Abstract
Background
Hyposmia is a common nonmotor symptom of Parkinson’s disease (PD) and reportedly associated with dysautonomia in PD. The smell identification test for measuring olfactory function consists of multiple items to discriminate specific scents. In the present study, factor analysis of the smell identification test was performed, and the correlation of extracted factors with cardiac sympathetic denervation (CSD) in patients with PD was investigated.
Methods
The present study included 183 early PD patients who underwent the Cross-Cultural Smell Identification Test (CC-SIT) and 123I-meta-iodobenzylguanidine (123I-MIBG) myocardial scintigraphy. Factor analysis of 12 items on the CC-SIT was performed using the computed correlation matrix for the binary items, and five smell factors were extracted. Multiple linear regression was performed to determine the correlation of olfactory function with late heart-to-mediastinum (H/M) ratio of 123I-MIBG uptake.
Results
The mean CC-SIT score was 6.1 ± 2.6, and 133 patients (72.7%) had CSD. The CC-SIT score and five smell factors were not associated with dopamine transporter uptake or cognitive functions. However, the CC-SIT score significantly correlated with age (P < 0.001) and late H/M ratio (P < 0.001). Factors 1 and 5 showed an increasing trend with larger H/M ratio, although it was not statistically significant (β = 0.203, P = 0.085 and β = 0.230, P = 0.085, respectively). Factor 5 significantly correlated with the H/M ratio in PD patients with CSD (β = 0.676, P = 0.036).
Discussion
The results showed olfactory dysfunction to be selectively associated with cardiac sympathetic burden in PD. The correlation of certain factors with CSD indicates the possibility of selective hyposmia in PD patients.
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Data availability
The data supporting the findings of this study are available from the corresponding author upon reasonable request.
Abbreviations
- CC-SIT:
-
Cross-cultural smell identification test
- CDR:
-
Clinical dementia rating
- CSD:
-
Cardiac sympathetic denervation
- 18F-FP-CIT:
-
18F-N-(3-fluoropropyl)-2beta-carbon ethoxy-3beta-(4-iodophenyl) nortropane
- H/M:
-
Heart-to-mediastinum
- H&Y:
-
Hoehn and Yahr Scale
- 123I-MIBG:
-
123I-meta-iodobenzylguanidine
- MMSE:
-
Mini-mental state examination
- PET:
-
Positron emission tomography
- PD:
-
Parkinson’s disease
- ROI:
-
Regions of interest
- SNSB:
-
Seoul neuropsychological screening battery
- SUVR:
-
Standardized uptake value ratio
- UPDRS:
-
Unified Parkinson’s Disease Rating Scale
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Funding
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (NRF-2017R1D1A1B06028086). This research was also supported by the Korea “National Institute of Health” research project (2021-ER1008-02).
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Conceptualization: DWR, JSK. Methodology: DWR, JSK. Formal analysis and investigation: DWR, SWY, KEC, YSO, JSK. Writing—original draft preparation: DWR. Writing—review and editing: SWY, KEC, YSO, JSK. Funding acquisition: JSK. Resources: DWR, JSK. Approval of final manuscript: DWR, SWY, KEC, YSO, JSK.
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Ryu, DW., Yoo, SW., Choi, KE. et al. Correlation of olfactory function factors with cardiac sympathetic denervation in Parkinson’s disease. J Neurol 271, 1397–1407 (2024). https://doi.org/10.1007/s00415-023-12080-8
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DOI: https://doi.org/10.1007/s00415-023-12080-8