“Heart attack and sudden cardiac arrest are both serious medical emergencies, but they are not the same thing. A heart attack happens when blood flow to the heart is blocked. A cardiac arrest occurs when the heart suddenly stops beating. The only way to save a person’s life in cardiac arrest is to restart the heart using CPR and an AED.”

American Heart Association (https://www.heart.org/en/health-topics/house-calls/differences-between-heart-attack-and-cardiac-arrest)