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Circulatory response to arterial hyperoxia.

Y Cassuto, L E Farhi

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |May 1, 1979
    PubMed
    Summary
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    Hyperoxia (100% O2) increased blood oxygen, but infused animals showed decreased cardiac output and tissue hypoxia. Peripheral responses to hyperoxia depend on factors beyond arterial oxygen levels.

    Area of Science:

    • Physiology
    • Cardiovascular System
    • Respiratory System

    Background:

    • Understanding the circulatory response to hyperoxia is crucial for managing conditions involving high oxygen concentrations.
    • Previous studies have not fully elucidated the peripheral mechanisms influencing cardiac output during hyperoxia, especially with enhanced blood oxygen solubility.

    Purpose of the Study:

    • To investigate the circulatory effects of breathing 100% oxygen at different pressures in unanesthetized rabbits.
    • To determine if increased blood oxygen solubility influences the cardiovascular response to hyperoxia.
    • To identify factors beyond arterial oxygen partial pressure (PO2) that affect peripheral responses to hyperoxia.

    Main Methods:

    • Unanesthetized rabbits were used, with cannulation of systemic arteries and the right heart.

    Related Experiment Videos

  • One group received a fluorocarbon emulsion to increase blood oxygen solubility.
  • Circulatory responses, including arterial PO2, right heart PO2, cardiac output, and blood gases, were monitored during exposure to 100% oxygen at 1 and 3 atm.

    • Main Results:

    • Exposure to 100% oxygen raised arterial PO2 identically in both control and infused groups.
    • Oxygen uptake remained unchanged, but cardiac output decreased over time, more rapidly in infused animals.
    • Infused animals developed lactic acidosis, indicating tissue hypoxia despite high arterial oxygen levels.

    Conclusions:

    • The peripheral circulatory response to hyperoxia is influenced by factors other than arterial PO2.
    • Increased blood oxygen solubility can exacerbate the decrease in cardiac output during hyperoxia.
    • Tissue hypoxia can occur in the presence of arterial hyperoxia, particularly when blood oxygen solubility is enhanced.