Essential Tremor Slide Library Version All Contents Copyright © WE MOVE 2001 Essential Tremor and Parkinson’s Disease Part 5 of 7

ET: Overlap with PD ET and PD are among the most common movement disorders ET is considered the most prevalent movement disorder in the U.S. ET/PD: Pathophysiological relationship not established 2% to 19% of ET patients report parkinsonism

ET: Overlap with PD 10% of ET patients have a positive family history of PD PD more common in ET and kindreds than otherwise expected: Geraghty and Jankovic (1985). Lang (1986). Koller (1994). ET patient may develop striatonigral deficiency: Lee (1999). Farrer et al. (1999).

ET and PD: Epidemiologic Investigations Possible association: –Hornabrook and Nagurney (1976) –Jankovic and Geraghty (1985) –Jankovic et al. (1995)

PD and ET

PD and ET

Tremor Due to PD and ET