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Peristaltic flow in the glymphatic system.

Francesco Romanò1, Vinod Suresh2, Peter A Galie3

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Cerebrospinal fluid (CSF) flow into the brain via perivascular spaces (PVS) is modeled. Brain tissue properties like rigidity and permeability significantly influence this flow, which is driven by arterial peristalsis.

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Area of Science:

  • Fluid dynamics
  • Neuroscience
  • Biophysics

Background:

  • The perivascular space (PVS) facilitates cerebrospinal fluid (CSF) transport within the brain.
  • Understanding CSF dynamics is crucial for brain health and waste clearance.

Purpose of the Study:

  • To model and analyze CSF flow into the brain through the PVS.
  • To investigate the influence of arterial peristalsis and brain tissue properties on this flow.

Main Methods:

  • A first-principles approach was used to model PVS flow.
  • Lubrication theory was applied to the annular gap between the artery and brain tissue.
  • Numerical methods solved the perivascular flow model, incorporating arterial peristalsis and Hooke's law for brain elasticity.

Main Results:

  • Peristaltic waves in the artery induce steady streaming of CSF into or out of the brain.
  • This streaming is highly dependent on brain tissue rigidity and permeability.
  • Through flow velocity across the glial boundary was quantified for various physiological conditions.

Conclusions:

  • Arterial peristalsis drives a significant component of CSF through flow in the PVS.
  • Brain tissue elasticity and permeability are key determinants of CSF transport direction and magnitude.
  • The study quantifies CSF flow velocities in the PVS, revealing rates on the order of micrometers per second.