Cardiac magnetic resonance imaging (MRI) has emerged as an essential diagnostic tool in cardiology, particularly for evaluating structural and functional abnormalities in the heart. Its utility extends to various conditions, including inflammatory heart disease, cardiomyopathies (CMPs), and myocardial infarction (1, 2). In the context of sudden cardiac arrest (SCA), a significant medical emergency characterized by the abrupt cessation of heart activity, cardiac MRI offers a valuable secondary imaging modality. The primary objective of this systematic review was to assess the diagnostic and prognostic utility of cardiac MRI in adult patients following SCA. The study specifically aimed to evaluate how cardiac MRI contributes to identifying underlying cardiac pathologies, prognostic markers, and its potential to inform clinical decision-making in cases where initial diagnostic modalities, such as electrocardiography, transthoracic echocardiography, or coronary angiography, were inconclusive. This review addresses the significant variability in the diagnostic yield of cardiac MRI and seeks to highlight areas requiring standardization and further research.