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Intracranial pressure elevation alters CSF clearance pathways.

Vegard Vinje1, Anders Eklund2, Kent-Andre Mardal3,4

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Infusion tests for normal pressure hydrocephalus reveal that cerebrospinal fluid (CSF) outflow pathways shift with increasing intracranial pressure (ICP). The glymphatic system

Keywords:
CSF circulationCSF dynamicsGlymphatic pathwayInfusion testIntracranial pressureParavascular flow

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Area of Science:

  • Neuroscience and Biomedical Engineering
  • Cerebrospinal Fluid Dynamics
  • Hydrocephalus Pathophysiology

Background:

  • Infusion testing is standard for assessing shunt efficacy in normal pressure hydrocephalus (NPH).
  • Traditional mathematical models describe cerebrospinal fluid (CSF) circulation but may not fully incorporate newer pathways.
  • The role of the glymphatic or paravascular pathway in CSF dynamics during infusion tests requires investigation.

Purpose of the Study:

  • To evaluate how the glymphatic/paravascular pathway influences traditional mathematical models of CSF circulation during infusion tests.
  • To quantify the contribution of different outflow pathways under varying intracranial pressure (ICP) conditions.

Main Methods:

  • A compartment model was utilized to estimate pressures within subarachnoid and paravascular spaces.
  • Resistances for arachnoid granulations, cribriform plate, and glymphatic circulation were calculated.
  • Model variations were tested to assess parameter sensitivity during simulated infusion tests.

Main Results:

  • At baseline ICP, CSF outflow was 60% via arachnoid granulations and 40% via the cribriform plate, with minimal paravascular flow.
  • During infusion, outflow shifted to 80% arachnoid granulations and 20% cribriform plate, with stagnant paravascular space (PVS) flow.
  • Glymphatic system resistance was calculated as 2.73 mmHg/(mL/min), suggesting it's too low for arterial pulsation-driven flow and too high for direct lymphatic drainage.

Conclusions:

  • CSF outflow distribution is ICP-dependent, with arachnoid granulations being the primary clearance route.
  • ICP changes significantly impact the pathways for substances injected into the subarachnoid space.
  • The glymphatic system's resistance appears to preclude significant pressure-driven flow or direct PVS-to-lymphatic drainage.