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Cardiovascular function during sustained +Gz stress

H H Erickson, H Sandler, H L Stone

    Aviation, Space, and Environmental Medicine
    |July 1, 1976
    PubMed
    Summary
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    This study investigated cardiovascular responses to high G-force acceleration in canines, revealing potential mechanisms for arrhythmias and subendocardial hemorrhage during aerospace stress.

    Area of Science:

    • Aerospace Medicine
    • Cardiovascular Physiology
    • Biomedical Engineering

    Background:

    • High positive Gz acceleration poses significant cardiovascular challenges for aerospace systems.
    • Understanding cardiac responses to extreme G-force is crucial for crew safety and system design.

    Purpose of the Study:

    • To elucidate cardiovascular responses to +Gz acceleration using a canine model.
    • To identify mechanisms underlying potential cardiac complications during high-G exposure.

    Main Methods:

    • Instrumentation of canine cardiovascular systems to measure coronary blood flow, cardiac output, and pressures.
    • Exposure to acceleration profiles up to +6 Gz with simulated seatback angles.
    • Radiopaque contrast angiography to visualize cardiac and vascular structures.

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    Main Results:

    • Continuous monitoring revealed significant cardiovascular changes under acceleration stress.
    • Angiographic data provided insights into coronary and ventricular dynamics.
    • Findings suggest potential links between acceleration and cardiac events like arrhythmias.

    Conclusions:

    • The study provides a foundation for understanding cardiac dysfunction during high-G exposure.
    • Results may inform strategies to mitigate cardiovascular risks in aerospace operations.
    • Further research can explore preventative measures against G-induced cardiac injuries.