Soyoung Youn1, Tae Kim2, In-Young Yoon3, Jahyun Jeong1, Hye Young Kim4, Ji Won Han1, Jong-Min Kim5, Ki Woong Kim6. 1. Department of Neuropsychiatry, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea. 2. Department of Neuropsychiatry, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea Department of Psychiatry, Kyung Hee University Hospital at Gangdong, Seoul, Korea. 3. Department of Neuropsychiatry, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea Department of Psychiatry, Seoul National University College of Medicine, Seoul, Korea. 4. Department of Psychiatry, Seoul National University College of Medicine, Seoul, Korea. 5. Department of Neurology, Seoul National University College of Medicine, Seoul, Korea. 6. Department of Neuropsychiatry, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea Department of Psychiatry, Seoul National University College of Medicine, Seoul, Korea Department of Brain and Cognitive Science, Seoul National University College of Natural Sciences, Seoul, Korea.
Abstract
BACKGROUND: Idiopathic REM (rapid eye movement) sleep behaviour disorder (iRBD) has been implicated in cognitive impairments, but there is little evidence about progression of cognitive dysfunction in iRBD. METHODS: A retrospective follow-up study with patients with iRBD was performed. Conversion to neurodegenerative disorders was analysed by Kaplan-Meier survival analysis. Neuropsychological test results at baseline were compared between patients with iRBD and healthy controls. 57 patients with iRBD were successfully followed up for changes of cognitive performance over time (follow-up duration 50.84±25.38 months; range 12-108 months). Factors affecting cognitive decline were evaluated with multiple regression analysis and the subgroup analysis for groups with and without conversion was carried out. RESULTS: Among 84 patients with iRBD, conversion occurred in 18 patients and conversion rates were estimated to be 9%, 18% and 35% at 3, 5 and 6 years from diagnosis of iRBD. Individuals with iRBD showed lower z-scores at baseline than controls in Mini-Mental Status Examination, Trail Making Test A, constructional praxis and Executive Clock Drawing Task (CLOX2). Patients with non-converting iRBD showed significant performance decline in memory (p=0.003, Digit span forward) and a worsening tendency of executive functions (p=0.007, frontal assessment battery; p=0.012, Stroop test) at follow-up tests. Cognitive decline was associated with disease duration or follow-up duration, and lower executive function at baseline increased conversion risk (p=0.031). CONCLUSIONS: Patients with iRBD have cognitive impairments at baseline and progressive cognitive decline over time. Even in idiopathic cases without development of any neurodegenerative disease, degenerative changes in cognition seem to be under way. Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/
BACKGROUND:Idiopathic REM (rapid eye movement) sleep behaviour disorder (iRBD) has been implicated in cognitive impairments, but there is little evidence about progression of cognitive dysfunction in iRBD. METHODS: A retrospective follow-up study with patients with iRBD was performed. Conversion to neurodegenerative disorders was analysed by Kaplan-Meier survival analysis. Neuropsychological test results at baseline were compared between patients with iRBD and healthy controls. 57 patients with iRBD were successfully followed up for changes of cognitive performance over time (follow-up duration 50.84±25.38 months; range 12-108 months). Factors affecting cognitive decline were evaluated with multiple regression analysis and the subgroup analysis for groups with and without conversion was carried out. RESULTS: Among 84 patients with iRBD, conversion occurred in 18 patients and conversion rates were estimated to be 9%, 18% and 35% at 3, 5 and 6 years from diagnosis of iRBD. Individuals with iRBD showed lower z-scores at baseline than controls in Mini-Mental Status Examination, Trail Making Test A, constructional praxis and Executive Clock Drawing Task (CLOX2). Patients with non-converting iRBD showed significant performance decline in memory (p=0.003, Digit span forward) and a worsening tendency of executive functions (p=0.007, frontal assessment battery; p=0.012, Stroop test) at follow-up tests. Cognitive decline was associated with disease duration or follow-up duration, and lower executive function at baseline increased conversion risk (p=0.031). CONCLUSIONS:Patients with iRBD have cognitive impairments at baseline and progressive cognitive decline over time. Even in idiopathic cases without development of any neurodegenerative disease, degenerative changes in cognition seem to be under way. Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/
Authors: Ryan Van Patten; Zanjbeel Mahmood; Delaney Pickell; Jacqueline E Maye; Scott Roesch; Elizabeth W Twamley; J Vincent Filoteo; Dawn M Schiehser Journal: Arch Clin Neuropsychol Date: 2022-01-17 Impact factor: 3.448
Authors: Rezzak Yilmaz; Susanne Gräber; Benjamin Roeben; Ulrike Suenkel; Anna-Katharina von Thaler; Sebastian Heinzel; Florian G Metzger; Gerhard W Eschweiler; Walter Maetzler; Daniela Berg; Inga Liepelt-Scarfone Journal: Front Aging Neurosci Date: 2016-11-15 Impact factor: 5.750