Imaging essential tremor

Ioannis U. Isaias, Giorgio Marotta, Shigeki Hirano, Margherita Canesi, Riccardo Benti, Andrea Righini, Chengke Tang, Roberto Cilia, Gianni Pezzoli, David Eidelberg, Angelo Antonini

Research output: Contribution to journalArticlepeer-review

Abstract

To investigate over time changes in striatal dopamine transporter (DAT), we performed two sequential N-ω-fluoropropyl-2β-carbomethoxy-3β- (4-iodophenyl) tropane single photon computed tomography (SPECT) scans in 20 subjects with essential tremor (ET), in 13 with Parkinson disease (PD) and in 23 healthy controls (HC, one scan only). We also performed an [ 99mTc]ethyl cysteinate dimer bicisate SPECT exam for regional brain network analysis in 9 ET, in a second group of 18 PD (9 with tremor, tPD and 9 akinetic-rigid dominant, arPD) and in 8 HC. PD subjects had a reduced DAT binding in comparison to ET and HC with an annual decline rate of 7.3% in the contralateral putamen. There were no mean uptake differences between ET and HC at baseline and no uptake loss over time in ET. A discriminant analysis grouped 30% (first scan) and 5% (second scan) of ET as PD and a partition analysis showed overlap between ET and PD for caudate nucleus uptake. Spatial covariance analysis revealed that the expression of the PD-related regional pattern separated both tPD and arPD from ET and HC. In conclusion, PD and ET do not share a common pattern of dopaminergic loss over time. However, mild impairment of dopamine transporter in the caudate nucleus may contribute to tremor onset in ET.

Original languageEnglish
Pages (from-to)679-686
Number of pages8
JournalMovement Disorders
Volume25
Issue number6
DOIs
Publication statusPublished - Apr 30 2010

Keywords

  • Essential tremor
  • SPECT

ASJC Scopus subject areas

  • Clinical Neurology
  • Neurology

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