Odds for return of a stopped heart to normal function is abyss able. Yearly approx. 525,000 cardiac arrests occur with nine of 10 happening outside of hospitals. research has shown 3-4 fold survival if quick action and teamwork comes into play. A heart has stopped and unless something is attempted the person will remain dead. The AHA has updated the 2010 guidelines for resuscitation to emphasize action for lay persons – bystanders no matter their training. Even if you have not taken a ‘CPR’ course there is evidence that your try can result in improvement outcome. The 2015 update emphasizes the importance of the chain of survival starting with you the bystanders. If you have help call 911, place the dispatcher on speaker and you will be directed the actions for chest compression. 
Yes it is best to take a 2 hour program and practice on mannequin. Online programs and on site are offered by organizations like AHA and ARC. That said placing your hands in the middle of a person’s chest locking your elbows and pressing fast (100-120 per minute) pressing about 2″ the chest CAN make a difference in outcome.
Mobile dispatch systems that notify potential rescuers of a nearby presumed cardiac arrest can improve the rate of bystander CPR and shorten the time to first chest compressions. Communities may want to consider this service to improve the chain of survival.
Have a listen to my podcast podcast- ‘Hands Only Chest Compressions’ for more details.
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