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Cardiac performance in hemorrhagic shock.

S E Downing

    Texas Reports on Biology and Medicine
    |January 1, 1979
    PubMed
    Summary

    Hemorrhagic shock causes cardiac dysfunction and circulatory collapse. Maintaining coronary perfusion pressure prevents heart damage, but oxygen deprivation, acidosis, and adrenergic failure contribute to irreversible failure.

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    Area of Science:

    • Cardiovascular Physiology
    • Hemorrhagic Shock Research
    • Critical Care Medicine

    Background:

    • Circulatory collapse following severe blood loss is a critical medical emergency.
    • The specific organ systems initiating irreversible shock remain debated.
    • Cardiac performance decline is recognized in prolonged hypotension, but its role is unclear.

    Purpose of the Study:

    • To investigate the role of cardiac performance in irreversible hemorrhagic shock.
    • To identify key mechanisms contributing to cardiac dysfunction during shock.
    • To evaluate the impact of coronary perfusion pressure on cardiac function.

    Main Methods:

    • Utilized ventricular function curves to assess left ventricular (LV) pump function.
    • Maintained a pre-determined arterial pressure (AP) of 30 mmHg during hemorrhagic shock.
    • Manipulated arterial pressure and coronary perfusion pressure (CPP) to observe effects on LV performance.

    Main Results:

    • Progressive decline in stroke volume observed at a fixed LV end-diastolic pressure during shock.
    • Sustained hypotension (2 hours) led to persistent LV depression post-pressure re-elevation.
    • Maintaining normotensive CPP prevented LV depression, while low myocardial O2 availability (<10 ml/min/100 gm) caused cardiac failure.

    Conclusions:

    • Coronary perfusion pressure is pivotal in preventing cardiac deterioration during hemorrhagic shock.
    • Reduced oxygen availability, metabolic acidosis, and adrenergic failure are major determinants of cardiac dysfunction.
    • These factors likely contribute to irreversible circulatory collapse by impairing myocardial aerobic metabolism and contractility.

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