Dilated Cardiomyopathy: Echo Approaches and Differential Diagnosis (in the Context of ESC 2023)
Important Limitation of the Source
The provided excerpts lack specific echocardiographic criteria for dilated cardiomyopathy (DCM) and its differential diagnosis algorithm according to the ESC 2023 guidelines (2023 ESC guidelines for the management of cardiomyopathies). A reference to this document is present in the bibliography, but its substantive provisions (LV dilation thresholds, LVEF reduction criteria, diagnostic criteria) are not included in the excerpts — [clarify] from the primary source.
Available Parameters for Assessing Heart Chambers
From the excerpts, one can rely on general principles for assessing chamber sizes and function, which are applicable when examining a patient suspected of having DCM.
Assessment of the Left Atrium in Obesity (BMI >30 kg/m²). Indexing the LA volume to height or height squared is recommended.
| Indexing Parameter | Dilation Criterion (Men) | Dilation Criterion (Women) |
|---|---|---|
| LA Volume / Height | >35.7 ml/m | >33.7 ml/m |
| LA Volume / Height² | >18.5 ml/m² | >16.5 ml/m² |
All three parameters predict mortality in individuals with severe obesity. For assessing LV myocardial mass, indexing to the ideal body surface area is recommended.
Diastolic Function and Strain
Today, the assessment of diastolic function is unthinkable without analyzing left atrial strain. Pathological LA strain values indicate diastolic dysfunction (the term "atrial dysfunction" has been introduced). For some groups (athletes, the elderly), physiological LA dilation requires primarily focusing on clinical presentation plus additional diastolic parameters and LA strain.
Differential Diagnosis
The excerpts contain references to studies on the differential diagnosis of cardiac amyloidosis using deformation and non-deformation parameters, as well as the role of echocardiography in hypertrophic cardiomyopathy. Specific threshold values for distinguishing DCM from other causes of LV dysfunction are not presented in the provided materials — [clarify].
Frequently asked questions
Are there specific echo criteria for LV dilation in DCM in the source?
No. The provided excerpts do not include threshold values for LV dilation and LVEF reduction for the diagnosis of DCM — [clarify] from the ESC 2023 primary source.
How to assess the left atrium in a patient with obesity?
By indexing the LA volume to height (dilation: >35.7 ml/m in men, >33.7 ml/m in women) or to height squared (>18.5 ml/m² in men, >16.5 ml/m² in women).
Is left atrial strain necessary?
Yes. Diastolic function assessment is not performed without LA strain; its pathological values indicate diastolic (atrial) dysfunction, even in athletes with borderline LA size.
How to interpret chamber dilation in athletes and the elderly?
Primarily focus on clinical presentation and additional diastolic parameters, including LA strain; in the absence of symptoms, isolated dilation may be normal.