Heart attack and cardiac arrest are the same. A heart attack is caused by blockage in an artery supplying blood to the heart.
Cardiac arrest happens when the electrical impulses change and the heart beats abnormally fast.
There are two types of arrhythmia, benign and life-threatening. The first is life-altering and can be controlled with medication or ablation. More serious are life-threatening rhythms. These occur in people who have a history of heart attack or heart conditions. Eighty percent of those who suffer from cardiac arrest don't make it.