I have heard often enough growing up that cardiac arrest is dangerous. My family referred to it like a thief in the night. It stole my father's sister. It can just happen sometimes without even any warning. Quick and deadly. That is why people should know about heart problems like Cardiac Arrhythmia for their own protection. It always pays to know about the enemy to win the game. You have to win it because the stake is great, your life. Seek help. Know the difference. A smart person should know his options and use it to his advantage.