Pressing on chest in a hard , quick rhythm helps keep cardiac arrest victims alive . It ca n't nourish cells unless replaced by beating heart or chest compressions . In the last year , rescuers saved nearly a third of ` ` saveable '' cardiac arrest victims .
Pressing on chest in a hard , quick rhythm can keep cardiac arrest victims alive . Oxygen ca n't nourish cells unless circulated by beating heart or chest compressions . In Arizona last year , rescuers saved nearly a third of `` saveable '' cardiac arrest victims .