American Heart Association

Separately, the American Heart Association has re-arranged the ABCs of cardiopulmonary resuscitation (CPR) from A-B-C (Airway-Breathing-Compressions) to C-A-B (Compressions-Airway-Breathing).

According to the AHA, the reason is because the earlier approach was causing significant delays in starting chest compressions, which are "essential for keeping oxygen-rich blood circulating through the body..

Source: http://www.huliq.com/3257/american-heart-association-american-red-cross-release-new-first-aid-cpr-guidelines