Mildly dilated cardiomyopathy was associated with a lower 10-year rate of all-cause mortality or heart transplantation compared to dilated cardiomyopathy (15% vs 30%, P<0.001).
Cohort (n=638)
Does mildly dilated cardiomyopathy have a different long-term prognosis compared to typical dilated cardiomyopathy?
Mildly dilated cardiomyopathy represents a less advanced stage of disease with better long-term survival than typical DCM, though a quarter of patients progress to DCM and those with restrictive filling or non-sustained ventricular tachycardia face poor outcomes.
Absolute Event Rate: 15% vs 30%
p-value: p=< 0.001
AIMS: Mildly dilated cardiomyopathy (MDCM) has been proposed as a subtype of dilated cardiomyopathy (DCM) characterized by systolic dysfunction in the absence of significant LV dilatation. Few data on the characteristics and outcomes of MDCM patients are available. We sought to assess the main features and the long-term natural history of MDCM. METHODS AND RESULTS: in men. Among a total population of 638 patients, 226 (35%) fulfilled the criteria for MDCM. Compared with the other patients, they presented features of a less advanced disease and an overall long-term lower rate of all-cause mortality/heart transplantation (D/HTx; total events = 209; 144 deaths, 65 HTx): D/HTx at 10 years 15% in MDCM vs. 30% in DCM (P < 0.001). However, throughout the follow-up, 55 MDCM patients (24%) evolved to DCM by increasing LVEDVI, consistently worsening their long-term prognosis. Among persistent MDCM patients, a restrictive filling pattern hazard ratio (HR) 5.30; 95% confidence interval (CI) 2.34-12.01, P < 0.001 and non-sustained ventricular tachycardia (HR 2.21; 95% CI 1.003-5.11, P = 0.047), but not LVEF, were independently associated with D/HTx at multivariate analysis time-dependent receiver operating characteristic (ROC) curve: area under the curve (AUC) 0.80, 95% CI 0.65-0.94, P = 0.003. CONCLUSIONS: MDCM identifies a consistent subgroup of DCMs diagnosed in an earlier stage and presenting an apparent better evolution. However, some MDCMs evolve into DCM despite medical therapy, whereas persistent MDCMs with non-sustained ventricular arrhythmias and restrictive filling pattern are characterized by a very poor outcome.
Gigli et al. (Fri,) conducted a cohort in Mildly dilated cardiomyopathy (n=638). Mildly dilated cardiomyopathy vs. Dilated cardiomyopathy was evaluated on All-cause mortality or heart transplantation (p=< 0.001). Mildly dilated cardiomyopathy was associated with a lower 10-year rate of all-cause mortality or heart transplantation compared to dilated cardiomyopathy (15% vs 30%, P<0.001).