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[Cerebral hemodynamics in chronic hypoxic hypoxia].

K Aritake, H M Mayer, E Fritschka

    No to Shinkei = Brain and Nerve
    |April 1, 1986
    PubMed
    Summary

    Chronic hypoxic hypoxia increases cerebral blood flow and cardiac output in cats, even after returning to normal oxygen levels. Autoregulation of cerebral blood flow appears partially preserved despite long-term low oxygen exposure.

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    Area of Science:

    • Physiology
    • Cardiovascular Research
    • Neuroscience

    Background:

    • Chronic hypoxia is a condition characterized by prolonged exposure to low oxygen levels.
    • Understanding its effects on the brain's blood supply is crucial for managing related health issues.

    Purpose of the Study:

    • To investigate the impact of chronic hypoxic hypoxia on cerebral blood flow (CBF) and its regulatory mechanisms.
    • To assess the responsiveness of CBF to changes in systemic arterial pressure (SAP) and arterial oxygen tension (PaO2) in hypoxia-adapted animals.

    Main Methods:

    • Adult cats were exposed to gradually decreasing oxygen concentrations for 4.5 months.
    • Radioactively labeled microspheres were used for intracardiac injection to measure blood flow.
    • CBF was measured under normoxic normotension, hypoxic normotension, and normoxic hypotension.

    Main Results:

    • Chronic hypoxic hypoxia led to a sustained increase in cerebral blood flow, persisting even in normoxia.
    • Hematocrit increased to 56%, and cardiac output was elevated in hypoxia-adapted animals.
    • While CBF decreased under hemorrhagic hypotension, it did not fall below control levels, suggesting preserved autoregulation.

    Conclusions:

    • Long-term exposure to hypoxic hypoxia increases cerebral blood flow and cardiac output.
    • Cerebral blood flow autoregulation may be partially maintained even after prolonged, graded hypoxic exposure.
    • Changes in cardiac output and blood viscosity likely influence CBF during hypotension in adapted animals.

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