Dilated cardiomyopathy and myocarditis: natural history, etiology, clinical manifestations, and management

Area of Science:

• Cardiology
• Pathology
• Immunology

Background:

• Dilated cardiomyopathy (DCM) presents with varied patient outcomes and diagnostic challenges.
• Current management for DCM is primarily supportive and nonspecific.
• Prognostic factors are identified, but major survival determinants remain unrecognized.

Purpose of the Study:

• To review the current understanding and uncertainties surrounding dilated cardiomyopathy.
• To explore potential etiologies, including viral and immunoregulatory factors.
• To highlight areas for future research in cardiac cellular biology.

Main Methods:

• Review of natural history studies and existing literature on dilated cardiomyopathy.
• Analysis of documented prognostic factors and sudden cardiac death frequency.
• Discussion of emerging evidence for viral etiology and immune system involvement.

Main Results:

• Dilated cardiomyopathy diagnosis is often one of exclusion, with management lacking specific therapies.
• Sudden cardiac death is common, but risk stratification and antiarrhythmic efficacy are unestablished.
• Cardiac transplantation shows emerging success, offering a potential treatment avenue.

Conclusions:

• The precise causes of dilated cardiomyopathy remain elusive, despite evidence suggesting viral or immune involvement.
• A cellular-level disturbance is implied by functional deficits disproportionate to histologic findings.
• Further investigation into fundamental cardiac cellular biology is crucial for understanding and treating DCM.