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Cortical ischemia: effect upon direct cortical response.

S Yamagata, L P Carter, R Erspamer

    Stroke
    |September 1, 1982
    PubMed
    Summary
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    Cortical blood flow (CBFp) directly impacts the direct cortical response (DCR) during global ischemia. Reduced CBFp levels below critical thresholds lead to DCR loss, with recovery depending on flow rates and duration.

    Area of Science:

    • Neuroscience
    • Cerebrovascular Physiology

    Background:

    • Global ischemia poses a significant threat to brain function.
    • Understanding the relationship between blood flow and neuronal activity is crucial for developing effective treatments.

    Purpose of the Study:

    • To correlate cortical blood flow (CBFp) with the direct cortical response (DCR) in a feline model of global ischemia.
    • To determine critical CBFp thresholds for DCR attenuation and loss.
    • To investigate the impact of ischemia duration and severity on DCR recovery.

    Main Methods:

    • 48 lightly anesthetized cats underwent global ischemia.
    • Cortical blood flow was measured using a thermal diffusion flow probe (CBFp).
    • Direct cortical response (DCR) was monitored to assess neuronal electrical activity.

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    Main Results:

    • DCR attenuation and loss thresholds were identified at specific CBFp levels (21.3 +/- 4.7, 8.7, and 3.4 ml/100 g/min).
    • Abrupt ischemia with CBFp of 0-3 ml/100 g/min caused rapid DCR absence (≤6 min).
    • DCR recovery was unlikely after prolonged periods at low CBFp, but possible at higher flows.
    • Gradual ischemia demonstrated detrimental effects on DCR recovery if flow was <20 ml/100 g/min for >60 min.

    Conclusions:

    • CBFp is a critical determinant of DCR integrity and recovery during global ischemia.
    • The duration and severity of reduced blood flow significantly influence the potential for neuronal recovery.
    • Evidence suggests potential cortical adaptability to ischemic conditions.