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[Epidemiology-etiology of dilated cardiomyopathy]
1Medizinische Klinik II, Krankenhaus St. Elisabeth und St. Barbara, Mauerstr. 5 06110 Halle, Saale.
Insights
Dilated cardiomyopathy (DCM) is the most common heart muscle disease. Research suggests impaired myocardial cytoskeleton function may be a key mechanism in both genetic and viral-induced DCM.
Area of Science:
- Cardiology
- Pathology
- Genetics
Background:
- Dilated cardiomyopathy (DCM) is the most prevalent cardiomyopathy.
- Its etiology is diverse, with 50% of cases being idiopathic and the remainder linked to various factors like myocarditis, ischemic heart disease, and hypertension.
- Genetic factors and inflammatory/immunological phenomena account for 20-30% of idiopathic DCM cases.
Purpose of the Study:
- To explore the potential pathogenetic mechanisms underlying dilated cardiomyopathy (DCM).
- To investigate the role of myocardial cytoskeleton impairment in the development of DCM.
- To examine the link between infectious triggers, like enteroviruses, and immune-mediated DCM.
Main Methods:
- Review of existing literature on cardiomyopathies, focusing on dilated cardiomyopathy.
- Analysis of etiological factors contributing to DCM, including genetic and infectious causes.
- Examination of studies investigating myocardial cytoskeleton function in DCM patients.
Main Results:
- Impairment of myocardial cytoskeleton constituents has been observed in familial DCM.
- Similar cytoskeletal abnormalities are found in DCM cases associated with Coxsackie-virus B infection.
- These findings suggest a common pathogenetic pathway involving cytoskeletal dysfunction.
Conclusions:
- Myocardial cytoskeleton impairment is a potential key mechanism in the pathogenesis of dilated cardiomyopathy.
- Both genetic predispositions and viral infections (e.g., enteroviruses) may lead to DCM through disruption of cytoskeletal integrity.
- Further research into cytoskeletal function is warranted for understanding and potentially treating DCM.
Abstract:
Among the cardiomyopathies,--dilated cardiomyopathy (dcm), hypertrophic cardiomyopathy, restrictive cardiomyopathy, arrhythmogenic right ventricular cardiomyopathy--, dcm is the most frequent entity. Its prevalence in the United States amounts to 36 cases per 100,000 inhabitants, men being almost 3-fold more involved than women. The etiology of dcm is very heterogenous; 50% of the cases are due to idiopathic dcm whereas the other half comprises a broad spectrum of various etiologies such as myocarditis, ischemic heart disease, peripartal cardiomyopathy, hypertension, HIV infection, toxic cardiomyopathy and others. In 20 to 30% of the cases of idiopathic dcm a genetic transmission of the disease has been found. Another 20 to 30% of idiopathic dcm are associated with inflammatory and immunological phenomena. Infectious myocarditis with enteroviruses, especially with coxsackie-virus type B has been suggested to be an important trigger for an immune-mediated dcm. In both, familiar dcm and infection with coxsackie-virus B, an impairment of constituents of the myocardial cytoskeleton has been shown. This is regarded as a possible pathogenetic mechanism in the development of dcm.