Higher Prevalence of Common Neurological Soft Signs in Essential Tremor With Midline Distribution: A Multicenter...

Area of Science:

• Neurology
• Movement Disorders
• Clinical Neuroscience

Background:

• Essential tremor (ET) with midline distribution (Mid-ET) may represent a distinct subtype.
• Mid-ET often indicates advanced disease and increased severity.
• Research on neurological soft signs (NSS) in Mid-ET is limited.

Purpose of the Study:

• To investigate the clinical features and NSS prevalence in Mid-ET versus non-midline ET (No-Mid-ET).
• To identify factors associated with Mid-ET.
• To explore potential pathophysiological differences between Mid-ET and No-Mid-ET.

Main Methods:

• Cross-sectional study comparing Mid-ET and No-Mid-ET subgroups.
• Comparative analysis of clinical features and NSS prevalence.
• Statistical analysis to identify associated factors.

Main Results:

• Of 1,160 ET patients, 48.9% had Mid-ET.
• Mid-ET showed significantly higher prevalence of NSS, including cognitive impairment, gait impairment, and dystonic posturing (p<0.001).
• Female sex, olfactory dysfunction, and dystonic posturing were associated with Mid-ET.

Conclusions:

• Mid-ET and No-Mid-ET exhibit significant clinical differences.
• Questionable dystonic posturing may characterize Mid-ET, suggesting distinct pathophysiology.
• Further research is needed to explore the pathophysiological link between NSS and Mid-ET.