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[Myocarditis and dilated cardiomyopathy in children. Old questions-- new answers]
1Klinika za djecje bolesti Rebro, Medicinski fakultet Sveucilista u Zagrebu, Klinicki bolnicki centar, Zagreb.
Insights
Differentiating myocarditis from dilated cardiomyopathy requires a complex diagnostic approach. Heart muscle biopsy and advanced analysis are crucial for accurate etiological diagnosis and effective treatment strategies.
Area of Science:
- Cardiology
- Pathology
- Immunology
Context:
- Distinguishing between myocarditis and dilated cardiomyopathy (DCM) presents significant diagnostic challenges.
- Both conditions involve myocardial dysfunction, but their underlying causes and management differ substantially.
- Current diagnostic criteria from WHO and ISFC define DCM by ventricular enlargement and systolic dysfunction, often leading to heart failure.
Purpose:
- To elucidate the diagnostic dilemmas in differentiating myocarditis from various etiologies of dilated cardiomyopathy.
- To outline the necessary diagnostic flow diagram and routine methods for accurate etiological diagnosis.
- To discuss treatment strategies for DCM and acute myocarditis, including the role of immunosuppression.
Summary:
- Accurate etiological diagnosis of DCM is unattainable without endomyocardial biopsy.
- Biopsy specimens require comprehensive analysis, including light microscopy (Dallas criteria), electron microscopy, immunohistology, and immunohistochemistry (in situ hybridization).
- Treatment guidelines emphasize avoiding digoxin in acute myocarditis and utilizing alternative inotropic agents, alongside discussing immunosuppressive therapy for specific conditions.
Impact:
- Establishes a framework for improved differential diagnosis of myocardial diseases.
- Highlights the critical role of invasive diagnostics (biopsy) in achieving etiological clarity for DCM.
- Informs clinical practice regarding appropriate therapeutic interventions for myocarditis and DCM, potentially improving patient outcomes.
Abstract:
The purpose of this article is to discuss the dilemmas in differential diagnosis of myocarditis and dilated cardiomyopathy of different etiologies. According to the definition of the WHO and the ISFC the dilated cardiomyopathy is a myocardial disease recognized by the severe enlargement of the left and/or the right ventricle causing the decrease in systolic function of the heart (decrease of contractility) with the development of congestive heart failure. In order to distinguish primary cardiomyopathies defined as a muscle heart disease sui generis on the one hand from cardiomyopathies as the outcome of chronic inflammatory myocarditis (chronic persistent myocarditis, chronic immune myocarditis, chronic viral heart disease) on the other hand, it is necessary to follow a complicated diagnostic flow diagram. Methods that are to become routine in diagnostic procedure are described. Etiologic diagnosis of dilated cardiomyopathies is not possible without heart muscle biopsy. The bioptic specimens must be analyzed using light microscope (according to Dallas criteria), electron microscope, and afterwards immunohistologically and immunohistochemically (in situ hybridization). The total result of these investigations leads to the final conclusion about etiological diagnosis of dilated cardiomyopathy. The directions in the treatment of dilated cardiomyopathies and acute myocarditis are stated, as well as the importance of immunosuppressive therapy in these conditions. In the treatment of acute myocarditis digoxin should be avoided and other inotropic substances used instead.