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[Spectral analysis of cerebrospinal fluid pulse wave]
No to Shinkei = Brain and Nerve
|December 1, 1983
Summary
Elevated cerebrospinal fluid (CSF) pressure alters CSF pulse wave transmission. The CSF system acts as a high-cut filter, with its cutoff frequency decreasing as pressure rises.
Area of Science:
- Neuroscience
- Biomedical Engineering
- Physiology
Context:
- Continuous intracranial pressure monitoring often reveals changes in cerebrospinal pressure waves.
- These pressure wave alterations are hypothesized to stem from modifications in spinal fluid pulse transmission within the cerebrospinal fluid (CSF) system.
Purpose:
- To investigate how the auto power spectrum of CSF pulse changes when CSF pressure is elevated through slow infusion of lactate Ringer solution.
- To analyze the spectral components of CSF pulse waves and their response to increased intracranial pressure.
Summary:
- The CSF pulse spectrum comprises respiratory, fundamental cardiac, and second/third harmonic waves.
- Elevating CSF pressure increased the power of cardiac-origin waves, with a greater increase in the fundamental wave compared to harmonics.
- Increased CSF pressure led to a relative attenuation of harmonic waves within the CSF pulse.
Impact:
- The study suggests the CSF system functions as a "high-cut filter."
- Slow infusion of lactate Ringer solution lowers the CSF system's cutoff frequency.
- Findings provide insights into the biomechanical properties of the CSF system under varying pressure conditions.