnose electrographic seizures; treat with levetiracetam or sodium valproate plus sedatives; do NOT use routine seizure prophylaxis (ERC/ESICM 2021)
- Post-arrest myocardial dysfunction is common but typically starts to recover by 2-3 days — do not make irreversible decisions on day 1; consider LVAD or VA-ECMO in haemodynamically unstable patients with ACS and recurrent VT/VF despite optimal therapy (ERC/ESICM 2021 also lists IABP for persisting cardiogenic shock)
- Emergent cardiac catheterisation laboratory evaluation (and immediate PCI if required) for arrest of suspected cardiac origin WITH ST-elevation; without ST-elevation, consider it if high probability of acute coronary occlusion (haemodynamic or electrical instability). In comatose OHCA without STEMI, COACT found no 90-day survival benefit of immediate vs delayed angiography (64.5% vs 67.2%)
- Do NOT prognosticate early — final prognostication only after rewarming, with sedation stopped for at least 24 h, and clinical examination at 72 h or later from ROSC; no single test is sufficient — use at least two predictors (ERC/ESICM 2021)
- Fever after ROSC must be prevented and treated — avoid temperature over 37.7 C for at least 72 hours after ROSC in patients who remain comatose (ERC/ESICM 2021)
Overview
PCAS is not a single disease — it is a syndrome of interconnected injuries that feed back on each other: brain injury causes catecholamine surge → myocardial stress → arrhythmia → re-arrest; myocardial dysfunction → hypotension → cerebral hypoperfusion → worsened brain injury; systemic inflammation → vasoplegia → hypotension → worsened brain injury. The intensivist must manage ALL four components simultaneously — focusing on only one (e.g., TTM alone) misses the systemic nature of the injury. Hypoxic-ischaemic brain injury is itself associated with hypotension, hypoxaemia, hyperoxaemia, pyrexia, hypoglycaemia, hyperglycaemia and seizures — every one of these is a secondary insult you control.[1][2]
References14ShowHide
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