Clinical Context

• Population: Adult cardiac arrest patients (and selected pediatric cases in experienced centers)
• Setting: Primarily ED settings with established ECMO/eCPR programs
• Decision: Whether to activate eCPR versus continue conventional CPR

Best Evidence

Guidelines / consensus

• St Emlyn’s ILCOR update suggests eCPR may be considered as a rescue therapy in refractory OHCA when conventional CPR is failing—highlighting the need for careful patient selection ^1.
• PEM Cincinnati emphasizes that eCPR is reserved for patients where the potential benefits clearly outweigh the risks and the patient meets strict institutional criteria ^4.

Key Trials & Guidelines

• ARREST Trial: Demonstrated improved survival with eCPR in selected patients with witnessed, shockable arrests despite being resource intensive ^2.
• Prehospital Checklists (NAEMSP/Taming the SRU): Support using criteria (e.g., witnessed arrest, bystander CPR, age cutoffs, favorable baseline function, and a time window ~<30–60 minutes from collapse) to identify candidates for eCPR ^5^3.

Bedside Application

• Use if:
  • Arrest is witnessed, with immediate bystander and professional high-quality CPR.
  • The patient exhibits an initial shockable rhythm (or PEA with sufficient rate) and has a reversible etiology (e.g., myocardial infarction, pulmonary embolism, hypothermia).
  • No ROSC is achieved after an initial 15–30 minutes of conventional resuscitation.
  • The patient is relatively young (often <70 years; many programs use an 18–60 or 18–70 window) with good baseline functional status and without severe comorbidities.
  • Low-flow time from collapse to potential cannulation is within an acceptable timeframe (ideally <60 minutes) ^1^3.

• Avoid if:
  • Unwitnessed arrest or prolonged downtime leading to poor neurological prospects.
  • Significant pre-existing comorbid conditions or contraindications to anticoagulation.
  • In settings lacking the infrastructure for rapid ECMO initiation.

• Shared decision-making points:
  • Institutional resource allocation and ability to deliver rapid, high-quality eCPR in a coordinated fashion.
  • Discussion with multidisciplinary teams regarding inclusion criteria and expected benefits versus risks.

Controversies

• The evidence base remains low-to-moderate in certainty, and outcome benefits are highly dependent on system performance. Patient selection criteria may vary between centers, and “refractory” arrest definitions differ (15 vs. 30 minutes of CPR) ^1^3.

Practical Approach

1. Confirm that the arrest was witnessed, with immediate initiation of quality CPR (look for surrogate markers such as end-tidal CO2 >10 mmHg).
2. Evaluate rhythm and etiology—focus on initial shockable rhythms and potentially reversible causes.
3. Assess patient factors including age (often <70 years), baseline functional status, and absence of significant comorbidities.
4. Check time parameters: if no ROSC occurs after 15–30 minutes with ongoing high-quality CPR and expected cannulation within around 60 minutes, activate the eCPR protocol.
5. Ensure your hospital’s multidisciplinary ECMO team is prepared to act and that coordination with EMS (for prehospital alerts) is established.

^1 ^2 ^3 ^4 ^5