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ISSN (Print): 1567-2050
ISSN (Online): 1875-5828

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Research Article

Predicting Neuropsychiatric Symptoms of Parkinson’s Disease with Measures of Striatal Dopaminergic Deficiency

Author(s): Ram Bishnoi*, Marina C. Badir, Sandarsh Surya and Nagy A. Youssef

Volume 18, Issue 6, 2021

Published on: 27 August, 2021

Page: [499 - 504] Pages: 6

DOI: 10.2174/1567205018666210827122133

Price: $65

Abstract

Background: The role of nigrostriatal dopaminergic neurons degeneration is well established in the pathophysiology of Parkinson’s disease. However, it is unclear if and how the degeneration of the dopamine pathways affects the manifestation of the neuropsychiatric symptoms (NPS) of Parkinson’s Disease (PD). Dopamine transporter (DAT) imaging, a technique to measure the reduction in dopamine transporters is increasingly used as a tool in the diagnosis of PD.

Methods: In this study, we examine if the baseline dopamine transporter density in the striatum measured by the Striatal Binding Ratio (SBR) is associated with the longitudinal onset and/or progression of NPS in PD as measured by part 1 of Movement Disorder Society - Unified Parkinson's Disease Rating Scale, over four years. Data of patients with PD and an abnormal screening present on 123I-ioflupane single-proton emission computed tomography were obtained from Parkinson's Progression Markers Initiative (PPMI) database. Latent Growth Modeling (LGM), a statistical technique that can model the change over time while considering the variability in the rate of change at the individual level, was used to examine the progression of NPS over time.

Results: The results indicate the SBR did not correlate with the baseline NPS but did correlate with the rate of change of NPS (p<0.001) over the next four years, even after eliminating age-related variance, which can be a significant confounding factor.

Conclusion: In conclusion, this study showed gradual worsening in NPS in patients with Parkinson’s disease, which inversely correlates with the density of the dopamine transporters as measured by SBR at baseline.

Keywords: Neuropsychiatric symptoms, Parkinson's disease, dopamine, striatum, neuroimaging, latent growth modeling.

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