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The pathogenesis of normal pressure hydrocephalus: a theoretical analysis
1Department of Neurology, New York University Medical Center, New York, USA. david.levine@med.nyu.edu
Bulletin of Mathematical Biology
|September 25, 2007
Summary
Normal pressure hydrocephalus involves normal cerebrospinal fluid (CSF) pressure despite fluid buildup. Efficient CSF absorption by brain tissue explains sustained ventricular enlargement in this condition.
Area of Science:
- Neuroscience
- Biophysics
- Medical Physics
Background:
- Hydrocephalus is characterized by abnormal cerebrospinal fluid (CSF) accumulation in cerebral ventricles.
- Often, hydrocephalus presents with normal ventricular CSF pressure (VCSFP) despite impaired CSF absorption.
- The mechanism allowing hydrocephalus with normal VCSFP remains unclear.
Purpose of the Study:
- To investigate the role of brain parenchyma in CSF absorption in hydrocephalus.
- To elucidate how hydrocephalus can manifest with normal VCSFP.
- To test theories regarding CSF dynamics and parenchymal interaction.
Main Methods:
- Modeling the brain as a porous, elastic spherical shell.
- Modifying poroelasticity equations to incorporate parenchymal CSF absorption.
- Calculating steady-state changes in pressure, fluid content, and tissue mechanics under different absorption scenarios.
Main Results:
- Theory 1 (impermeable wall) and Theory 3 (inefficient absorption) did not align with clinical observations.
- Theory 2 (efficient parenchymal absorption) successfully explained sustained ventricular dilatation with normal VCSFP.
- Calculations supported efficient CSF seepage into and absorption by the brain parenchyma.
Conclusions:
- Efficient absorption of cerebrospinal fluid (CSF) by the brain parenchyma is the most plausible explanation for normal pressure hydrocephalus.
- This mechanism accounts for key clinical features, including ventricular enlargement and periventricular white matter damage.
- The study highlights the dynamic role of brain tissue in CSF homeostasis.
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