Information on this condition are everywhere on the web. But in far too many cases people simply don't pay attention thinking it will never happen to them.
Not all heart attacks are the same. Heart blockages can occur when cholesterol may conjoin with elevated blood sugar to block a pathway in your heart. For that condition doctors typically prescribe statin drugs to lower risk of blockage.
Sudden Cardiac Arrest or SCA is quite different, the electrical connections that run your heart cease to function. Both blockages and SCA can have similar impacts, you can become disabled and eventually die. In both conditions there may be early warning signs. In the case of SCA there are generally four signs explained in detail from a current National Institutes of Health website:
"Usually, the first sign of sudden cardiac arrest (SCA) is loss of consciousness (fainting). At the same time, no heartbeat (or pulse) can be felt.
Some people may have a racing heartbeat or feel dizzy or light-headed just before they faint. Within an hour before SCA, some people have chest pain, shortness of breath, nausea (feeling sick to the stomach), or vomiting."
Read more at http://www.nhlbi.nih.gov/health/health-topics/topics/scda/prevention