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[Electrocardiogram in dilated cardiomyopathy].

J Barbosa Filho, F M Albanese Filho, P R Barbosa

    Revista Portuguesa De Cardiologia : Orgao Oficial Da Sociedade Portuguesa De Cardiologia = Portuguese Journal of Cardiology : an Official Journal of the Portuguese Society of Cardiology
    |November 1, 1989
    PubMed
    Summary
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    Electrocardiographic findings in dilated cardiomyopathy reveal frequent arrhythmias, particularly ventricular arrhythmias (87.5%). Left ventricular hypertrophy was common, often presenting with specific wave patterns, while bundle branch blocks also occurred.

    Area of Science:

    • Cardiology
    • Electrophysiology
    • Internal Medicine

    Context:

    • Dilated cardiomyopathy (DCM) is a significant cause of heart failure.
    • Electrocardiography (ECG) is a primary diagnostic tool for cardiac conditions.
    • Understanding ECG patterns in DCM can aid in diagnosis and risk stratification.

    Purpose:

    • To detail the main electrocardiographic features observed in 90 patients with dilated cardiomyopathy.
    • To categorize patients based on specific ECG findings like left ventricular hypertrophy and bundle branch blocks.
    • To analyze the prevalence of various arrhythmias within these patient groups.

    Summary:

    • Ninety DCM patients were grouped by ECG: left ventricular hypertrophy (71%), complete left bundle branch block (24.6%), and right bundle branch block (4.4%).

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  • Arrhythmias were prevalent (80%), with ventricular arrhythmias (87.5%) and supraventricular arrhythmias (58%) being most common.
  • Specific ECG findings included prominent S waves in right precordial leads for LVH, and atrial fibrillation occurred in 28% of all patients.

    • Impact:

    • This study highlights characteristic ECG abnormalities in DCM, aiding in early identification and management.
    • The findings can improve the diagnostic accuracy of ECG in differentiating DCM subtypes.
    • Understanding these ECG patterns may contribute to predicting patient outcomes and guiding therapeutic strategies.