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P.087 The influence of disease lateralization in Parkinson’s Disease on tractography in DBS patients

  • E Leck (a1), M Schmidt (a1), H Rigby (a1) and L Weise (a1)

Abstract

Background: Asymmetric motor symptoms are typical in Parkinson’s disease (PD), with potential implications on disease course. Imaging modalities have demonstrated asymmetry, including thinning of motor-related cortex in the contralateral hemisphere of symptomatic side. The objective is to assess correlation between lateralized symptoms and Diffusion Tensor Imaging (DTI) characteristics of pyramidal tract. Methods: 34 PD patients and 30 controls were evaluated. Disease dominance was assessed using UDPRS III. DTI was performed with 60-directional 3Tesla MRI protocol. A 1cm3 subcortical region of interest was positioned underneath motor cortex. Primary outcome was the difference in fibers between disease-dominant and non disease-dominant cortex. Results: There was a significantly higher number of fibers in the hemisphere corresponding to disease dominance (p=0.0031). The same was true for seed number (p=0.0032) and fractional anisotropy (p=0.0427). Based on 23 patients operated on, the threshold for stimulation-induced side effects on the left side was inversely correlated with number of fibers in left ROI (Spearman -0.497, p=0.0158). Conclusions: Based on current literature we expected a reduction of fibers in the contralateral hemisphere to symptom dominant side. Surprisingly, DTI analysis showed an inverse correlation. The underlying pathophysiology remains unclear with the possibility of a compensatory mechanism or compacting of fibers underneath a shrinking motor cortex.

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P.087 The influence of disease lateralization in Parkinson’s Disease on tractography in DBS patients

  • E Leck (a1), M Schmidt (a1), H Rigby (a1) and L Weise (a1)

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