Frontal functions in young patients with essential tremor: a case comparison study

Area of Science:

• Neurology
• Neuroscience

Background:

• Essential tremor (ET) is primarily classified as a motor system disease.
• Previous research suggests potential links between ET and cognitive impairments.
• Understanding these cognitive aspects is crucial for a comprehensive view of ET.

Purpose of the Study:

• To assess cognitive functions in a young ET patient cohort compared to controls.
• To investigate correlations between tremor severity, regional cerebral blood flow (rCBF), and neuropsychological performance.
• To explore the potential role of the cerebello-thalamo-frontal network in ET.

Main Methods:

• A comprehensive neuropsychological test battery was administered to 16 ET patients and 16 controls.
• Regional cerebral blood flow (rCBF) was measured using technetium-99m-HMPAO SPECT in a subset of participants.
• Tremor severity was quantified using the Clinical Rating Scale for Tremor (CRST).

Main Results:

• ET patients demonstrated significant deficits in visuospatial functions and verbal memory compared to controls.
• No significant differences in rCBF were observed between ET patients and controls.
• A significant inverse correlation was found between tremor severity and executive functions.
• Tremor severity also showed an inverse correlation with bilateral frontal blood flow.

Conclusions:

• Subclinical cognitive deficits, including visuospatial and verbal memory impairments and executive dysfunction, may be characteristic of ET.
• The findings suggest the involvement of the cerebello-thalamo-frontal network in the pathophysiology of Essential Tremor.