P994Association of late gadolinium enhancement with prognosis and sudden cardiac death risk in non-ischemic dilated cardiomyopathy

Abstract

Abstract Objectives to evaluate the association between late gadolinium enhancement (LGE) on cardiac magnetic resonance imaging (cMRI) and prognosis in patients with non-ischemic dilated cardiomyopathy (NIDM). Background Risk stratification in NIDM needs to be improved. Methods A total of 210 patients with NIDM and cMRI from 2005 to 2018 were included in our population. Outcomes were retrospectively assessed by medical records. The pattern of LGE was classified as midwall, subepicardial, or both patterns. Primary endpoint was sudden cardiac death (SCD) and 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), left bundle branch block 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+). Mean LVEF was 34%. SCD or aborted SCD occurred in 11 patients (5,2%). 6 patients (9,5%) with LGE+ reached the primary endpoint vs 5 (4,07%) of LGE− patients (p=0,19). The adjusted OR for the presence of LGE in the composite endpoint (cardiovascular mortality and heart failure hospitalization) was 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 and aborted SCD: 3 out of 11 patients (27, 1%) with subepicardial pattern of LGE suffered from SCD or aborted SCD (p=0,02). Conclusions In our cohort of 210 patients with NIDM, LGE presence was not associated with SCD and aborted SCD, probably because of low event rate in a relatively small population. However, LGE presence was associated with the composite endpoint of cardiovascular mortality and heart failure hospitalization. The subepicardial pattern of LGE identified patients at high risk of SCD and aborted SCD.