What causes a cardiac arrest? A common cause of a cardiac arrest is a life-threatening abnormal heart rhythm called ventricular fibrillation (VF). VF happens when the electrical activity of the heart becomes so chaotic that the heart stops pumping, Instead, it quivers or ‘fibrillates’. The main causes of cardiac arrest related to the heart are:
https://www.bhf.org.uk/informationsupport/conditions/cardiac-arrest

