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[Pathogenesis of dilated cardiomyopathy: a study based on comparison of the clinical features with other related
1First Department of Internal Medicine, Kobe University School of Medicine.
Insights
Dilated cardiomyopathy (DCM) may encompass diverse subtypes with varying causes. This study suggests common underlying factors in DCM pathogenesis, potentially linking it to other myocardial diseases.
Area of Science:
- Cardiology
- Pathophysiology
- Medical Diagnostics
Background:
- Dilated cardiomyopathy (DCM) pathogenesis and pathophysiology require further investigation.
- Understanding DCM subtypes is crucial for effective treatment.
Purpose of the Study:
- To investigate the pathogenesis and pathophysiology of dilated cardiomyopathy (DCM).
- To categorize DCM based on echocardiographic findings and compare with other cardiomyopathies.
Main Methods:
- Echocardiography and endomyocardial biopsy were used to study 28 DCM patients.
- Findings were compared with patients diagnosed with myocarditis, alcoholic cardiomyopathy, hypertensive heart disease, and hypertrophic cardiomyopathy.
Main Results:
- DCM patients exhibited distinct echocardiographic patterns, forming two subsets: one with marked left ventricular dilatation and uniform wall motion (similar to alcoholic cardiomyopathy), and another with less dilatation and heterogeneous wall motion (similar to myocarditis).
- Hypertensive patients presented with heart failure and left ventricular abnormalities that resolved with medical management.
- Myocarditis and hypertrophic cardiomyopathy groups showed smaller ventricles and increased myocardial fibrosis.
Conclusions:
- Dilated cardiomyopathy likely comprises multiple subsets with different etiologies.
- Common pathogenic factors may link DCM to specific myocardial diseases, suggesting overlapping pathophysiological mechanisms.
Abstract:
To investigate the pathogenesis and pathophysiology of dilated cardiomyopathy (DCM), we studied 28 patients with DCM by echocardiography and endomyocardial biopsy, and compared their findings with those of 34 patients including eight with myocarditis, seven with alcoholics, 12 with hypertensives and seven patients with hypertrophic cardiomyopathy. All 12 patients in the hypertensive group had congestive heart failure without accompanying high blood pressure, and prominent dilatation and uniform wall motion abnormality of the left ventricle observed echocardiographically on admission. After medical management, both heart failure and the echocardiographic abnormalities gradually resolved. Those in the alcoholic group had larger left ventricles and uniform wall motion abnormality compared to those in the other groups. The myocarditis and hypertrophic cardiomyopathy groups had smaller left ventricles, non-uniform wall motion and larger % myocardial fibrosis. Both ventricles in the hypertrophic cardiomyopathy group were thicker than those of the other three groups. Each patient with DCM had individual echocardiographic abnormalities, which could be categorized as two subsets depending on the degree of left ventricular dilatation and uniformity of the wall motion. The one was characterized by a prominently dilated left ventricle and uniform wall motion abnormality similar to the alcoholic group, and the other had less marked left ventricular dilatation and heterogeneous wall motion abnormality similar to the myocarditis group. From these findings, it was suggested that there are common factors to specific myocardial disease in the pathogenesis and pathophysiology of DCM, and thus, DCM might include many subsets of different etiologies.