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Viral myocarditis and dilated cardiomyopathy: mechanisms, manifestations, and management
M T Kearney1, J M Cotton, P J Richardson
1GKT School of Medicine, King's College London and Department of Cardiology, King's College Hospital, London SE5 9PJ, UK.
Insights
Viral heart infections can cause significant cardiac damage and heart failure. Research is clarifying mechanisms of damage, guiding aggressive hemodynamic support for acute cases and established treatments for chronic conditions.
Area of Science:
- Cardiology
- Infectious Diseases
- Immunology
Background:
- Viral infections commonly affect the heart, often with mild outcomes.
- However, these infections can precipitate severe acute heart failure or progress to chronic heart failure.
- Understanding the mechanisms of viral-induced cardiac damage is crucial for effective management.
Purpose of the Study:
- To review current understanding of mechanisms behind viral-induced heart muscle damage.
- To discuss clinical presentations and management strategies for acute and chronic viral heart disease.
Main Methods:
- Literature review of recent studies on viral myocarditis and its consequences.
- Analysis of immune-mediated and viral-mediated pathways of cardiac injury.
- Review of current treatment guidelines for acute and chronic heart failure secondary to viral cardiomyopathy.
Main Results:
- Evidence supports both immune and direct viral mechanisms in causing cardiac damage.
- Acute myocarditis can manifest diversely, including sudden death in young adults.
- Aggressive hemodynamic support is recommended for acute left ventricular failure due to myocarditis.
Conclusions:
- Viral heart disease pathogenesis is complex, involving immune and viral factors.
- Prompt and aggressive hemodynamic support is vital for acute myocarditis patients to facilitate recovery.
- Established treatments for chronic heart failure, such as ACE inhibitors, beta-blockers, and spironolactone, are beneficial for related dilated cardiomyopathy.
Abstract:
Viral infection of the heart is relatively common and usually of little consequence. It can, however, lead to substantial cardiac damage and severe acute heart failure. It can also evolve into the progressive syndrome of chronic heart failure. Recent studies have gone some way towards unravelling the complex mechanisms underlying the heart muscle damage that occurs after viral infection. These studies have lent support to both immune and viral mediated (independent of an immune response) cardiac damage. Acute myocarditis can present in various ways, and it may be a cause of sudden death in an otherwise healthy young adult. New treatments for viral heart disease are awaited. In the meanwhile, the haemodynamic support of patients with acute left ventricular failure caused by myocarditis should be aggressive, to allow for the possibility of spontaneous recovery. Contemporary trials of treatment in chronic heart failure secondary to dilated cardiomyopathy support the use of angiotensin converting enzyme inhibitors, beta adrenoceptor blockers, and spironolactone in such patients.