Diagnostic Accuracy of ECG-less Gated Cardiac CT in Resuscitated Cardiac Arrest Survivors Without ST Elevation Myocardial Infarction

* Inclusion: * Adults (≥18 years) with sustained return of spontaneous circulation (ROSC) following in/out-of-hospital cardiac arrest. * Informed consent from patient or representative obtained before invasive coronary angiography. * Exclusion * Patients on VA-ECMO * ACS STEMI or STEMI "equivalent" * New left/right bundle branch block * ST segment depression in leads V1-V3, when the terminal T wave is positive and concomitant ST-segment elevation ≥ 0,5mm recorded in leads V7-V9 (posterior MI) * ST-segment elevation in V7-V9 (posterior MI) or V3R-V4R (RV MI) * ACS NSTEMI with persistent ST depression despite optimal therapy, suggesting ongoing myocardial ischemia, with indication for an urgent ICA according to the treating physician. * Hemodynamic/electrical instability precluding CT imaging (as perceived by the treating physician) * Life-threatening arrhythmia potentially caused by acute myocardial ischemia * Absolute contraindications to iodinated contrast * Patients with a known non-cardiac cause of cardiac arrest (e.g., traumatic brain injury, overt hemorrhage, asphyxia/severe hypoxia due to known lung disease, trauma, severe metabolic/electrolyte derangement, or intoxication) as perceived by the treating physician, where chest CT is considered unnecessary. * Known or likely pregnancy or lactation * Severe bleeding issue (as perceived by the treating physician) precluding heparin administration during radial access coronary angiography. * Prior coronary intervention (stent implantation/CABG). * CT findings indicating a condition that precludes coronary angiography in the short term. * Patients with end-of-life care pathways. * Participation in another intervention study interfering with the research questions in OPEN CCT Arrest.