In patients with dilated cardiomyopathy undergoing CRT, left ventricular midwall fibrosis strongly predicted cardiovascular mortality (HR 18.6; 95% CI 3.51-98.5; p=0.0008).
Cohort (n=258)
Does left ventricular midwall fibrosis predict mortality and morbidity in patients with dilated cardiomyopathy undergoing cardiac resynchronization therapy?
Left ventricular midwall fibrosis detected by CMR is a strong, independent predictor of mortality and morbidity in patients with nonischemic dilated cardiomyopathy undergoing CRT, conferring a risk similar to that of ischemic cardiomyopathy.
Hazard Ratio: 18.6 (95% CI 3.51–98.5)
p-value: p=0.0008
OBJECTIVES: The aim of this study was to determine whether left ventricular (LV) midwall fibrosis, detected by midwall hyperenhancement (MWHE) on late gadolinium enhancement cardiovascular magnetic resonance (CMR) imaging, predicts mortality and morbidity in patients with dilated cardiomyopathy (DCM) undergoing cardiac resynchronization therapy (CRT). BACKGROUND: Midwall fibrosis predicts mortality and morbidity in patients with DCM. METHODS: Patients with DCM with (+) or without (-) MWHE (n = 20 and n = 77, respectively) as well as 161 patients with ischemic cardiomyopathy (ICM) undergoing CRT (n = 258) were followed up for a maximum of 8.7 years. RESULTS: Among patients with DCM, +MWHE predicted cardiovascular mortality (hazard ratio HR: 18.6; 95% confidence intervals CI: 3.51 to 98.5; p = 0.0008), total mortality or hospitalization for major adverse cardiovascular events (HR: 7.57; 95% CI: 2.71 to 21.2; p < 0.0001), and cardiovascular mortality or heart failure hospitalizations (HR: 9.56; 95% CI: 2.72 to 33.6; p = 0.0004), independent of New York Heart Association class, QRS duration, atrial fibrillation, LV volumes, LV ejection fraction, and a CMR-derived measure of dyssynchrony. Among patients with DCM and ICM, the risk of cardiovascular mortality for DCM +MWHE (adjusted HR: 18.5; 95% CI: 3.93 to 87.3; p = 0.0002) was similar to that for ICM (adjusted HR: 21.0; 95% CI: 5.06 to 87.2; p < 0.0001). Both DCM +MWHE and ICM were predictors of pump failure death as well as sudden cardiac death. LV reverse remodeling was observed in DCM -MWHE and in ICM but not in DCM +MWHE. CONCLUSIONS: Midwall fibrosis is an independent predictor of mortality and morbidity in patients with DCM undergoing CRT. The outcome of DCM with midwall fibrosis is similar to that of ICM. This relationship is mediated by both pump failure and sudden cardiac death.
Leyva et al. (Wed,) conducted a cohort in Dilated cardiomyopathy and ischemic cardiomyopathy (n=258). Left ventricular midwall fibrosis (+MWHE) vs. Absence of midwall fibrosis (-MWHE) was evaluated on Cardiovascular mortality (HR 18.6, 95% CI 3.51 to 98.5, p=0.0008). In patients with dilated cardiomyopathy undergoing CRT, left ventricular midwall fibrosis strongly predicted cardiovascular mortality (HR 18.6; 95% CI 3.51-98.5; p=0.0008).