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Related Experiment Videos

Transient abnormal Q waves during acute myocardial infarction.

C Athanasopoulos, A Michalopoulos

    Acta Cardiologica
    |January 1, 1978
    PubMed
    Summary

    Transient Q waves during myocardial infarction may indicate a temporary block in the left bundle system, explaining specific ECG changes in heart attack patients.

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    Area of Science:

    • Cardiology
    • Electrophysiology
    • Medical Diagnostics

    Background:

    • Acute myocardial infarction diagnosis relies on serial enzyme changes and electrocardiogram (ECG) findings.
    • Q waves on ECG typically indicate irreversible myocardial damage.

    Observation:

    • A 65-year-old woman experienced transient Q waves in specific ECG leads (V2-V4, II, III, aVF) during acute chest pain.
    • These Q waves resolved within 12 hours, indicating a non-permanent myocardial injury pattern.

    Findings:

    • The transient Q waves are hypothesized to result from a focal block in the septal fibers of the left bundle branch system.
    • This transient conduction defect offers an explanation for temporary Q waves observed during myocardial infarction or ischemia.

    Implications:

    • This finding could clarify the mechanism behind transient precordial Q waves in myocardial infarction.
    • It may also explain the presence of fixed Q waves in some patients without evidence of septal infarction at autopsy.

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