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Cerebral microembolization. I. Pathophysiological studies

W M Vise, F Schuier, K A Hossmann

    Archives of Neurology
    |November 1, 1977
    PubMed
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    Brain embolization using carbonized microspheres rapidly increased intracranial pressure in cats. This led to functional suppression of brain activity, reduced oxygen and glucose extraction, and subsequent brain edema and ischemia.

    Area of Science:

    • Neurology
    • Neurosurgery
    • Cerebrovascular Research

    Background:

    • Unilateral cerebral embolization is a model for studying cerebrovascular events.
    • Understanding the immediate and evolving effects of embolization is crucial for neuroprotection strategies.

    Purpose of the Study:

    • To investigate the acute effects of unilateral brain embolization on intracranial pressure, cerebral blood flow, and brain metabolism in a feline model.

    Main Methods:

    • Cats underwent unilateral embolization via intracarotid injection of carbonized microspheres.
    • Intracranial pressure, global cerebral blood flow, cortical oxygen tension, and electroencephalogram (EEG) were monitored.
    • Cerebral arteriovenous oxygen and glucose differences were measured.

    Main Results:

    Related Experiment Videos

    • Embolization caused a rapid increase in intracranial pressure and irreversible ipsilateral EEG flattening within seconds.
    • Initially, global cerebral blood flow and cortical oxygen tension were unaffected, but oxygen and glucose extraction decreased.
    • Severe vasogenic brain edema, secondary ischemia, and profound functional suppression developed within hours.

    Conclusions:

    • Unilateral brain embolization triggers rapid intracranial hypertension and functional brain suppression.
    • The observed metabolic changes suggest impaired neuronal energy metabolism despite preserved initial global blood flow.
    • This model demonstrates a cascade of events leading to brain edema and ischemia following embolization.