Do you know what the symptoms are and what to do when someone we know suffers from sudden cardiac arrest ? It is a common misconception that cardiac arrest and heart attacks are different terms for the same medical condition. However, the cause behind each is different. Iâ€™ve always thought cardiac arrest meant the heart stopped. But after watching the short video on the Inside Cardiac Arrest website I learned that sudden cardiac arrest actually happens when the heart starts beating irregularly. Sudden Cardiac Arrest (SCA) is characterised by an Irregular Heartbeat while â€œheart attackâ€ is the common term for a myocardial infarction, or death of the cardiac muscle resulting from blockages of the blood vessels. This site provides information to people about the human heart and about how cardiac arrest effects the heart. People who have had or who have had a family member who has suffered from cardiac arrest should visit this site and find out about ICD Implant.