“Sudden Cardiac Arrest (SCA) is not a heart attack. A heart attack is caused by impeded blood flow through the heart. SCA is caused by a structural or electrical problem, often from an undetected heart condition, and in other instances, from an infection or a severe blow to the chest. One is a electrical problem (cardiac arrest) where the other is a plumbing problem (heart attack).”
stopcardiacarrest.org