RecruitingDevice studyInternational Device Assisted Controlled Sequential Elevation CPR RegistryThe purpose of this prospective observational cardiopulmonary resuscitation (CPR) registry is to track the use and clinical outcomes from emergency medical systems across the US and Europe that have implemented a system of care approach applied rapidly to cardiac arrest that includes using the combination of an impedance threshold device (ITD), and either manual active compression-decompression (ACD) CPR device or automated compression device, with a Head Up CPR device.