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Related Experiment Videos

Vascular hemodynamics: deep rooted misconceptions misnomers.

H S Badeer, R R Rietz

    Cardiology
    |January 1, 1979
    PubMed
    Summary
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    Gravity does not affect blood circulation due to the U-tube principle, as gravitational and venous pressures balance. Therefore, gravitational pressure should be excluded from perfusion pressure calculations in hemodynamics.

    Area of Science:

    • Physiology
    • Cardiovascular System

    Background:

    • Widespread misconceptions exist regarding the influence of gravity on vascular hemodynamics.
    • Vascular pressure is a sum of cardiodynamic and hydrostatic pressures.

    Purpose of the Study:

    • To clarify the role of gravity in blood circulation.
    • To correct the erroneous belief that gravity hinders blood flow and venous return.

    Main Methods:

    • Analysis of the U-tube or siphon principle applied to blood circulation.
    • Review of the components of vascular pressure (cardiodynamic vs. gravitational).

    Main Results:

    • Gravity does not aid or impede circulation because the gravitational energy in arterial and venous blood columns balance.
    • Contrary to common belief, gravity does not hinder cerebral blood flow in upright positions or venous return from lower body parts.

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  • Postural changes in circulation are attributed to vessel distension, particularly in veins, due to altered hydrostatic pressure.

    • Conclusions:

    • Gravitational pressure should be excluded from perfusion pressure in Poiseuille's equation.
    • Understanding the U-tube principle is crucial for accurate hemodynamic analysis, refuting gravity's direct impact on blood flow.
    • Circulatory adjustments to posture are primarily due to venous distension, not gravity's direct effect on flow rate.