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[Ventricular activation process and interventricular septal motion].

H Hishida, T Kondo

    Journal of Cardiography. Supplement
    |January 1, 1984
    PubMed
    Summary
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    Investigating abnormal interventricular septum (IVS) motion using echocardiograms (ECHO) in pacemaker patients revealed distinct movement patterns during altered ventricular activation. These findings clarify how cardiac conduction abnormalities affect septal dynamics.

    Area of Science:

    • Cardiology
    • Biomedical Engineering
    • Physiology

    Context:

    • Altered ventricular activation, often due to conditions like sick sinus syndrome or atrioventricular block, can lead to abnormal heart mechanics.
    • Artificial pacemakers are used to manage these conduction abnormalities, providing a model to study their impact on cardiac function.

    Purpose:

    • To investigate the mechanism of abnormal interventricular septum (IVS) motion during altered ventricular activation using M-mode echocardiography (ECHO).
    • To correlate electrocardiogram (ECG) patterns with observed IVS motion in patients with pacemakers.

    Summary:

    • M-mode echocardiograms (ECHO) were used to study 37 pacemaker patients with various ECG classifications (LBBB, S, RBBB types).
    • Two characteristic IVS motion patterns were observed: rapid posterior-then-anterior movement (hump) during pre-ejection and anterior displacement or akinesis during ejection.

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  • The study confirmed assumptions about excitation propagation based on ECG patterns and linked them to observed septal motion.

    • Impact:

    • Provides insights into the mechanical consequences of altered cardiac electrical activation on interventricular septum dynamics.
    • Enhances understanding of echocardiographic findings in patients with cardiac conduction abnormalities and pacemaker dependency.
    • Contributes to the diagnostic capabilities of echocardiography in evaluating complex cardiac conditions.