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Cerebrospinal fluid transients induced by hypercapnia.

M J Fisher, S R Heisey, T Adams

    The American Journal of Physiology
    |November 1, 1983
    PubMed
    Summary

    Hypercapnia temporarily increases cerebrospinal fluid (CSF) outflow but reduces tracer concentration. Incomplete mixing in CSF spaces means unequilibrated CSF significantly impacts tracer dilution during hypercapnia.

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    Area of Science:

    • Neuroscience
    • Physiology
    • Fluid Dynamics

    Background:

    • Hypercapnia transiently increases cerebrospinal fluid (CSF) outflow rate (Vd) and decreases tracer concentration (CSFtf).
    • This dilution effect is hypothesized to result from increased CSF formation rate (Vf) or displacement of unequilibrated CSF from poorly mixed compartments.
    • Understanding CSF dynamics is crucial for interpreting tracer studies and physiological responses.

    Purpose of the Study:

    • To investigate the contribution of unequilibrated CSF to tracer dilution during hypercapnia.
    • To assess the impact of altered CSF mixing on the interpretation of ventriculocisternal perfusion studies.
    • To determine if CSF formation rate (Vf) increases with CO2 breathing or other craniospinal fluid redistribution events.

    Main Methods:

    • Utilized a "stop-flow" procedure in anesthetized cats during ventriculocisternal perfusion with mock CSF containing [14C]dextran.
    • Administered spontaneous air breathing followed by 5% CO2 inhalation, both before and after the stop-flow procedure.
    • Monitored CSF outflow rate (Vd), tracer-free CSF (CSFtf) concentration, and CSF formation rate (Vf).

    Main Results:

    • The stop-flow procedure did not affect Vd or the timeframes for Vd and CSFtf measurements.
    • CSFtf concentration significantly decreased by 50% after the stop-flow procedure.
    • This indicates that unequilibrated CSF sequestered in poorly mixed compartments significantly contributes to tracer dilution.

    Conclusions:

    • Cerebrospinal fluid mixing is incomplete within the subarachnoid spaces during ventriculocisternal perfusion.
    • Unequilibrated CSF plays a substantial role in the reduced tracer concentration observed during acute hypercapnia.
    • Verification of CSF space homogeneity is essential for accurately determining Vf changes in response to CO2 or other perturbations.

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