DTI-ALPS MRI Links Reduced Glymphatic Clearance to Sleep and Cognitive Symptoms in ME/CFS

Griffith University researchers applied diffusion tensor imaging along perivascular spaces (DTI-ALPS) to quantify glymphatic function in ME/CFS. The index captures water diffusivity in projection and association fibers adjacent to perivascular spaces, a proxy validated in neurodegenerative cohorts. Reduced values imply slower clearance of interstitial solutes during sleep, consistent with reported neuroinflammation.

No numeric thresholds or effect sizes appear in the press release, limiting direct comparison to prior DTI-ALPS studies in Alzheimer disease or idiopathic hypersomnia. The design is cross-sectional; reverse causation from chronic sleep fragmentation or deconditioning cannot be excluded. Absence of simultaneous CSF or PET clearance measures leaves the imaging marker unanchored to physiologic rates.

If replicated in larger, longitudinal cohorts with objective actigraphy and serial imaging, DTI-ALPS could serve as a mechanistic stratification tool rather than a diagnostic test. Regulatory and funding bodies will require demonstration that clearance improvement tracks clinical benefit before considering it a therapeutic target.