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Decreased Craniocervical CSF Flow in Patients with Normal Pressure Hydrocephalus: A Pilot Study.

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Patients with normal pressure hydrocephalus exhibit reduced systolic cerebrospinal fluid (CSF) flow rates. This finding may indicate impaired spinal CSF spaces and supports CSF flow rate measurement as a diagnostic tool.

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Area of Science:

  • Neurology
  • Radiology
  • Biophysics

Background:

  • Normal pressure hydrocephalus (NPH) is associated with elevated intracranial pressure, potentially due to reduced spinal cerebrospinal fluid (CSF) space compliance.
  • This reduced compliance may manifest as diminished cervical CSF outflow, impacting the cranial CSF buffer function.

Purpose of the Study:

  • To investigate craniospinal CSF flow rates using phase-contrast MR imaging in patients diagnosed with NPH.
  • To compare CSF flow dynamics between NPH patients and healthy control groups to identify potential diagnostic markers.

Main Methods:

  • A prospective study included 42 participants: 10 NPH patients, 18 age-matched healthy controls, and 14 young healthy controls.
  • Axial phase-contrast MR imaging was employed to measure maximal systolic CSF and total arterial blood flow rates at the upper cervical vertebra (C2).

Main Results:

  • Maximal systolic CSF flow rate was significantly lower in NPH patients compared to both age-matched and young healthy controls (P < .01).
  • No significant differences were observed in maximal systolic arterial blood flow rates among the study groups (P > .05).

Conclusions:

  • Reduced maximal systolic craniospinal CSF flow rates in NPH patients likely reflect decreased spinal CSF space compliance and ineffective spinal CSF buffering.
  • Systolic craniospinal CSF flow rate is a readily measurable MR imaging parameter that can aid in the diagnosis of NPH.