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Aortic blood flow during sequential MAST inflation

M Hauswald, E R Greene

    Annals of Emergency Medicine
    |November 1, 1986
    PubMed

    Insights

    Medical antishock trousers significantly reduced blood flow in the aorta by 75% and increased blood pressure by 10% in healthy volunteers. Lower inflation pressures were less effective.

    Area of Science:

    • Physiology
    • Medical Devices
    • Hemodynamics

    Background:

    • Medical antishock trousers (MAST) are used to treat hypotension.
    • The physiological effects of MAST inflation on major blood vessels are not fully understood.

    Purpose of the Study:

    • To investigate the hemodynamic effects of sequential MAST inflation in healthy volunteers.

    Main Methods:

    • Ten healthy volunteers underwent sequential inflation of MAST.
    • Measurements included cardiac output, pulse rate, blood pressure, and distal abdominal aortic blood flow.

    Main Results:

    • Full MAST inflation decreased distal aortic blood flow by 75% (P < .001).
    • Blood pressure increased by 10% (P < .001) with no significant change in cardiac output or pulse rate.
    • Lower inflation pressures demonstrated markedly reduced effectiveness.

    Conclusions:

    • Full inflation of MAST effectively reduces distal aortic blood flow and increases blood pressure.
    • MAST's effectiveness is pressure-dependent, with lower pressures being less impactful.

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