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Time-course of decline in different cognitive domains in Parkinson’s disease: a retrospective study

  • Neurology and Preclinical Neurological Studies - Original Article
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Abstract

Cognitive impairment and dementia are common non-motor symptoms in Parkinson’s disease (PD). To elucidate the potentially typical progression of cognitive decline in PD and its variation, we retrospectively surveyed neuropsychological data obtained at the Parkinson-Klinik Ortenau, Germany in the years 1996–2015. Many of the patients in the surveyed period were repeatedly admitted to our clinic and we were thus able to compile neuropsychological re-test data for 252 patients obtained at varying time intervals. Neuropsychological testing was conducted with the NAI (Nürnberger Alters-Inventar). This battery provides sub-tests that examine cognitive processing speed, executive function, working memory, and verbal/visual memory functions. The re-test time span varied across patients from below 1 year up to about 12 years. Most patients were seen twice, but some patients were tested up to eight times. The steepest rates of cognitive decline were observed for the NAI sub-tests Trail-Making, Maze Test, and Stroop-Word Reading/Color Naming. Intermediate rates of decline were found for Digit Span, Word List—Immediate Recall, and Picture Test. Stroop Test—Interference, Word List—Delayed Recognition, and Figure Test exhibited the slowest decline rates. We did not observe a significant effect of age at diagnosis or gender on the rate of decline. In sum, this study retrospectively evaluated cognitive decline in a sample of patients with PD. Our data suggest a broad cognitive decline that particularly affects the cognitive capacities for processing speed, executive functions, and immediate memory functions.

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Abbreviations

AD:

Alzheimer’s disease

DLB:

Dementia with Lewy bodies

MCI:

Mild cognitive impairment

PD:

Parkinson’s disease

PDD:

Parkinson’s disease dementia

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Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Authors and Affiliations

Authors

Contributions

CFA and WHJ designed and conceptualized the study. CFA, KT, and DE performed data collection and analysis. CFA wrote the first draft of the manuscript; KT, DE, and WHJ made substantial contributions to the writing and editing of the final draft. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Christian F. Altmann.

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Conflict of interest

WHJ is advisor and speaker for Abbvie, Bial, Desitin, Stada, UCB, and Zambon. CFA, KT, and DE declare that they have no conflict of interest.

Ethics approval

All procedures were in accordance with the ethical guidelines laid down in the Declaration of Helsinki, 1964, and approved by the ethics committee of the State Medical Chamber of Baden-Württemberg, Germany (F-2021-080).

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Altmann, C.F., Trubelja, K., Emmans, D. et al. Time-course of decline in different cognitive domains in Parkinson’s disease: a retrospective study. J Neural Transm 129, 1179–1187 (2022). https://doi.org/10.1007/s00702-021-02441-w

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  • DOI: https://doi.org/10.1007/s00702-021-02441-w

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