A study of 1,376 patients that suffered a witnessed cardiac arrest outside of the hospital between 2005 and 2009 has been resleased. All of the patients included in the study received CPR and AED shocks from bystanders. 63% of the patients received conventional 30:2 CPR (30 compressions followed by two breaths) while 37% received Hands Only CPR (non-stop chest compressions).

Neurologically intact survival to discharge of the hospital was much higher when the patient received Hands Only CPR.

Hands Only CPR: 40.7% neurologically intact vs. 30:2 CPR: 32.9% neurologically intact.

This study shows the importance of minimizing interruptions in chest compressions.