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Related Experiment Videos

Cardiac function, fiber shortening, and dynamic geometry.

R M Heethaar, C R Mol, K Elshuraydeh

    Mayo Clinic Proceedings
    |July 1, 1982
    PubMed
    Summary
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    Accurate cardiac geometry measurement is vital for understanding heart pump function. This study introduces new ultrasound and X-ray techniques to dynamically measure canine heart dimensions and deformations, revealing regional contraction patterns.

    Area of Science:

    • Cardiovascular Physiology
    • Biomedical Engineering
    • Medical Imaging

    Background:

    • Accurate cardiac geometry is crucial for modeling heart pump function.
    • Previous models relied on simplified geometries due to limitations in measurement techniques.
    • Dynamic, detailed dimensional data of the working heart has been lacking.

    Purpose of the Study:

    • To present novel methods for measuring the dynamic geometry of the working canine heart.
    • To quantify cardiac dimensions, intramural deformations, and fiber shortening in situ.
    • To analyze regional contraction and relaxation patterns throughout the cardiac cycle.

    Main Methods:

    • Utilized ultrasound-velocity tomography for dynamic geometry measurement of isolated canine hearts.
    • Employed implanted radiopaque markers and biplane roentgen techniques for in situ measurements.

    Related Experiment Videos

  • Measured cardiac dimensions, intramural deformations, and fiber shortening dynamically.

    • Main Results:

    • Successfully measured dynamic cardiac geometry and intramural deformations in canine hearts.
    • Presented detailed regional contraction and relaxation patterns.
    • Computed epicardial fiber shortening, demonstrating dependence on the preceding RR interval.

    Conclusions:

    • The developed techniques provide accurate dynamic measurements of cardiac geometry and function.
    • These methods enable a more precise understanding of the heart's pump mechanism.
    • Findings highlight the influence of cardiac cycle dynamics on myocardial deformation.