If no bystander CPR is provided, a victim’s chance of survival is reduced by 7-10% with every minute of delay until defibrillation. *

When bystanders provided immediate CPR and defibrillation within 3-5 minutes to individuals who experienced sudden cardiac arrest due to ventricular fibrillation, the reported survival rates are as high as 48-74 percent. *

*Information from Statistical Fact Sheet on American Heart Association web site. www.heart.org