OBJECTIVE: To assess the relationship between the presence of REM sleep behavior disorder (RBD) and the cognitive profile of nondemented patients with Parkinson disease (PD). BACKGROUND: Cognitive impairment is an important nonmotor symptom in PD. Waking EEG slowing in nondemented PD has been related to the presence of RBD, a parasomnia affecting brainstem structures and frequently reported in PD. For this reason, RBD may be associated with cognitive impairment in PD. METHODS: Thirty-four patients with PD (18 patients with polysomnographic-confirmed RBD and 16 patients without RBD) and 25 healthy control subjects matched for age and educational level underwent sleep laboratory recordings and a comprehensive neuropsychological assessment. RESULTS: Patients with PD and concomitant RBD showed significantly poorer performance on standardized tests measuring episodic verbal memory, executive functions, as well as visuospatial and visuoperceptual processing compared to both patients with PD without RBD and control subjects. Patients with PD without RBD had no detectable cognitive impairment compared to controls. CONCLUSIONS: This study shows that cognitive impairment in nondemented patients with Parkinson disease (PD) is closely related to the presence of REM sleep behavior disorder, a sleep disturbance that was not controlled for in previous studies assessing cognitive deficits in PD.
OBJECTIVE: To assess the relationship between the presence of REM sleep behavior disorder (RBD) and the cognitive profile of nondemented patients with Parkinson disease (PD). BACKGROUND:Cognitive impairment is an important nonmotor symptom in PD. Waking EEG slowing in nondemented PD has been related to the presence of RBD, a parasomnia affecting brainstem structures and frequently reported in PD. For this reason, RBD may be associated with cognitive impairment in PD. METHODS: Thirty-four patients with PD (18 patients with polysomnographic-confirmed RBD and 16 patients without RBD) and 25 healthy control subjects matched for age and educational level underwent sleep laboratory recordings and a comprehensive neuropsychological assessment. RESULTS:Patients with PD and concomitant RBD showed significantly poorer performance on standardized tests measuring episodic verbal memory, executive functions, as well as visuospatial and visuoperceptual processing compared to both patients with PD without RBD and control subjects. Patients with PD without RBD had no detectable cognitive impairment compared to controls. CONCLUSIONS: This study shows that cognitive impairment in nondemented patients with Parkinson disease (PD) is closely related to the presence of REM sleep behavior disorder, a sleep disturbance that was not controlled for in previous studies assessing cognitive deficits in PD.
Authors: Irene Litvan; Jennifer G Goldman; Alexander I Tröster; Ben A Schmand; Daniel Weintraub; Ronald C Petersen; Brit Mollenhauer; Charles H Adler; Karen Marder; Caroline H Williams-Gray; Dag Aarsland; Jaime Kulisevsky; Maria C Rodriguez-Oroz; David J Burn; Roger A Barker; Murat Emre Journal: Mov Disord Date: 2012-01-24 Impact factor: 10.338
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Authors: Ariel B Neikrug; Julie A Avanzino; Lianqi Liu; Jeanne E Maglione; Loki Natarajan; Jody Corey-Bloom; Barton W Palmer; Jose S Loredo; Sonia Ancoli-Israel Journal: Sleep Med Date: 2014-05-10 Impact factor: 3.492
Authors: Raffaele Nardone; Jürgen Bergmann; Francesco Brigo; Monica Christova; Alexander Kunz; Martin Seidl; Frediano Tezzon; Eugen Trinka; Stefan Golaszewski Journal: J Neural Transm (Vienna) Date: 2012-08-19 Impact factor: 3.575