Korean Journal of Radiology

The Korean Society of Radiology (대한영상의학회)
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Differences in Regional Glucose Metabolism of the Brain Measured with F-18-FDG-PET in Patients with Essential Tremor According to Their Response to Beta-Blockers

  • Song, In-Uk (Department of Neurology, College of Medicine, The Catholic University of Korea) ;
  • Ha, Sang-Won (Department of Neurology, Veterans Hospital, Seoul Medical Center) ;
  • Yang, Young-Soon (Department of Neurology, Veterans Hospital, Seoul Medical Center) ;
  • Chung, Yong-An (Department of Radiology, College of Medicine, The Catholic University of Korea)
  • Received : 2014.12.30
  • Accepted : 2015.06.24
  • Published : 2015.09.01
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Abstract

Objective: In this study, there was an investigation as to whether there is a functional difference in essential tremor (ET), according to responses to beta-blockers, by evaluating regional changes in cerebral glucose metabolism. Materials and Methods: Seventeen male patients with ET were recruited and categorized into two groups: 8 that responded to medical therapy (group A); and 9 that did not respond to medical therapy (group B). Eleven age-sex matched healthy control male subjects were also included in this study. All subjects underwent F-18 fluorodeoxyglucose (FDG)-PET, and evaluated for their severity of tremor symptoms, which were measured as a score on the Fahn-Tolosa-Marin tremor rating scale (FTM). The FDG-PET images were analyzed using a statistical parametric mapping program. Results: The mean FTM score 6 months after the initiation of propranolol therapy was significantly lower in group A (18.13 > 8.13), compared with group B (14.67 = 14.67). The glucose metabolism in group A in the left basal ganglia was seen to be decreased, compared with group B. The ET showed a more significantly decreased glucose metabolism in both the fronto-temporo-occipital lobes, precuneus of right parietal lobe, and both cerebellums compared with the healthy controls. Conclusion: Essential tremor is caused by electrophysiological disturbances within the cortical-cerebellar networks and degenerative process of the cerebellum. Furthermore, ET may have different pathophysiologies in terms of the origin of disease according to the response to first-line therapy.

Keywords

References

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