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Related Experiment Videos

Pulmonary circulation in the reindeer

J Timisjärvi, L Hirvonen

    Basic Research in Cardiology
    |September 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Reindeer heart pressures and oxygen levels change with position and hypoxemia. Prone positioning shows lower heart rates and pressures compared to lateral positions, impacting cardiovascular function.

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    Area of Science:

    • Veterinary Cardiology
    • Physiology

    Background:

    • Understanding cardiovascular parameters in reindeer is crucial for assessing their health.
    • Positional changes and physiological stressors like hypoxemia can significantly affect cardiopulmonary function.

    Purpose of the Study:

    • To investigate the effects of positional changes and hypoxemia on hemodynamic parameters in reindeer.
    • To establish baseline cardiovascular data for reindeer under different conditions.

    Main Methods:

    • Right heart catheterization was performed in 25 reindeer across 56 sessions.
    • Measurements included blood pressure, oxygen saturation, and cardiac output (calculated via cineangiocardiograms).
    • Hemodynamic data were recorded in both prone and lateral positions, and during induced hypoxemia.

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    Main Results:

    • In prone position: heart rate ~50/min, mixed venous oxygen saturation 68-72%, right ventricular systolic pressure ~27 mmHg, pulmonary arterial pressure ~25/16/11 mmHg.
    • In lateral position: heart rate increased to ~90/min, oxygen saturation decreased ~4%, pressures increased ~10 mmHg.
    • Hypoxemia increased heart rate, cardiac output, and pulmonary arterial pressure, with cardiac output and pulmonary arterial pressure correlating with heart rate increases.

    Conclusions:

    • Positional changes significantly alter reindeer cardiovascular parameters, with lateral positioning inducing higher heart rates and pressures.
    • Hypoxemia triggers compensatory cardiovascular responses, including increased cardiac output and pulmonary arterial pressure.
    • Pulmonary vascular resistance increases with elevated pulmonary arterial pressure under these experimental conditions.