When paramedics reach a victim in cardiac arrest, instead of giving those artificial breaths, the paramedics immediately give the patient 200 quick chest compressions. 
    They then shock the heart with an electrical defibrillator.  The method works because it keeps the heart pumping blood throughout the body, particularly to the brain, which is critical for patient survival.   
    The American Heart Association says it needs to see more research before it changes official guidelines for treating patients.