Luis SA, Luis CR, Habibian M, et al. - This study was intended to characterize the diagnostic yield of cardiac magnetic resonance (CMR) in differentiating the underlying causes of myocardial infarction with nonobstructive coronary arteries (MINOCA) and to determine the long-term prognostic implications of such diagnoses. Between January 1, 2007, and February 28, 2013, researchers conducted cardiac magnetic resonance evaluation in 227 patients (mean age, 56.4±14.9 years; 120 [53%] female) with a “working diagnosis” of MINOCA as defined by presentation with a troponin-positive acute coronary syndrome (troponin I > 0.04 μg/L) and non obstructed coronary arteries. This study’s findings demonstrate that cardiac magnetic resonance carries a high diagnostic yield in patients with MINOCA and predicts long-term prognosis. According to the findings, individuals with MINOCA with normal CMR imaging had an elevated rate of major adverse cardiac events and lower use of guideline-recommended myocardial infarction therapy in comparison with those with CMR-confirmed myocardial infarction.