ArticleFrontiers in aging neuroscience2023
Sequential change in olfaction and (non) motor symptoms: the difference between anosmia and non-anosmia in Parkinson's disease.
Article in Frontiers in aging neuroscience, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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Who cites it
2 citing papers in PubMed, 1 citations in OpenAlex.
- Thioredoxin-1 in the SNpc Regulates Subventricular Zone Neural Proliferation and Olfactory Bulb Neural Differentiation in MPTP-Induced Olfactory Dysfunction.Neurochemical research · 2026Article
- Olfactory impairment and probable REM sleep behavior disorder in Parkinson's disease: clinical relevance to the single- and dual-hit hypotheses.Frontiers in aging neuroscience · 2026Article
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Authors and funding
3 authors at 2 institutions in 1 country.
Funding
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Abstract
Introduction: Hyposmia is a common prodrome in patients with Parkinson's disease (PD). This study investigates whether olfactory changes in PD differ according to the degree of olfactory dysfunction and whether there are changes in motor and non-motor symptoms. Methods: The 129 subjects with PD were divided into two groups: anosmia and non-anosmia. All cases were reassessed within 1-3 years after the initial assessment. The assessment included the MDS-Unified PD Rating Scale (MDS-UPDRS), the University of Pennsylvania Smell Identification Test (UPSIT), Beck's Depression Inventory-II (BDI-II), Montreal Cognitive Assessment (MoCA), and equivalence dose of daily levodopa (LEDD). The generalized estimating equation (GEE) model with an exchangeable correlation structure was used to analyze the change in baseline and follow-up tracking and the disparity in change between these two groups. Results: The anosmia group was older and had a longer disease duration than the non-anosmia group. There was a significant decrease in UPSIT after follow-up in the non-anosmia group (β = -3.62, Discussion: In conclusion, this study found that olfactory sensation may still regress in PD with a shorter disease course without anosmia, but it remains stable in the anosmia group. Such a decline in olfaction may not be related to cognitive status but may be associated with motor progression.
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