According to two studies, more bystanders are offering CPR to people who suffer from heart attack when they are away from hospital and bystander in addition to first responder CPR helps achieve better outcomes for the patients suffering from the condition.

The study was conducted in North Carolina and Japan. As per reports, the study was conducted on 11 counties of North Carolina, where approximately 30% of the state’s population lives.

According to an editorial, the benefits that have been explained in the North Carolina study could be overemphasized for the reason that the study doesn’t consider 51 counties that didn’t have complete case capture in addition to 38 counties that have no role in the CARES registry. The registry was established by CDC and Emory University in 2004 to assist in increasing out-of-hospital heart attack survival.

This North Carolina study was conducted on 4,961 individual patients in 11 counties that had put into practice "multifaceted interventions" so as to increase bystander and first responder CPR interventions. As per the editorial, it was found in the study that survival with favorable neurologic outcomes increased from 7.1% in 2010 to 9.7% in 2013. It also said that bystander and first responder CPR interventions were linked to more survival and also hospital discharge.

According to Dr. Carolina Malta Hansen of the Duke Clinical Research Institute in Durham, N.C., "In terms of outcomes, we saw survival with good brain function increase by 37 percent, which is a very remarkable result".