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Related Experiment Videos

Myofibrillar disarray produced in normal hearts by chronic electrical pacing.

G E Adomian, J Beazell

    American Heart Journal
    |July 1, 1986
    PubMed
    Summary

    Altering the heart's electrical sequence (depolarization) can change contraction patterns, leading to myofibrillar disarray. This study demonstrates that abnormal stress vectors, caused by altered depolarization, can induce this disarray in normal hearts.

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    Area of Science:

    • Cardiology
    • Cardiac Electrophysiology
    • Heart Muscle Biology

    Background:

    • Myofibrillar disarray is a common finding in various cardiac conditions.
    • The underlying mechanisms causing myofibrillar disarray are not fully understood.
    • A potential common factor involves alterations in myocardial stress vectors.

    Purpose of the Study:

    • To investigate if altering myocardial stress vectors can induce myofibrillar disarray in a normal heart.
    • To test the hypothesis that abnormal stress vectors are a common denominator in myofibrillar disarray development.

    Main Methods:

    • Induced complete atrioventricular block in 12 normal dogs.
    • Utilized electronic pacing of the right ventricular apex at 70 bpm for 3 months.
    • Examined myocardial tissue samples for myofibrillar disarray and compared with 12 control dogs.

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    Main Results:

    • Myofibrillar disarray was observed in 9 out of 12 paced dogs.
    • No myofibrillar disarray was found in the 12 control dogs.
    • The results indicate a link between altered depolarization sequence and myofibrillar disarray.

    Conclusions:

    • Abnormal stress vectors, resulting from altered depolarization and contraction patterns, can produce myofibrillar disarray.
    • This finding offers a unifying concept for understanding myofibrillar disarray across diverse cardiac conditions.
    • Altered cardiac electrical activity can directly impact myocardial structure.