Dilated cardiomyopathy (DCM) describes ventricular dilation with impaired systolic function that is not sufficiently explained by coronary artery disease, abnormal loading conditions or another obvious cardiac cause. DCM is a disease category, not simply another name for heart failure. A specialist review should look for the underlying cause, genetic and family implications, myocardial scar or inflammation, arrhythmias and potentially reversible contributors before long-term treatment or device decisions are made.
Confirm DCM and investigate the cause
The diagnostic pathway should distinguish primary or genetic DCM from ischemic heart disease, inflammatory or toxic myocardial injury, tachycardia-mediated disease, metabolic causes and other cardiomyopathies because the cause can change treatment and family screening.
- Echocardiography with ventricular size and ejection fraction
- ECG and ambulatory rhythm monitoring
- Cardiac MRI for ventricular function, scar and tissue characterization when appropriate
- Coronary assessment when ischemic disease remains possible
- Laboratory evaluation for reversible or systemic causes
- Myocardial biopsy in selected unresolved or inflammatory cases
- Three-generation family history and genetic counselling/testing when appropriate
Heart-failure therapy is central but cause-specific treatment still matters
Patients with reduced ventricular function generally require evidence-based heart-failure management, but treatment should also address the identified driver of the cardiomyopathy where possible. The same DCM phenotype can arise from different mechanisms and should not be treated as a single travel package.
Arrhythmia and sudden-death risk require separate assessment
DCM can be associated with atrial and ventricular arrhythmias. ICD or CRT decisions depend on ventricular function, conduction pattern, myocardial scar, genotype, symptoms and response to medical therapy rather than the DCM label alone.
Valve regurgitation may be secondary to ventricular remodeling
Functional mitral or tricuspid regurgitation can accompany ventricular dilation. Valve intervention is not automatically the first treatment; the specialist team should assess ventricular therapy, symptoms, anatomy and whether an interventional or surgical valve procedure is likely to add benefit.
Advanced DCM may require an advanced-heart-failure pathway
Patients who remain severely symptomatic despite appropriate treatment may need evaluation for advanced options such as mechanical circulatory support or heart transplantation. Evaluation is individualized and requires a specialist center; it is not a guaranteed next step for a patient with low ejection fraction.
Records for an international DCM review
Send the material that helps the German center understand both the severity and the suspected cause.
- Echocardiography and cardiac MRI images/reports
- Coronary angiography or CT results if performed
- Holter/event-monitor reports
- Prior myocarditis, chemotherapy/toxin or systemic-disease history
- Myocardial biopsy/pathology results if available
- Genetic test results and family history if available
- Current heart-failure and rhythm medications
- Device interrogation reports if an ICD/CRT is already implanted
Sources and review
This guide was last source-reviewed on 2026-08-31.