J Korean Geriatr Psychiatry.  2013 Jun;17(1):20-25.

Association between Cognitive Subdomains and Extrapyramidal Signs in Alzheimer Disease: A Clinical Research Center for Dementia of South Korea (CREDOS) Study

Affiliations
  • 1Department of Psychiatry, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea. paulkim@skku.edu
  • 2Center for Clinical Research, Samsung Biomedical Research Institute, Seoul, Korea.
  • 3Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
  • 4Department of Psychiatry, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
  • 5Department of Neurology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
  • 6Department of Neurology, Konkuk University School of Medicine, Seoul, Korea.
  • 7Department of Neurology, Inha University School of Medicine, Incheon, Korea.
  • 8Department of Neurology, Seoul National University College of Medicine, Seoul, Korea.

Abstract


OBJECTIVES
We aimed to investigate the prevalence of Extrapyramidal signs (EPS) and the associations between EPS and cognitive subdomains in patients with Alzheimer disease (AD).
METHODS
We recruited 1,324 patients with AD from the Clinical Research of Dementia of South Korea (CREDOS), a hospital based cohort study with fifty-six participating hospitals. We estimated cognitive subdomain using the Seoul Neuropsychological Screening Battery-Dementia version (SNSB-D). Dementia severity was measured by Clinical Dementia Rating Sum of Boxes (CDR-SB) and Korean version of Mini-Mental Status Examination (K-MMSE). The EPS group was defined by the presence of at least one EPS based on a focused neurologic examination.
RESULTS
The prevalence of patients with EPS was 11%. These had higher CDR-SB scores than non-EPS group. After controlling for demographic, radiological, and dementia severity (CDR-SB) factors, EPS group showed lower cognitive ability in the subdomains for visuospatial and frontal-executive function than non-EPS group. The patients with EPS were showed significantly higher scores in the subdomain for memory function.
CONCLUSION
The presence of EPSs in patients with AD was associated with lower visuospatial, frontal-executive function and higher memory function.

Keyword

Alzheimer disease; Extrapyramidal signs; Cognitive symptoms
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