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Transient QRS changes simulating acute myocardial infarction

M A Hassett, R R Williams, G S Wagner

    Circulation
    |November 1, 1980
    PubMed
    Summary
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    This study identified a rare syndrome of transient abnormal QRS forces in 0.25% of patients, unrelated to heart attack or overload. These ECG changes resolved quickly, suggesting a temporary conduction issue rather than infarction.

    Area of Science:

    • Cardiology
    • Electrocardiography
    • Medical Diagnostics

    Background:

    • Abnormal initial QRS forces can indicate serious cardiac conditions like myocardial infarction or ventricular overload.
    • Distinguishing these forces from transient, benign phenomena is crucial for accurate diagnosis.

    Purpose of the Study:

    • To investigate the characteristics and incidence of unexplained abrupt abnormal initial QRS forces.
    • To differentiate these ECG findings from acute myocardial infarction and ventricular overload.

    Main Methods:

    • Analysis of computerized ECG data from 3175 patients with suspected acute myocardial infarction.
    • Identification of patients with diagnostic QRS changes but normal creatine kinase and lactic dehydrogenase isoenzyme profiles.
    • Minimization of lead misplacement errors through multispace tracings and vectorcardiograms.

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    Main Results:

    • Eight patients (0.25%) exhibited transient abnormal initial QRS forces with normal isoenzyme profiles.
    • Abnormalities were primarily in precordial leads (V1-3, V4-6, or all).
    • Complete resolution of QRS changes within 6 days, supporting a non-infarction etiology.

    Conclusions:

    • A rare syndrome of transient loss of initial anterior forces occurs with a very low incidence (0.25%).
    • The transient nature and normal isoenzyme profiles suggest it is not acute myocardial infarction.
    • A possible cause is a transient conduction block in the left bundle branch septal fascicle.