When an adult has a sudden cardiac arrest, his or her survival depends greatly on immediately getting CPR from someone nearby. Unfortunately, less than 1/3 of those people who experience a cardiac arrest at home, work or in a public location get that help. Most bystanders are worried that they might do something wrong or make things worse. That’s why the AHA has simplified things.
Don’t be afraid. Your actions can only help.

It’s not normal to see an adult suddenly collapse, but if you do, call 911 and push hard and fast in the center of the chest. Don’t be afraid. Your actions can only help. Take a minute and look around this site and invite your friends! Increasing the number of people who know about Hands-OnlyTM CPR will increase the chance that someone can help when an adult suddenly collapses, and more lives can be saved.

Check out this video to see Hands-Only CPR in action.
Source: Hands Only CPR.org/