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Related Experiment Videos

"Pressure-volume" relations in isolated cat trabecula

G Elzinga, N Westerhof

    Circulation Research
    |August 1, 1981
    PubMed
    Summary

    Cardiac muscle contraction timing depends on its history. This finding suggests the left ventricle

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    A short history of physiology.

    Acta physiologica (Oxford, England)·2011

    Area of Science:

    • Cardiovascular Physiology
    • Cardiac Mechanics
    • Muscle Physiology

    Background:

    • The left ventricle's time-varying compliance is crucial for cardiac function.
    • Previous studies on canine left ventricles suggested time-varying compliance.
    • Understanding muscle fiber behavior is key to cardiac mechanics.

    Purpose of the Study:

    • To investigate if isolated cat trabecula exhibit time-varying compliance.
    • To compare feline trabecula behavior with canine left ventricular models.
    • To elucidate the mechanisms behind cardiac muscle contraction dynamics.

    Main Methods:

    • Studying isolated cat trabecula under simulated in-vivo conditions.
    • Measuring contraction onset and end-systole timing.
    • Analyzing the influence of contraction history on mechanical properties.

    Main Results:

    • Isolated cat trabecula demonstrated a history-dependent end-systole timing.
    • End-systole duration varied significantly (100-160 ms) based on contraction history.
    • Similar, though less pronounced, history-dependency was observed in intact feline ventricles.

    Conclusions:

    • Cardiac muscle contraction exhibits history-dependent properties.
    • The time-varying compliance of the left ventricle may stem from muscle fiber organization.
    • This challenges the notion that complex ventricular mechanics are solely due to intrinsic muscle properties.

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