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Mild cognitive impairment in rapid eye movement sleep behavior disorder and Parkinson's disease

Jean-François Gagnon1, Mélanie Vendette, Ronald B Postuma

  • 1Centre d'étude du Sommeil et des Rythmes Biologiques, Hôpital du Sacré-Coeur de Montréal, Montréal, Québec, Canada. jean-francois.gagnon.5@umontreal.ca

Annals of Neurology
|August 12, 2009
PubMed
Abstract

Insights

Mild cognitive impairment (MCI) is common in idiopathic rapid eye movement sleep behavior disorder (RBD) and Parkinson's disease (PD) with RBD. RBD is a significant risk factor for cognitive decline in these conditions.

Area of Science:

  • Neurology
  • Sleep Medicine
  • Cognitive Neuroscience

Background:

  • Idiopathic rapid eye movement sleep behavior disorder (RBD) and Parkinson's disease (PD) are neurodegenerative conditions.
  • Mild cognitive impairment (MCI) is a potential precursor to dementia.
  • The relationship between RBD and MCI, particularly in the context of PD, requires further investigation.

Purpose of the Study:

  • To determine the prevalence and subtypes of MCI in individuals with idiopathic RBD and PD with RBD.
  • To compare MCI rates between idiopathic RBD, PD with RBD, PD without RBD, and healthy controls.
  • To identify potential cognitive differences associated with RBD in PD.

Main Methods:

  • A comprehensive neuropsychological evaluation was performed on 112 participants.
  • Participants included 32 idiopathic RBD patients, 22 PD patients with polysomnography-confirmed RBD, 18 PD patients without RBD, and 40 healthy controls.
  • MCI was diagnosed using standard criteria, and group comparisons were conducted.

Main Results:

  • MCI was diagnosed in 50% of idiopathic RBD patients and 73% of PD patients with RBD.
  • MCI rates were significantly higher in idiopathic RBD and PD with RBD groups compared to PD without RBD and controls (11% and 8%, respectively).
  • PD patients with RBD showed poorer performance in visuoconstructional and visuoperceptual tasks compared to idiopathic RBD patients.

Conclusions:

  • Rapid eye movement sleep behavior disorder (RBD) is a significant risk factor for mild cognitive impairment (MCI), both in its idiopathic form and when associated with Parkinson's disease (PD).
  • RBD appears to be a key determinant of cognitive impairment in PD, with specific deficits in visuoconstructional and visuoperceptual abilities.

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