When an adult suddenly collapses, trained or untrained bystanders – that means a person near the victim – should:

1) Call 911
2) Push hard and fast in the center of the chest.

Studies of real emergencies that have occurred in homes, at work or in public locations, show that these two steps, called Hands-Only CPR, can be as effective as conventional CPR. Providing Hands-Only CPR to an adult who has collapsed from a sudden cardiac arrest can more than double that person’s chance of survival.

Hands only science.

The American Heart Association includes some of the world’s leading resuscitation scientists and medical professionals. Their continuous review of published research studies on CPR resulted in the following AHA Science Advisory, published in an April 2008 edition of the medical journal Circulation.

Hands-Only (Compression-Only) Cardiopulmonary Resuscitation: A Call to Action for Bystander Response to Adults Who Experience Out-of-Hospital Sudden Cardiac Arrest.

Hand Only PDA
http://circ.ahajournals.org/cgi/content/full/117/16/2162