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Dilated cardiomyopathies as a cause of congestive heart failure
Bernhard Maisch1, Arsen D Ristić, Günter Hufnagel
1Department of Internal Medicine-Cardiology, Angiology, Intensive Care Medicine, and Preventive Cardiology, Philipps University, Marburg, Germany. maisch@mailer.uni-marburg.de
Insights
Cardiomyopathies are heart muscle disorders leading to heart failure. New definitions include inflammatory and viral types, with ongoing research into advanced diagnostic and treatment strategies for these conditions.
Area of Science:
- Cardiology
- Pathology
Background:
- Cardiomyopathies are heart muscle disorders frequently causing congestive heart failure.
- Five major forms exist: dilated, hypertrophic, restrictive, right ventricular, and nonclassifiable.
- New definitions incorporate inflammatory cardiomyopathy (myocarditis with cardiac dysfunction) and viral cardiomyopathy (viral persistence in dilated hearts).
Purpose of the Study:
- To outline the classification of cardiomyopathies, including new definitions.
- To highlight recent advancements in understanding molecular and genetic mechanisms.
- To review emerging diagnostic and therapeutic strategies.
Main Methods:
- Review of current literature and definitions.
- Analysis of molecular and genetic insights.
- Evaluation of ongoing therapeutic trials and novel approaches.
Main Results:
- Established classification includes distinct hemodynamic properties and new inflammatory/viral subtypes.
- Breakthroughs in molecular and genetic understanding are improving diagnostics.
- New therapies under investigation include antiviral, immunoglobulin, immunosuppressive treatments, immunoadsorption, anticytokine, gene therapy, and mechanical support devices.
Conclusions:
- Cardiomyopathy classification has evolved with new definitions for inflammatory and viral forms.
- Advances in molecular and genetic research are enhancing diagnostic capabilities.
- Promising new treatment options are emerging for various cardiomyopathy types.
Definition And Classification:
Cardiomyopathies are disorders affecting the heart muscle that frequently result in congestive heart failure. Five major forms are recognized: dilated, hypertrophic, restrictive, right ventricular, and nonclassifiable cardiomyopathies with distinct hemodynamic properties. Furthermore, the new WHO/WHF definition also comprises inflammatory cardiomyopathy, defined as myocarditis in association with cardiac dysfunction. Idiopathic, autoimmune, and infectious forms of inflammatory cardiomyopathy were recognized. Viral cardiomyopathy is defined as viral persistence in a dilated heart. It may be accompanied by myocardial inflammation and then termed inflammatory viral cardiomyopathy (or viral myocarditis with cardiomegaly). If no inflammation is observed in the biopsy of a dilated heart (< 14 lymphocytes and macrophages/mm2), the term viral cardiomyopathy or viral persistence in dilated cardiomyopathy should be applied.
Diagnosis And Treatment:
In recent years, there have been breakthroughs in understanding the molecular and genetic mechanisms involved in this group of conditions, enabling improvement of diagnostic strategies and introduction of new therapies. Ongoing evaluation of antiviral, immunoglobulin, and immunosuppressive therapies including the European Study of Epidemiology and Treatment of Cardiac Inflammatory Diseases (ESETCID), removal of antibodies by immunoadsorption, anticytokine and gene therapy, as well as the mechanical support devices may provide new treatment options.