Ventricular Fibrillation Recurrences in Successfully Shocked Out-of-Hospital Cardiac Arrests

Area of Science:

• Cardiology
• Emergency Medicine
• Resuscitation Science

Background:

• The prognostic significance of ventricular fibrillation (VF) recurrences post-shock in out-of-hospital cardiac arrest (OOHCA) remains unclear.
• Concerns exist regarding chest compressions potentially inducing arrhythmias in this specific context.

Purpose of the Study:

• To investigate the short-term and long-term prognosis associated with VF recurrences in OOHCA survivors.
• To explore the potential association between VF recurrences and chest compression techniques.

Main Methods:

• Analysis of prospectively collected data from the Progetto Vita registry in Piacenza, Italy.
• Inclusion of 160 OOHCA cases with shockable rhythms, optimal ECG, and audio recordings.
• Assessment of survival to hospital admission, discharge, and long-term outcomes over 14 years, analyzing rhythms post-shock.

Main Results:

• Patients experiencing VF recurrence had significantly lower short- and long-term survival rates without neurological impairment (p < 0.001).
• VF recurrence was more frequent when chest compressions were resumed early and applied more vigorously post-shock.
• Mean patient age was 64.4 ± 16.9 years, with 31.9% females; mean EMS arrival time was 5.9 ± 4.5 minutes.

Conclusions:

• Ventricular fibrillation recurrences following defibrillation negatively impact both short- and long-term survival in OOHCA.
• The potential pro-arrhythmic effect of chest compressions warrants careful consideration regarding their timing and intensity in OOHCA management.