Call to Door Timing in Out-of-hospital Cardiac Arrest

According to "2020 American Heart Association Guidelines for Cardiopulmonary Resuscitation and Emergency Cardiovascular Care", immediate call for the local emergency response number takes a key role in the OHCA as the CPR in community does not provide quality of in-hospital CPR. The strong recommendation of speedy transportation, however, does not provide time limitation, and evident data supporting benefit within certain minutes to transfer is lack through our best of search. Therefore, The investigators aimed to investigate the effect of delayed hospitalization on the basis of the call time on the clinical outcomes of patients with OHCA patients using a nationwide OHCA registry.