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Systemic arterial hemodynamics in the diamond python Morelia spilotes

A P Avolio, M F O'Rourke, B T Bulliman

    The American Journal of Physiology
    |September 1, 1982
    PubMed
    Summary
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    Snake body shape influences blood flow dynamics. Their long, tapered bodies lead to widespread wave reflections, altering impedance and pulse wave patterns unlike in other animals.

    Area of Science:

    • Comparative physiology
    • Cardiovascular hemodynamics
    • Herpetology

    Background:

    • Systemic arterial hemodynamics exhibit complex patterns influenced by body morphology.
    • Understanding wave propagation and reflection is crucial for cardiovascular research.

    Purpose of the Study:

    • To investigate the impact of snake body shape on pulsatile systemic arterial hemodynamics.
    • To test the hypothesis that body shape determines impedance patterns and pulse wave contour via peripheral reflecting sites.

    Main Methods:

    • Hemodynamic studies were conducted in 10 diamond python snakes.
    • Analysis of pulsatile flow and pressure waves in systemic arteries.
    • Assessment of impedance patterns and wave reflection sites.

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    Main Results:

    • Aortic root flow patterns were similar to mammals, but other arteries showed minimal contour changes.
    • Pressure wave contour was uniform across systemic arteries, lacking secondary diastolic waves.
    • Impedance patterns lacked fluctuations from discrete wave reflections; proximal reflection was minimal.

    Conclusions:

    • Snake body shape, characterized by a long and tapered form, results in widely distributed peripheral reflecting sites.
    • This distribution significantly influences impedance patterns and pulse wave contour, differing from other vertebrates.
    • Findings support the hypothesis that body shape is a key determinant of hemodynamic patterns.