Standardized Prehospital Extracorporeal Cardiopulmonary Resuscitation (ECPR) Protocol for Refractory Out-of-Hospital Cardiac Arrest: The PrehospECPR-GOKVI Operational Framework

Clinical Rationale and Objectives: Refractory out-of-hospital cardiac arrest (OHCA) is associated with very poor outcomes when treated with conventional cardiopulmonary resuscitation alone, particularly when low-flow time is prolonged. Prehospital extracorporeal cardiopulmonary resuscitation (ECPR) may shorten the interval to extracorporeal perfusion, but its implementation requires a highly standardized operational framework to ensure appropriate patient selection, procedural safety, and efficient use of specialized resources. This manuscript describes the PrehospECPR-GOKVI operational framework, a standardized prehospital ECPR protocol developed by the Gottsegen National Cardiovascular Center in cooperation with the Hungarian National Ambulance Service and the Hungarian Air Ambulance. ECPR Pathway: The programme is based on a dedicated two-person ECPR team, consisting of an experienced physician and a paramedic, deployed with mobile ECPR-specific equipment, including point-of-care ultrasound, a pre-primed VA-ECMO circuit, an ECMO console, and a mobile oxygenator/gas blender. The protocol defines strict inclusion and exclusion criteria, emphasizing witnessed OHCA, age below or apparently below 50 years, initial shockable rhythm or selected pulseless electrical activity with suspected pulmonary embolism, refractory cardiac arrest lasting at least 15 min, no-flow time below 5 min or signs of life, and the feasibility of establishing ECMO flow within 60 min from collapse or emergency call. Two mandatory sonographic STOP criteria are incorporated before cannulation: relevant pericardial effusion or suspected aortic dissection, and inability to safely visualize the femoral artery, femoral vein, and bifurcation. The operational workflow further specifies dispatch activation, ALS continuation, equipment layout, ultrasound-guided femoro-femoral cannulation, failed-access management, air-free circuit connection, post-flow stabilization, receiving-centre notification, and transport to GOKVI. A target interval of no more than 15 min from initiation of ECPR-specific steps to ECMO flow is mandated. Conclusions: The PrehospECPR-GOKVI framework describes a locally developed, standardized operational pathway intended to support early identification, safe procedural preparation, and structured delivery of prehospital ECPR for selected patients with refractory OHCA. The protocol is designed to reduce avoidable delays, standardize ALS–ECPR coordination, and incorporate predefined sonographic safety checkpoints before cannulation. As no patient-level data are reported in this manuscript, feasibility, safety, complication rates, survival, neurological outcomes, resource utilization, and transferability remain to be evaluated prospectively after programme launch.