Essential tremor: clinical correlates in 350 patients

Area of Science:

• Neurology
• Movement Disorders
• Clinical Neuroscience

Background:

• Essential tremor (ET) is a common neurological disorder characterized by involuntary rhythmic shaking.
• Understanding the demographic and clinical features of ET is crucial for diagnosis and management.

Purpose of the Study:

• To investigate the demographic and clinical correlates of essential tremor (ET).
• To explore associations between ET subtypes, familial vs. sporadic forms, and treatment responses.

Main Methods:

• Analysis of a database of 350 patients with essential tremor evaluated between 1982 and 1989.
• Assessment of age at onset, tremor distribution, associated conditions (dystonia, parkinsonism), family history, and response to alcohol and medications (propranolol, primidone).

Main Results:

• ET onset showed bimodal distribution (2nd and 6th decades); hands were the most frequently affected site.
• Associated dystonia (47%) and parkinsonism (20%) were common. Familial ET was reported in 62.5% of patients.
• Alcohol relieved tremor in 2/3 of patients. Propranolol and primidone showed significant improvement in 68% and 72% of patients, respectively.
• Early-onset ET correlated with hand involvement and dystonia. Dystonia was more frequent in mild ET. Low-frequency tremor was associated with older age and head involvement.

Conclusions:

• Essential tremor exhibits variable clinical expression but likely represents a single disease entity.
• Demographic and clinical factors, including age at onset and tremor frequency, influence symptom presentation.
• Pharmacological interventions like propranolol and primidone are effective in managing essential tremor symptoms.