North Carolina trial finds no significant survival benefit
A wide-ranging program designed to improve early responses to out-of-hospital cardiac arrest did not significantly increase the proportion of patients who survived with favorable brain function, according to preliminary research presented at the American Heart Association’s Scientific Sessions in Chicago.
The RACE-CARS trial examined whether a coordinated combination of community education and emergency medical services changes could improve outcomes across North Carolina counties. Its goal was to strengthen the chain of actions that must happen quickly when a person’s heart stops outside a hospital: recognizing the emergency, calling 911, starting cardiopulmonary resuscitation, and using an automated external defibrillator when available.
Researchers randomly assigned 60 counties either to receive the intervention or to continue their existing cardiac-arrest response practices. Over five years, 11,615 people experienced out-of-hospital cardiac arrest in intervention communities, compared with 10,844 people in comparison communities.
The study did not find a statistically significant improvement in survival with favorable neurological function in the counties that received the program.
What the intervention included
The initiative combined public-facing training with changes inside the emergency-response system. Community CPR education was offered free of charge through schools, workplaces, county government, and other local organizations.
On the EMS side, the program trained 911 dispatchers to recognize cardiac arrest rapidly and to guide callers through CPR. It also sought to enhance first-responder efforts, including greater use of defibrillation before EMS personnel arrived.
The approach was intended to work across entire communities, including rural areas where volunteer first responders can play an especially important role before professional emergency crews reach a patient.
Why early action remains central
Cardiac arrest outside a hospital is a time-critical emergency. Study author Carolina Malta Hansen, a cardiologist and clinical research associate professor at Herlev and Gentofte Hospital and Copenhagen EMS, said the chance of survival falls by about 10% for every minute without CPR while a patient waits for emergency services.
That urgency is why public-health programs often focus on bystander intervention. CPR can help maintain blood flow, while an AED can deliver a shock in some cardiac rhythms before professional responders arrive. Dispatchers can also be pivotal because they may be the first trained people to identify that a caller is describing cardiac arrest and to coach someone nearby through immediate steps.
The RACE-CARS result does not change the importance of prompt CPR or defibrillation. Instead, it raises questions about how much a large, county-level educational and EMS package can shift the most consequential patient outcome when it is deployed across diverse communities and existing response systems.
Limits of a community-wide strategy
Community interventions are difficult to evaluate and implement consistently. Participation in training can vary, as can local emergency-response resources, population density, access to AEDs, and the number of nearby people willing and able to act during an emergency.
Rural counties can face additional challenges, including longer travel times for EMS and a greater reliance on volunteers. A program may improve awareness or parts of the emergency response without producing a detectable change in favorable neurological survival across a population-level trial.
The supplied study summary did not provide detailed results for individual components of the intervention, such as whether CPR rates, AED use, dispatcher recognition, or response times changed. It also did not establish that the program had no value in every setting; its central finding was that the comprehensive package did not significantly improve the trial’s primary patient-centered survival outcome.
What comes next
The findings were presented as preliminary, late-breaking science rather than as a full peer-reviewed publication. Further analysis may help determine which elements of the intervention were most consistently adopted and whether effects differed between rural and more densely populated areas.
For communities, the study underscores the challenge of translating proven emergency actions into durable, broad coverage. Training people in CPR, improving dispatcher-assisted instructions, and increasing access to defibrillation remain practical parts of cardiac-arrest preparedness. But the North Carolina trial suggests that achieving a measurable improvement in favorable survival at scale may require more targeted implementation, different combinations of interventions, or additional system-level changes.
- The five-year RACE-CARS trial covered 60 North Carolina counties.
- It compared a community CPR and EMS intervention with existing practices.
- The intervention did not significantly improve favorable neurological survival after out-of-hospital cardiac arrest.
This article is based on reporting by Medical Xpress. Read the original article.
Originally published on medicalxpress.com
