Structural brain differences in essential tremor and Parkinson's disease deep brain stimulation patients

Area of Science:

• Neuroimaging
• Neurology
• Medical Diagnostics

Background:

• Essential tremor (ET) and Parkinson's disease (PD) are common tremor disorders often requiring deep brain stimulation (DBS).
• Diagnostic challenges arise due to overlapping symptoms between ET and PD.
• Understanding structural brain differences is crucial for accurate differentiation.

Purpose of the Study:

• To identify structural brain differences between patients with ET and PD undergoing DBS.
• To improve the differential diagnosis of ET and PD using neuroimaging.
• To enhance the understanding of brain regions implicated in ET and PD.

Main Methods:

• Observational study including ET and PD patients scheduled for DBS surgery.
• 3T brain MRI acquired under general anesthesia.
• Automated multi-atlas segmentation used for quantifying cortical thickness and subcortical volumes from T1-weighted images.
• Logistic regression analysis employed to identify brain regions associated with ET or PD diagnosis.

Main Results:

• Analysis included 149 ET and 265 PD patients.
• ET diagnosis was associated with smaller pallidum and thalamus volumes and reduced thickness in the anterior orbital, lateral orbital, and medial precentral gyri.
• PD diagnosis was associated with reduced volumes in the caudate, amygdala, putamen, and basal forebrain, and reduced thickness in the inferior frontal gyrus (orbital part), supramarginal gyrus, and posterior cingulate.

Conclusions:

• Distinct structural brain differences exist between ET and PD patients.
• Findings suggest that structural MRI can aid in differentiating between ET and PD.
• This research expands knowledge of the specific brain regions involved in these distinct tremor disorders.