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Article type: Research Article
Authors: Gasca-Salas, Carmen; | Estanga, Ainara; | Clavero, Pedro | Aguilar-Palacio, Isabel | González-Redondo, Rafael; | Obeso, Jose A.; | Rodríguez-Oroz, Maria C.;
Affiliations: Neurosciences Area, CIMA, Department of Neurology and Neurosurgery, Clínica Universidad de Navarra, University of Navarra, Pamplona, Spain | Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain | Department of Neurology and Neuroscience, University Hospital Donostia, BioDonostia Research Institute, San Sebastian, Spain | Departamento de Microbiología, Medicina Preventiva y Salud Pública, Facultad de Medicina, Universidad de Zaragoza, Zaragoza, Spain
Note: [] Division of Neurology, Morton and Gloria Shulman Movement Disorders Center, Toronto Western Hospital, University of Toronto, Toronto, ON, Canada.
Note: [] Department of Neurology, Complejo Hospitalario de Navarra, Pamplona, Spain.
Note: [] Department of Neurology, Dr Horacio E. Oduber Hospital, Oranjestad, Aruba.
Note: [] Department of Neurology and Neuroscience, University Hospital Donostia, BioDonostia Research Institute, San Sebastian; Ikerbasque, Basque Foundation for Science, Bilbao, Spain. Correspondence to: María C. Rodríguez-Oroz, Department of Neurology, University Hospital Donostia, and Neuroscience Unit, BioDonostia Research Institute, San Sebastian 20014, Ikerbasque, Basque Foundation for Science, Bilbao, Spain. Tel.: +34 943006012; Fax: +34 943006250; E-mail: [email protected]
Abstract: Background: Dementia and mild cognitive impairment (MCI) are frequent in Parkinson's disease (PD). Deficits in some cognitive tests are considered risk factors for dementia in PD. However, how cognitive deficits progress in aged and long-lasting non-demented PD is not known. Objective: To study the rate and pattern of progression of cognitive deficits in aged and long-lasting non-demented PD. Methods: Forty-nine non-demented patients (23 cognitively normal (PD-CN) and 26 with MCI (PD-MCI)) were studied over 31 months using individual tests and z-scores covering five cognitive domains. All patients were at least 60 year old and have had PD ≥ 10 years. Results: Attention, executive function and memory worsened in 5 PD-CN patients who progressed to MCI (21.7% of the sample) and in 1 patient who became demented (4.3% of the sample). Eleven PD-MCI patients who developed dementia (42.3% of the sample) showed aggravation of visuospatial, executive and attention domains. Multidomain-MCI and poor execution of Stroop-Words, copy of intersecting pentagons and Raven Progressive Matrices tests were associated with conversion to dementia. Conclusions: This pilot study shows that in long-lasting PD 21.7% of PD-CN patients progress to MCI and 42.3% of PD-MCI progress to dementia over a 31 months observation period. The transition from cognitively normal to MCI is featured by attention, executive and memory dysfunction and the evolution from MCI to dementia is marked by the appearance of visuospatial deficits and worsening of attention and executive function. These data are compatible with the concept that cognitive decline in PD follows a distinct dysfunction pattern with progressive anterior to posterior cortical involvement.
Keywords: Mild cognitive impairment, dementia, Parkinson's disease, progression
DOI: 10.3233/JPD-140398
Journal: Journal of Parkinson's Disease, vol. 4, no. 4, pp. 677-686, 2014
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