Functional Connectivity Changes of Anti-N-Methyl-D-Aspartate Receptor Encephalitis: A Graph-Theoretic and...

Area of Science:

• Neuroscience
• Immunology
• Medical Imaging

Background:

• Anti-N-methyl-D-aspartate receptor (anti-NMDAR) encephalitis is an autoimmune disorder causing neurological, cognitive, and psychological symptoms.
• The underlying neurological mechanisms of anti-NMDAR encephalitis remain largely unknown.

Purpose of the Study:

• To investigate alterations in functional brain networks in patients with anti-NMDAR encephalitis.
• To elucidate potential pathogenic mechanisms contributing to the observed abnormalities.
• To provide insights for developing future therapeutic strategies.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was employed in 35 patients with anti-NMDAR encephalitis and 34 healthy controls.
• Neuropsychological testing was conducted alongside fMRI.
• Graph theory analysis was used to assess topological properties and functional connectivity (FC) of brain networks.

Main Results:

• Patients exhibited decreased functional connectivity between most brain regions, with notable exceptions in the parietal and left frontal lobes.
• Anti-NMDAR encephalitis patients showed increased local and global efficiency and decreased shortest path length compared to controls.
• Specific network changes included elevated lymph node efficiency and degree in the default mode network (DMN) and enhanced efficiency with reduced intermediacy in the subcortical network (SCN).

Conclusions:

• This study provides a comprehensive examination of functional brain network abnormalities in anti-NMDAR encephalitis.
• The findings contribute to a deeper understanding of the neuropathophysiological basis of the disorder.
• Further research into these network alterations may guide therapeutic interventions.