Death due to sudden cardiac arrest (SCA) is a big problem. Typically related to heart disease, SCA affects nearly 300,000 Americans each year. As its name suggests, these events occur quickly, and in most cases, without warning. They can occur at any time and in any place.
If one occurs in front of you, you are the only solution. There are only a few minutes between the time SCA occurs and when treatment becomes useless. A bystander has the best and maybe the only chance to help.