Clinical Report: Imaging Indicators of Glymphatic Dysfunction in TBM
Overview
This study investigates the relationship between glymphatic function, cognitive performance, and cerebrospinal fluid proteins in patients with tuberculous meningitis (TBM). It identifies imaging markers that correlate with cognitive decline, highlighting the potential of the ALPS index as a biomarker for prognosis.
Background
Tuberculous meningitis (TBM) is a severe central nervous system infection that often leads to cognitive impairment, significantly affecting survivors' quality of life. Understanding the mechanisms behind cognitive decline in TBM is crucial for developing effective interventions. The glymphatic system, responsible for clearing metabolic waste, may play a key role in this cognitive decline, particularly during the early stages of mild cognitive impairment.
Data Highlights
Group
Hippocampal PVS Volume Fraction
ALPS Index
CPV
TBM-MCI
Lower
Lower
Higher
TBM-nonMCI
Lower
Higher
Higher
Healthy Controls
Normal
Normal
Normal
Key Findings
All TBM patients exhibited smaller hippocampal PVS volume fraction and larger CPV compared to healthy controls.
The TBM-MCI group showed lower ALPS indices and higher basal ganglia PVS.
ALPS indices positively correlated with cognitive measures such as SDMT and MMSE.
The right CPV fully mediated the relationship between the right ALPS-MMSE and the right ALPS index.
The left ALPS index predicted cognitive prognosis over 6 to 12 months with an AUC of 0.857.
Clinical Implications
The findings suggest that imaging markers of glymphatic dysfunction can serve as valuable tools for assessing cognitive decline in TBM patients. Clinicians should consider incorporating ALPS indices into cognitive assessments to better predict outcomes and tailor interventions.
Conclusion
This study underscores the importance of glymphatic function in cognitive decline associated with tuberculous meningitis, positioning the ALPS index as a promising biomarker for prognosis and cognitive dysfunction.
