What risk factors predispose a patient to sudden cardiac arrest?

All of the above answers are correct., but also blunt force trauma to chest can cause tamponade and arrest of heart. Happened to a hockey player of the St. Louis Blues named Chris Pronger who was hit in the right spot of of the chest between the padding and he arrested on ice, Medics got him back. Could also be a sudden arrhythmia that can do it as well, common in potium imbalances