An Experimental Investigation of Oscillatory Flow in the Cerebral Aqueduct

Overview

Journal Eur J Mech B Fluids

Publisher Elsevier

Date 2024 May 21

PMID 38770034

Authors

S Sincomb

F Moral-Pulido

O Campos

C Martinez-Bazan

V Haughton

A L Sanchez

Affiliations

Soon will be listed here.

Abstract

This study aims at clarifying the relation between the oscillatory flow of cerebrospinal fluid (CSF) in the cerebral aqueduct, a narrow conduit connecting the third and fourth ventricles, and the corresponding interventricular pressure difference. Dimensional analysis is used in designing an anatomically correct scaled model of the aqueduct flow, with physical similarity maintained by adjusting the flow frequency and the properties of the working fluid. The time-varying pressure difference across the aqueduct corresponding to a given oscillatory flow rate is measured in parametric ranges covering the range of flow conditions commonly encountered in healthy subjects. Parametric dependences are delineated for the time-averaged pressure fluctuations and for the phase lag between the transaqueductal pressure difference and the flow rate, both having clinical relevance. The results are validated through comparisons with predictions obtained with a previously derived computational model. The parametric quantification in this study enables the derivation of a simple formula for the relation between the transaqueductal pressure and the stroke volume. This relationship can be useful in the quantification of transmantle pressure differences based on non-invasive magnetic-resonance-velocimetry measurements of aqueduct flow for investigation of CSF-related disorders.

Citing Articles

Transmantle pressure under the influence of free breathing: non-invasive quantification of the aqueduct pressure gradient in healthy adults.

Liu P, Owashi K, Monnier H, Metanbou S, Capel C, Baledent O Fluids Barriers CNS. 2025; 22(1):1.

PMID: 39754238 PMC: 11697896. DOI: 10.1186/s12987-024-00612-x.

Quantifying CSF Dynamics disruption in idiopathic normal pressure hydrocephalus using phase lag between transmantle pressure and volumetric flow rate.

Karki P, Sincomb S, Murphy M, Gunter J, Senjem M, Graff-Radford J Brain Multiphys. 2024; 7.

PMID: 39726610 PMC: 11671130. DOI: 10.1016/j.brain.2024.100101.

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