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OBJECTIVES to evaluate the prognosis role of late gadolinium enhancement (LGE) on cardiac magnetic resonance imaging (cMRI) in patients with non-ischemic dilated cardiomyopathy (NIDM). BACKGROUND Risk stratification in NIDM needs to be improved. METHODS We included 210 patients with NIDM and cMRI from 2005 to 2018 in our study population. Outcomes were retrospectively assessed by medical records. The pattern of LGE was classified as mid-wall, sub-epicardial, or both patterns. Primary endpoint was sudden cardiac death (SCD) or aborted SCD. Secondary endpoints were global mortality and a composite endpoint of cardiovascular mortality and heart failure hospitalization. Demographic and clinical parameters were also evaluated. Patients with LGE (LGE+) were more likely to be male (80,6% vs 66,7%, p= 0,03). No significant differences were observed between LGE+ and LGE- patients in comorbidities, NYHA class, left ventricular ejection fraction (LVEF), or neurohormonal treatment. RESULTS Of 210 patients (71,4% men, median age 59,8 years) with a median follow up of 5,6 years (3,24-8,15), 72 patients (34,3%) had non ischemic LGE (LGE+) on cMRI. Mean left ventricular ejection fraction (LVEF) was 34%. SCD or aborted SCD occurred in 11 patients (5,2%): 6 patients (9,5%) with LGE+ vs 5 patients (4,07 %) of LGE- (p = 0,19). Patients with LGE+ had a higher risk for the composite endpoint (cardiovascular mortality and heart failure hospitalization): OR 2,45, confidence interval (CI): 1,16-5,17, (p = 0,02). LGE presence was not associated with global mortality. The subepicardial pattern of LGE was associated with SCD or aborted SCD. 3 out of 11 patients (27%), with subepicardial pattern of LGE suffered from SCD or aborted SCD (p= 0,01). CONCLUSIONS In our cohort of 210 patients with NIDM, LGE was not significatively associated with SCD or aborted SCD, probably because of a low event rate (5,2%) in a relatively small and well treated population, despite a long follow-up (5,6 years). On the other hand, LGE presence was associated with a higher risk for the composite endpoint of cardiovascular mortality and heart failure hospitalization. Finally, the subepicardial pattern of LGE identified a group of patients at high risk of SCD and aborted SCD.

P1595 Prognostic role of late gadolinium enhancement for sudden cardiac death risk in non-ischemic dilated cardiomyopathy