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[Dilated cardiomyopathy: electrocardiographic forms].

R Soria, M Desnos, P Benoit

    Archives Des Maladies Du Coeur Et Des Vaisseaux
    |May 1, 1987
    PubMed
    Summary
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    Dilated cardiomyopathy frequently alters QRS complex shape, showing patterns like predominant S waves or left bundle branch block, indicating significant myocardial damage. These electrocardiographic changes highlight left ventricular involvement and potential fibrosis or necrosis.

    Area of Science:

    • Cardiology
    • Electrophysiology
    • Cardiac Pathology

    Context:

    • Dilated cardiomyopathy (DCM) is a significant cause of heart failure.
    • Electrocardiography (ECG) is crucial for diagnosing and managing cardiac conditions.
    • Understanding QRS complex morphology in DCM can provide insights into myocardial substrate.

    Purpose:

    • To classify and interpret the diverse electrocardiographic patterns of the QRS complex in dilated cardiomyopathy.
    • To correlate specific QRS morphologies with underlying myocardial pathology in DCM.
    • To assess the diagnostic and prognostic value of ECG findings in DCM.

    Summary:

    • Analysis of 90 DCM cases revealed 6 distinct QRS complex types.
    • The most common pattern (34.4%) was a predominant S wave with reduced QRS voltage, often with absent R wave progression and ST-T/P wave abnormalities.

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  • Other frequent findings included left bundle branch block (22.2%), left anterior hemiblock (19 cases), QS patterns with ST-T elevation (15.5%), normal QRS with ST-T depression (12.2%), and left ventricular hypertrophy (10%).

    • Impact:

    • These ECG patterns in DCM suggest specific myocardial damage, such as basal left ventricular and septal hypertrophy, fibrosis, necrosis, or subendocardial alterations.
    • The findings emphasize DCM's role in left bundle branch blocks and highlight the association of QS patterns with ventricular tachycardia.
    • ECG analysis provides valuable, non-invasive information about the extent and location of myocardial injury in DCM.