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Related Experiment Videos

Effect of posture on extradural pressure.

J L Shah

    British Journal of Anaesthesia
    |December 1, 1984
    PubMed
    Summary

    Extradural pressure, measured in pregnant and non-pregnant patients, was higher in the supine position than the lateral position. This physiological difference in extradural pressure is likely due to cerebrospinal fluid pressure changes.

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    Area of Science:

    • Anesthesiology
    • Physiology
    • Obstetrics

    Background:

    • Understanding extradural pressure dynamics is crucial for anesthetic procedures.
    • Positional changes can influence physiological pressures within the body.

    Purpose of the Study:

    • To measure and compare extradural pressure in lateral and supine positions across different patient groups.
    • To investigate the physiological basis of extradural pressure variations with posture.

    Main Methods:

    • Extradural pressure was measured using an extradural catheter as a manometer.
    • Measurements were taken in lateral and supine positions in pregnant, postpartum, and male surgical patients.
    • Further measurements were conducted in the prone position for a subset of pregnant patients.

    Main Results:

    • Extradural pressure was consistently higher in the supine position compared to the lateral position across all patient groups.
    • Mean extradural pressures in both positions were similar among the three studied groups.
    • The observed pressure difference was independent of vena caval compression.

    Conclusions:

    • The postural difference in extradural pressure is a physiological phenomenon.
    • Changes in cerebrospinal fluid pressure are the likely drivers of extradural pressure variations with posture.
    • These findings have implications for understanding spinal fluid dynamics and anesthetic management.

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