Topography of essential tremor

Area of Science:

• Neurology
• Movement Disorders

Background:

• The topographical distribution of tremor in essential tremor (ET) is not well understood.
• Essential tremor commonly affects the hands, but head and voice tremor prevalence and correlates require further investigation.

Purpose of the Study:

• To investigate the prevalence and clinical characteristics of head and/or voice tremor in patients with essential tremor.
• To identify factors associated with the presence and combination of head and voice tremor in ET.

Main Methods:

• Analysis of a prospectively collected registry of 972 ET patients, with 884 included for tremor localization analysis.
• Patients were categorized into four groups based on head and voice tremor presence: none, head only, voice only, and both.
• Demographic and clinical data were compared across subgroups, with logistic regression and meta-analysis employed.

Main Results:

• Prevalence rates were 24.7% for head tremor, 12.4% for voice tremor, and 7.1% for combined head and voice tremor.
• Female gender was strongly associated with head tremor; severe hand tremor correlated with voice tremor.
• Both female gender and severe hand tremor increased the odds of combined head and voice tremor. Patients with both head and voice tremor showed more widespread involvement and poorer response to beta-blockers.

Conclusions:

• Female sex and severe hand tremor are significant predictors for head and/or voice tremor in essential tremor.
• The association between hand tremor severity and midline tremor (head/voice) is more pronounced in males than females.
• Head and voice tremor in ET may indicate a more severe or distinct subtype with broader symptom manifestation.