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Dynamic Course of Clinical State Transitions in Patients Undergoing Advanced Life Support after Out-of-Hospital
Gianfranco Sanson1, Vittorio Antonaglia1, Giovanni Buttignon2
1Clinical Department of Medical, Surgical and Health Sciences, University of Trieste, Trieste, Italy.
Prehospital Emergency Care
|September 11, 2023
Summary
Understanding cardiac arrest state transitions during advanced life support (ALS) is key. Most stable spontaneous circulation (s-ROSC) occurs within 30 minutes, with asystole indicating a high mortality risk.
Area of Science:
- Cardiology
- Emergency Medicine
- Clinical Analysis
Background:
- Out-of-hospital cardiac arrest (OHCA) studies typically focus on initial and final states.
- Limited research exists on the dynamic clinical state transitions during advanced life support (ALS).
Purpose of the Study:
- To describe and analyze the dynamics of clinical state transitions during ALS in OHCA patients.
- To identify patterns and probabilities of state changes during resuscitation efforts.
Main Methods:
- Retrospective analysis of 464 OHCA events.
- Continuous electrocardiographic and trans-thoracic impedance monitoring to record state changes and timings.
Main Results:
- Most successful returns of spontaneous circulation (s-ROSC) were achieved within 30 minutes.
- Asystole was the most persistent state, associated with a 70% mortality rate.
- Ventricular fibrillation/tachycardia (VF/VT) and pulseless electrical activity (PEA) frequently transitioned to asystole; patients achieving s-ROSC most often originated from a VF/VT state.
Conclusions:
- The presenting cardiac rhythm often persists throughout ALS.
- Asystole represents the most stable, and often terminal, state.
- Understanding these transition dynamics can inform tailored treatment strategies for OHCA patients.
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