Inclusion Criteria:  Age < 60 years witnessed sudden cardiac arrest with immediate CPR supposed cardiac cause of the event ventricular fibrillation (VF) or pulseless ventricular tachycardia (VT) at first medical contact with 3 unsuccessful defibrillations (no ROSC) CPR conducted with Lund University Cardiopulmonary Assist System (LUCAS™) Estimated transfer time from the scene to the Emergency Department < 30 minutes. End tidal carbon dioxide (ETCO2) > 10 mmHg  Exclusion Criteria:  Total presumed time from 112 call to ECMO implantation longer than 60 minutes Age < 18 years old or > 60 years old; Non-shockable initial rhythm Unavailability of the automated CPR device Unavailability of the catheterisation laboratory Severe concomitant illness with decreased life expectancy Severe body injury Severe active bleeding Drowning Terminal cancer