Synchronized Chest Compressions for Pseudo-PEA: Proof of Concept and a Synching Algorithm

Area of Science:

• Cardiology
• Critical Care Medicine
• Biomedical Engineering

Background:

• Pulseless electrical activity (PEA) cardiac arrest presents unique resuscitation challenges.
• Optimizing chest compressions during PEA is crucial for improving patient outcomes.
• Current cardiopulmonary resuscitation (CPR) guidelines lack specific recommendations for synchronizing compressions to residual cardiac activity.

Purpose of the Study:

• To compare the efficacy of synchronized versus unsynchronized chest compressions in a porcine model of hypotension.
• To develop and validate an algorithm for delivering synchronized chest compressions across a range of native heart rates encountered in PEA.
• To assess the feasibility of synchronized chest compression therapy for PEA.

Main Methods:

• A signal-guided CPR system was adapted to synchronize chest compressions to native electrical activity in a hypotensive porcine model.
• A proof-of-concept comparison of unsynchronized versus synchronized compressions was performed in a single animal.
• A novel algorithm was developed and tested via computer simulations to maintain synchronized compressions within a target rate (90-140 bpm) across varying intrinsic heart rates and jitter.

Main Results:

• Synchronized chest compressions, unlike unsynchronized ones, significantly increased blood pressure and coronary perfusion pressure in the porcine model.
• The developed algorithm achieved over 90% synchronization with intrinsic beats across most simulated heart rates.
• The algorithm maintained an average compression rate between 90-140 bpm with low variability, even with intrinsic heart rate fluctuations.

Conclusions:

• Synchronized chest compression therapy is a feasible approach for treating PEA cardiac arrest.
• High synchronization rates can be achieved and maintained over a wide spectrum of intrinsic heart rates.
• Further research is warranted to evaluate the clinical benefits of synchronized chest compressions in PEA patients.