Insights into mildly dilated cardiomyopathy: temporal evolution and long-term prognosis.
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.



From 1988 to 2010 we analysed all DCM patients consecutively evaluated at our Institution. MDCM was defined as LVEF <45% and LV end-diastolic volume index (LVEDVI) ≤70 mL/m2in women and ≤89 mL/m2in 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].



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.
Cardiovascular Department, 'Ospedali Riuniti' and University of Trieste, Trieste, Italy.
Marta
M
Gigli
Cardiovascular Department, 'Ospedali Riuniti' and University of Trieste, Trieste, Italy.
Davide
D
Stolfo
Cardiovascular Department, 'Ospedali Riuniti' and University of Trieste, Trieste, Italy.
Marco
M
Merlo
Cardiovascular Department, 'Ospedali Riuniti' and University of Trieste, Trieste, Italy.
Giulia
G
Barbati
Cardiovascular Department, 'Ospedali Riuniti' and University of Trieste, Trieste, Italy.
Federica
F
Ramani
Cardiovascular Department, 'Ospedali Riuniti' and University of Trieste, Trieste, Italy.
Francesca
F
Brun
Cardiovascular Department, 'Ospedali Riuniti' and University of Trieste, Trieste, Italy.
Bruno
B
Pinamonti
Cardiovascular Department, 'Ospedali Riuniti' and University of Trieste, Trieste, Italy.
Gianfranco
G
Sinagra
D000328:Adult; D057911:Angiotensin Receptor Antagonists / Q000627:therapeutic use; D000806:Angiotensin-Converting Enzyme Inhibitors / Q000627:therapeutic use; D000818:Animals; D001145:Arrhythmias, Cardiac / Q000209:etiology; D058406:Cardiac Resynchronization Therapy; D002311:Cardiomyopathy, Dilated / Q000150:complications / Q000401:mortality / Q000503:physiopathology* / Q000628:therapy; D017147:Defibrillators, Implantable; D018450:Disease Progression; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D011379:Prognosis; D016016:Proportional Hazards Models; D012372:ROC Curve; D012189:Retrospective Studies; D012720:Severity of Illness Index; D013318:Stroke Volume; D017180:Tachycardia, Ventricular / Q000209:etiology; D013997:Time Factors
D057911:Angiotensin Receptor Antagonists; D000806:Angiotensin-Converting Enzyme Inhibitors
Cardiomyopathy; Echocardiography; Heart failure; Prognosis