Brain FDG-PET correlates of saccadic disorders in early PSP

Area of Science:

• Neuroscience
• Neurology
• Medical Imaging

Background:

• New diagnostic criteria for Progressive Supranuclear Palsy (PSP) emphasize early-stage Eye Movement Records (EMR).
• Ocular motor dysfunction is a key feature in early PSP, necessitating advanced diagnostic tools.

Purpose of the Study:

• To investigate the brain's metabolic correlates of ocular motor dysfunction in early PSP.
• Utilize [18F] Fluorodeoxyglucose Positron Emission Tomography (FDG-PET) to map metabolic changes associated with eye movement abnormalities in PSP.

Main Methods:

• Retrospective observational study of patients with suggestive or possible PSP.
• Combined Eye Movement Records (EMR) and FDG-PET data for correlation analysis.
• Statistical Parametric Mapping (SPM) used for whole-brain voxel-based correlations.

Main Results:

• Decreased vertical saccade gain correlated with reduced metabolism in the Superior Colliculi (SC).
• Increased horizontal saccade velocity correlated with SC and dorsal pons metabolism.
• Delayed horizontal saccade latencies correlated with decreased posterior parietal metabolism.

Conclusions:

• The Superior Colliculi (SC) are early involved in saccadic dysfunction in Progressive Supranuclear Palsy (PSP).
• FDG-PET reveals specific metabolic patterns linked to distinct ocular motor deficits in early PSP.