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Delayed repolarization syndrome.

P Schweitzer, H Mark

    The American Journal of Medicine
    |September 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Atypical ventricular tachycardia electrocardiograms showed similar patterns in patients with and without delayed repolarization. QRS morphology alone cannot differentiate these conditions, suggesting a new term for the arrhythmia.

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    Area of Science:

    • Cardiology
    • Electrophysiology

    Background:

    • Atypical ventricular tachycardia (VT) encompasses various arrhythmias like torsade de pointes and polymorphic VT.
    • Delayed repolarization, indicated by prolonged Q-T intervals or abnormal U waves, is a known factor in cardiac arrhythmias.

    Purpose of the Study:

    • To analyze electrocardiographic (ECG) findings in atypical ventricular tachycardia.
    • To determine if QRS morphology during tachycardia can distinguish between delayed repolarization and other causes.
    • To propose a standardized term for arrhythmias associated with abnormal repolarization.

    Main Methods:

    • Analysis of electrocardiograms from 18 patients diagnosed with atypical ventricular tachycardia.
    • Classification of patients into two groups: those with delayed repolarization (prolonged Q-T or abnormal U waves) and those with normal ventricular repolarization.

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  • Comparison of ECG manifestations across both groups.

    • Main Results:

    • All observed electrocardiographic manifestations of atypical ventricular tachycardia were present in both patient groups.
    • No significant difference in ECG patterns was found between patients with and without delayed repolarization.
    • QRS morphology during tachycardia did not reliably differentiate between delayed repolarization and other etiologies.

    Conclusions:

    • Electrocardiographic QRS morphology during atypical ventricular tachycardia is insufficient for distinguishing delayed repolarization from other causes.
    • The term "delayed repolarization syndrome" is recommended to identify this specific group of arrhythmias due to variable ECG presentations.
    • This finding aids in better classification and understanding of ventricular tachycardia.