The overlap between Essential tremor and Parkinson disease

Area of Science:

• Neurology
• Movement Disorders

Background:

• Essential tremor (ET) and Parkinson's disease (PD) are prevalent in aging populations.
• These disorders present overlapping clinical features, challenging differential diagnosis.
• A pathophysiological link between ET and PD has been previously suggested.

Purpose of the Study:

• To review current evidence regarding the relationship between ET and PD.
• To examine recent advances in tremor pathophysiology and nosology.

Main Methods:

• Systematic review of existing literature.
• Analysis of evidence supporting or refuting a link between ET and PD.

Main Results:

• Subtyping ET into early-onset and late-onset may aid in understanding its relationship with PD.
• Longitudinal studies of early-onset ET are needed to determine if it increases PD risk.
• Late-onset ET or ET-plus may represent an early, pre-diagnostic phase of PD.

Conclusions:

• Despite increasing literature suggesting an overlap, the exact relationship between ET and PD remains unclear.
• Further research is required to fully elucidate the connection between these two common neurological conditions.