Cognitive performance in REM sleep behaviour disorder: a possible early marker of neurodegenerative disease?

Michele Terzaghi, Elena Sinforiani, Chiara Zucchella, Elena Zambrelli, Chiara Pasotti, Valter Rustioni, Raffaele Manni

Research output: Contribution to journalArticlepeer-review

Abstract

Background: Rapid eye movement [REM] sleep behaviour disorder (RBD) may herald neurodegenerative diseases. Neurobiological deficits similar to those identified in neurodegenerative diseases have been reported in idiopathic RBD. Researchers are looking for early markers supporting a possible role of RBD as a harbinger of impending neurodegenerative disease. Objective: To examine the neuropsychological functions in idiopathic RBD subjects. Should they be found to present a neuropsychological dysfunction that overlaps that reported in neurodegenerative diseases, it would be possible to consider cognitive deficits as possible early markers of an underlying degenerative process. Methods: Twenty-three subjects with idiopathic RBD (21 males, mean age 67.0 ± 7.0 years) and a group of healthy controls matched for sex, age and education underwent a neuropsychological battery evaluating different cognitive domains. Findings: Considering mean values, poorer performances were observed in the Word Span (p <.001), Rey-Osterrieth's complex figure recall (p = .003), Digit Span (p = .003) and Logic Memory (p = .003) tests. On the basis of equivalent scores, the RBD subjects performed significantly more poorly on tests of visuo-constructional learning abilities (p <.001). Interpretation: Our data show the possible presence of cognitive deficits in RBD defined as idiopathic, sharing common features in particular with Lewy body disease. Neuropsychological evaluation in RBD could lead to presymptomatic identification of neurodegenerative disease, but until more prolonged long-term follow-up data are available, the true neurobiological significance of cognitive deficits in RBD will remain unknown.

Original languageEnglish
Pages (from-to)343-351
Number of pages9
JournalSleep Medicine
Volume9
Issue number4
DOIs
Publication statusPublished - May 2008

Keywords

  • Early markers
  • Idiopathic REM sleep behaviour disorder
  • Lewy body disease
  • Neuropsychological performances
  • Parkinson's disease

ASJC Scopus subject areas

  • Dentistry(all)
  • Ophthalmology
  • Pulmonary and Respiratory Medicine
  • Neurology

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