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Sleep Disorders and Cognitive Dysfunctions in Parkinson’s Disease: A Meta-Analytic Study

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Abstract

A relationship between sleep disorders and cognitive dysfunctions was reported in Parkinson’s Disease (PD), however, some studies did not confirm the link. A meta-analytic study was performed to investigate the relationship between sleep disorders and cognitive dysfunctions, and to clarify the evolution of cognitive status in PD patients with sleep disorders.

The systematic literature search was performed up to November 2020 using PubMed, Scopus, and PsycINFO databases. We included studies published in peer-reviewed journals in English providing results about neuropsychological comparison between patients with or without sleep disorders. Meta-analysis on cross-sectional data included 54 studies for REM Sleep Behavior Disorder (RBD), 22 for Excessive Daytime Sleepiness (EDS), 7 for Obstructive Sleep Apnea (OSA), 13 for Restless Legs Syndrome (RLS), and 5 for insomnia, the meta-analysis on longitudinal data included 7 studies.

RBD was related to deficits of global cognitive functioning, memory, executive functions, attention/working memory, language, and visuospatial abilities. EDS was associated with deficits of global cognitive functioning and attention and working memory abilities, whereas RLS and OSA were related to global cognitive dysfunction. Moreover, we revealed that PD patients with RBD and those with EDS performed worse than PD patients without sleep disorders at follow-up rather than baseline evaluation. Our results suggest that sleep disorders are associated with cognitive deficits supporting indirectly that these, especially the REM Sleep Behavior Disorder, reflect abnormalities of frontal networks and posterior cortical areas. Sleep disorders in patients with PD seem to also increase the risk for long-term cognitive decline.

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Authors and Affiliations

  1. Department of Psychology, University of Campania “Luigi Vanvitelli”, Caserta, Italy

    Gianpaolo Maggi, Luigi Trojano & Gabriella Santangelo

  2. Centre for Neurodegenerative Disease-CEMAND, University of Salerno, Salerno, Italy

    Paolo Barone

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  1. Gianpaolo Maggi
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  2. Luigi Trojano
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  3. Paolo Barone
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  4. Gabriella Santangelo
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Correspondence to Gabriella Santangelo.

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Maggi, G., Trojano, L., Barone, P. et al. Sleep Disorders and Cognitive Dysfunctions in Parkinson’s Disease: A Meta-Analytic Study. Neuropsychol Rev 31, 643–682 (2021). https://doi.org/10.1007/s11065-020-09473-1

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