What type of study is this?

This is a Quantitative Study study.

September 17, 2025

Anesthetics Modulate Cerebrospinal Fluid Efflux Pathways in Mice by Changing the Perineural and Perivascular Spaces

Key Points

Isoflurane significantly accelerates cerebrospinal fluid outflow through the nasopharyngeal lymphatic plexus but slows it through the paraspinal space.
Ketamine/xylazine significantly retards cerebrospinal fluid outflow compared to dexmedetomidine and isoflurane in the jugular ganglion.
Dynamic contrast-enhanced MRI and structure MRIs were used to assess cerebrospinal fluid dynamics under different anesthetic protocols in mice.
Understanding the effects of anesthesia on cerebrospinal fluid drainage pathways could have broader implications for neurofluid circulation studies.

Abstract

Motivation: Anesthesia could affect neurofluid circulation, but its impact on cerebrospinal fluid (CSF) drainage remains unclear. Goal(s): We aimed to clarify the detailed CSF efflux pathways from the brain to the periphery under different anesthetics. Approach: We performed dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) and structure MRIs in mice under three anesthesia protocols (isoflurane alone (ISO), isoflurane plus dexmedetomidine (DEXI), and ketamine/xylazine (K/X)). Results: ISO significantly accelerates CSF outflow via the nasopharyngeal lymphatic plexus but slows it through the paraspinal space compared to DEXI and K/X. For the jugular ganglion, K/X significantly retards CSF outflow relative to DEXI and ISO. Impact: Different anesthesia protocols could affect the CSF outflow pathways, and the CSF volume changes under different anesthesia protocols are the potential mechanism.

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