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Contextualizing Pseudo-Pulseless Electrical Activity in Cardiac Arrest: A Meta-Analysis and Systematic Review.
Omar Elhalwagy1, Ben Singer2, Gareth Grier3
1School of Medicine, Barts and The London School of Medicine and Dentistry, London, United Kingdom; The Institute of Pre-Hospital Care, London's Air Ambulance, The Helipad, The Royal London Hospital, London, United Kingdom.
Air Medical Journal
|February 24, 2025
Summary
Pulseless electrical activity (PEA) has better survival rates than asystole, especially with pseudo-PEA. This finding suggests tailored management for PEA, potentially improving neurological outcomes in cardiac arrest patients.
Area of Science:
- Emergency Medicine
- Cardiology
- Critical Care Medicine
Background:
- Nonshockable cardiac arrest rhythms, including pulseless electrical activity (PEA) and asystole, are associated with poor patient outcomes.
- Pseudo-pulseless electrical activity (PEA), characterized by visible cardiac contractility without a palpable pulse, is increasingly recognized.
- Physiological principles suggest that cardiac motion in pseudo-PEA is more favorable than true PEA, resembling asystole.
Purpose of the Study:
- To investigate the hypothesis that pulseless electrical activity (PEA) demonstrates increased survivability compared to asystole.
- To explore whether pseudo-PEA contributes to improved outcomes in patients with PEA.
- To compare the neurological outcomes between PEA and asystole in cardiac arrest patients.
Main Methods:
- A systematic review and meta-analysis was conducted, adhering to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines.
- A PICOST research question guided the systematic literature search and data synthesis.
- Data from 12 studies encompassing 494,355 patients were analyzed.
Main Results:
- Meta-analyses revealed significantly increased survivability for PEA compared to asystole (OR 2.08).
- PEA demonstrated higher survivability than asystole in both out-of-hospital cardiac arrest (OR 4.17) and in-hospital cardiac arrest (OR 1.60) settings.
- Neurological outcomes were more favorable in patients with PEA compared to asystole (OR 3.32).
Conclusions:
- Pseudo-PEA may explain the better outcomes observed in PEA, potentially due to maintained cerebral and coronary blood flow.
- The presence of PEA warrants tailored, evidence-based management strategies, with pseudo-PEA possibly indicating a profound shock state.
- Further research is needed to determine the precise incidence of pseudo-PEA and its comparative outcomes against true PEA.
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