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Lateralized microstructural changes in early-stage Parkinson's disease in anterior olfactory structures, but not in substantia nigra.

Abstract：

:Parkinson's disease (PD) is a progressive neurological disorder characterized by motor symptoms as well as severe deficits in olfactory function and microstructural changes in olfactory brain regions. Because of the evidence of asymmetric neuropathological features in early-stage PD, we examined whether lateralized microstructural changes occur in olfactory brain regions and the substantia nigra in a group of early-stage PD patients. Using diffusion tensor imaging (DTI) and the University of Pennsylvania Smell Identification Test (UPSIT), we assessed 24 early-stage PD patients (Hoehn and Yahr stage 1 or 2) and 26 healthy controls (HC). We used DTI and a region of interest (ROI) approach to study the microstructure of the left and right anterior olfactory structures (AOS; comprising the olfactory bulbs and anterior end of the olfactory tracts) and the substantia nigra (SN). PD patients had reduced UPSIT scores relative to HC and showed increased mean diffusivity (MD) in the SN, with no lateralized differences. Significant group differences in fractional anisotropy (FA) and MD were seen in the AOS, but these differences were restricted to the right side and were not associated with the primary side of motor symptoms amongst PD patients. No associations were observed between lateralized motor impairment and lateralized microstructural changes in AOS. Impaired olfaction and microstructural changes in AOS are useful for early identification of PD but asymmetries in AOS microstructure seem unrelated to the laterality of PD motor symptoms.

journal_name

J Neurol

journal_title

Journal of neurology

authors

Joshi N,Rolheiser TM,Fisk JD,McKelvey JR,Schoffer K,Phillips G,Armstrong M,Khan MN,Leslie RA,Rusak B,Robertson HA,Good KP

doi

10.1007/s00415-017-8555-3

subject

Has Abstract

pub_date

2017-07-01 00:00:00

pages

1497-1505

issue

7

eissn

0340-5354

issn

1432-1459

pii

10.1007/s00415-017-8555-3

journal_volume

264

pub_type

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