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Myocardial function during acute hypoxia in the calf.

D D Buss, G E Bisgard

    Basic Research in Cardiology
    |September 1, 1976
    PubMed
    Summary
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    Acute hypoxia in calves impacts hemodynamics and left ventricular contractility, with the adrenergic system playing a key role. Beta-blockade alters these cardiovascular responses to hypoxia.

    Area of Science:

    • Cardiovascular Physiology
    • Respiratory Physiology

    Background:

    • Understanding the cardiovascular adjustments to acute hypoxia is crucial for managing respiratory distress.
    • The role of the autonomic nervous system in mediating these responses requires further elucidation.

    Purpose of the Study:

    • To investigate the effects of hypocapnic and isocapnic hypoxia on hemodynamics and myocardial contractility in unanesthetized calves.
    • To determine the influence of beta-adrenergic blockade on these cardiovascular responses during hypoxia.

    Main Methods:

    • Hemodynamic parameters and myocardial contractility indices were measured in five unanesthetized calves.
    • Experiments involved acute hypocapnic hypoxia, isocapnic hypoxia, and hypocapnic hypoxia with beta-adrenergic blockade.

    Main Results:

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    • Both hypocapnic and isocapnic hypoxia decreased stroke volume but maintained cardiac output via increased heart rate.
    • Left ventricular contractility was augmented during hypoxia, an effect abolished by beta-adrenergic blockade.
    • Pulmonary arterial pressure increased significantly, and beta-blockade augmented this hypoxic pulmonary pressor response.

    Conclusions:

    • The adrenergic nervous system significantly contributes to the cardiovascular adjustments during acute hypoxia in calves.
    • The autonomic nervous system modulates the pulmonary pressor response to hypoxia in this species.