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CSF formation and absorption estimates by constant flow infusion method

E F Vastola

    Archives of Neurology
    |March 1, 1980
    PubMed
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    This study found that low cerebrospinal fluid (CSF) conductance is linked to reduced CSF formation, potentially causing normal pressure hydrocephalus. Low conductance may indicate conditions responsive to shunting.

    Area of Science:

    • Neurosurgery
    • Neurology
    • Physiology

    Background:

    • Cerebrospinal fluid (CSF) dynamics are crucial for brain health.
    • Understanding CSF formation and conductance is vital for diagnosing neurological disorders.
    • Previous studies have offered limited insights into the relationship between CSF formation and conductance.

    Purpose of the Study:

    • To calculate CSF formation rate and conductance in patients with dilated ventricles.
    • To investigate the relationship between CSF conductance and CSF formation.
    • To explore the potential role of underformation in normal pressure hydrocephalus (NPH).

    Main Methods:

    • Utilized the constant-flow infusion method in 54 patients.
    • Measured CSF conductance and formation rates.

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  • Analyzed data from patients with stable clinical conditions and normal CSF pressures.

    • Main Results:

    • CSF conductance values ranged from 0.00203 to 0.0263 mL/min/mm H2O.
    • CSF formation rates varied significantly (0.114 to 3.0 mL/min), with a peak between 0.5 and 1.0 mL/min.
    • Reduced CSF formation was observed in patients with low conductance.

    Conclusions:

    • Low CSF conductance correlates with decreased CSF formation.
    • Underformation and ventricular stagnation may contribute to normal pressure hydrocephalus.
    • Low conductance values could help identify shunt-responsive hydrocephalus syndromes.